JP4906394B2 - Manufacturing method of welding wire - Google Patents

Description

  The present invention relates to a method for manufacturing a welding wire used for arc welding, laser welding, or the like.

  In Japanese Patent Application Laid-Open No. 62-81293 (Patent Document 1), an elongated metal outer sheet metal plate is formed so that a cross section in the width direction of the elongated metal outer sheet metal sheet becomes an arc shape. The manufacturing method of the welding wire which inserts an inclusion wire in the area | region enclosed with the metal plate for work is shown. In this method, in order to maintain the durability of the wire, the seam of the metal shell is joined by welding, brazing or adhesive before drawing. As described above, the welding wire adopting the double structure of the metal outer sheath and the inner wire has the advantage that the directivity of the arc becomes high and the material of the welding alloy can be selected as appropriate.

Japanese Patent Laying-Open No. 2003-103394 (Patent Document 2) discloses a method for manufacturing a welding wire in which an inner wire and a flux are surrounded by a tubular metal shell. More specifically, the elongated metal hull metal plate is formed so that the cross section in the width direction of the elongate metal hull metal plate has an arc shape, and is enclosed in an area surrounded by the arc-shaped metal hull metal plate. A wire and a flux are inserted, and the seam of the metal plate for the metal shell is brought into close contact.
JP-A-62-81293 JP 2003-103394 A

  However, in the manufacturing method shown in Patent Document 1, since the joint of the metal skin is joined by welding, brazing, or an adhesive, the manufacturing is complicated.

  Moreover, in the manufacturing method shown in patent document 2, it was difficult to match | combine the edge part of a metal skin.

  An object of the present invention is to provide a method of manufacturing a welding wire that can bring the outer peripheral surface of the inner wire into close contact with the inner peripheral surface of the metal plate for the metal skin and that can be easily processed into a predetermined wire diameter. .

  In the method for manufacturing a welding wire according to the present invention, first, a long and thin metal plate for a metal hull is formed using one or more rollers so that a cross section in the width direction of the long metal plate for a metal hull becomes an arc shape. Next, the inner wire is inserted into a region surrounded by the arc-shaped metal outer metal plate. Then, a metal skin for forming the metal sheath is formed so that the outer peripheral surface of the inner wire and the inner peripheral surface of the metal shell metal plate are brought into close contact with each other by using one or more rollers, and the inner wire is disposed inside. make. Next, by using a plurality of rollers and / or a plurality of dies, the cross-sectional areas of the metal sheath and the inner wire are reduced stepwise to increase the adhesion between the inner wire and the metal sheath. Thereby, the space | interval dimension of the joint of a metal outer skin is reduced, and it processes to a predetermined | prescribed wire diameter. In the present invention, one or more rollers are used to bring the outer peripheral surface of the inner wire into close contact with the inner peripheral surface of the metal plate for the metal skin, and to reduce the distance between the joints of the metal plate for the metal skin. Since the metal plate for molding is formed, the adhesion between the inner wire and the metal plate for the metal skin and the reduction in the distance between the joints of the metal plate for the metal skin can be reliably performed at the same time. In addition, in order to reduce the cross-sectional area of the metal skin and the inner wire step by step using a plurality of rollers and / or a plurality of dies, and increase the adhesion between the inner wire and the metal skin, the inner wire and the metal plate for the metal skin It is possible to more reliably perform the close contact with.

  In addition, when the metal plate for metal outer skin and the inner wire are subjected to a rolling process or heat treatment, an oxygen-concentrated layer is formed on the surface. The “oxygen-enriched layer” here is a layer having a high concentration of oxygen contained in the metal. In the present invention, it is even better to use a metal skin or an internal wire in which these oxygen-enriched layers exist. That is, the oxygen-enriched layer is formed at a total of three locations including the outer peripheral surface portion of the inner wire, the inner peripheral surface portion of the metal skin, and the outer peripheral surface portion of the metal skin. As a result, these oxygen-enriched layers can sufficiently supply oxygen that contributes to stabilization of arc discharge. Therefore, even if welding using an inert gas (Ar, He, a mixed gas of Ar and He, etc.) or an oxygen source is not supplied into the shielding gas, oxygen is supplied more than necessary into the weld metal. Therefore, it is possible to prevent the increase of non-metallic inclusions made of oxide. Therefore, regardless of the type of material of the inner wire and the metal hull, and even if the inner wire and the metal hull are the same material or a combination of different materials, the impact value of the weld metal is prevented from decreasing, and arc stability Can be increased.

When disposing the powder in the tubular metal shell, first, the elongated metal shell metal plate is formed using one or more rollers so that the cross section in the width direction of the metal plate for the elongated metal shell becomes an arc shape. . Next, 25% by weight or less of the weld metal composition adjusting powder is filled in the region surrounded by the arc-shaped metal hull metal plate, and the powder in the region surrounded by the arc-shaped metal hull metal plate is filled in the region. Insert the inner wire. Then, using one or more rollers, the metal plate for the metal skin is formed so as to reduce the distance between the joints of the metal plate for the metal skin, thereby forming a metal skin in which the inner wire and the powder are arranged. Next, using a plurality of rollers and / or a plurality of dies, the cross-sectional areas of the metal sheath and the inner wire are gradually reduced, and the powder is compressed and processed into a predetermined wire diameter. “Welding metal composition-adjusted powder” as used herein refers to the adjustment of the composition so that the weld metal becomes a desired component when the inner wire and the metal sheath cannot be designed so that the weld metal becomes the target chemical component. Metal powder added for use. For example, powders such as Cr, Mo, Ni, and Fe can be added depending on the application. Such a weld metal composition adjusting powder can be disposed between the outer peripheral surface of the inner wire and the inner peripheral surface of the metal skin in the process of manufacturing the welding wire. If the weld metal composition adjusting powder is arranged, the weld metal can be easily adjusted to a desired composition. In this method, the metal plate for the metal shell is formed using one or more rollers so as to reduce the distance between the seams of the metal plate for the metal shell, and welding is performed using a plurality of rollers and / or a plurality of dies. Since the cross-sectional area of the wire is gradually reduced to increase the density of the powder and process it into a predetermined wire diameter, the adhesion between the encapsulated wire and the powder and the adhesion between the metal plate for the metal skin and the powder are more reliably performed. be able to. When trying to obtain a welding wire with a chemical composition with high functionality but low marketability, it is possible to use a combination of an existing inclusion wire that is highly marketable and inexpensive and a dissimilar metal in the metal sheath, and Ni, Cr By finely adjusting the alloy components using alloy powders such as Mo and Mo, a weld metal having a target chemical composition is obtained by melting them during welding. That is, it is possible to design a component of a welding wire having a chemical composition having high functionality with a high degree of freedom by combining different materials and adding an alloy powder, and further, it is possible to manufacture the welding wire quickly and inexpensively. These high-performance welding wires may be welded using not only inert gas but also a mixture of activated gases such as O ₂ and CO _2, and are also used as filler materials for TIG welding and laser welding. it can.

  The ratio of the cross-sectional area of the inner wire to the cross-sectional area of the welding wire is preferably 2 to 60%. If it does in this way, it will become easy to arrange | position an inclusion wire in the center of a welding wire, and favorable welding workability | operativity can be obtained. If it is less than 2%, the effect of the oxygen-enriched layer is lowered, the arc stability is lowered, or the inner wire is not arranged at the center of the welding wire, and the directivity of the arc is lowered. In addition, if it exceeds 60%, the metal sheath cannot completely wrap the inner wire, and a part of the inner wire is exposed on the surface of the welding wire, and the gap between the joints cannot be kept within a predetermined range. In a welding wire filled with metal powder, the powder may flow out to the outside. Therefore, welding workability is significantly reduced.

  Moreover, it is preferable that the distance between the center point of the welding wire and the center point of the inner wire is less than 35% of the diameter dimension of the welding wire. If it is 35% or more, the directivity of the mark at the time of welding is lowered, and the welding workability is hindered.

  Further, the interval dimension of the overlapping metal skins at the joint of the metal skins is set to 25% or less of the diameter dimension of the welding wire. By setting it to 25% or less, it is not necessary to join the seam by welding or the like.

  Alternatively, the inner wire may be inserted into a metal skin processed into a seamless tubular shape, and the degree of adhesion between the inner wire and the metal skin may be increased by repeating drawing with a die. By doing so, in addition to the fact that the interface between the metal skin and the inner wire is not affected by the outside air, the inner wire is accurately placed at the center of the welding wire.

  In the present invention, one or more rollers are used to bring the outer peripheral surface of the inner wire into close contact with the inner peripheral surface of the metal plate for the metal skin, and to reduce the distance between the joints of the metal plate for the metal skin. Since the metal plate for molding is formed, the adhesion between the inner wire and the metal plate for the metal skin and the reduction in the distance between the joints of the metal plate for the metal skin can be reliably performed at the same time. In addition, in order to reduce the cross-sectional area of the metal skin and the inner wire step by step using a plurality of rollers and / or a plurality of dies, and increase the adhesion between the inner wire and the metal skin, the inner wire and the metal plate for the metal skin It is possible to more reliably perform the close contact with.

  In addition, by optimizing the ratio of the cross-sectional area of the inner wire to the cross-sectional area of the welding wire, the inner wire can be arranged at the center of the welding wire, the directivity of the arc is improved, and good welding workability Is obtained.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 (A) is a conceptual diagram of a manufacturing apparatus for manufacturing a welding wire by the method of the first and second embodiments of the present invention, and FIG. 1 (B) is a manufacturing apparatus shown in FIG. 1 (A). FIG. 2C is a cross-sectional view of a welding wire that does not contain powder corresponding to the process of the manufacturing method of the first embodiment of the present invention, and (C) is the process of the manufacturing method of the second embodiment of the present invention. It is sectional drawing of the welding wire containing the powder corresponding to.

  First, with reference to FIGS. 1A and 1B, a method for manufacturing a wire that does not contain powder (a manufacturing method according to the first embodiment of the present invention) will be described. As shown in FIG. 1 (A), the welding wire manufacturing apparatus has a wire feed coil 203 that feeds the inner wire 201, a metal plate feed coil 207 that feeds the elongated metal shell metal plate 205, and a winding that winds the welding wire 209. A take-up coil 211. The inner wire 201 sent out from the wire sending coil 203 and the metal plate for metal outer shell 205 sent out from the metal plate sending coil 207 join in the middle, and are wound around the winding coil 211 as a welding wire 209. Note that the materials and dimensions of the inner wire 201 and the metal plate 205 for the metal skin are selected so that the ratio of the cross-sectional area of the inner wire to the cross-sectional area of the welding wire obtained in the final process is 2 to 60%. Yes. Between the metal plate sending coil 207 and the winding coil 211, there are a primary forming roll group 213, a hopper 215, a secondary forming roll group 217, a tertiary forming roll group 219, and a roller die 221. And a capstan 223 are arranged. In the manufacturing method of this example, the hopper 215 is not used. First, the thin metal plate 205 for the metal outer skin fed from the metal plate feeding coil 207 is formed by the primary forming roll group 213 so that the cross section in the width direction becomes an arc shape. Next, the inner wire 201 sent out from the wire feed coil 203 is inserted into a region surrounded by the arc-shaped metal outer metal plate 205, and the inner wire 201 and the metal outer metal plate 205 merge. Next, the second forming roll group 217 and the third forming roll group 219 bring the outer peripheral surface of the inner wire 201 and the inner peripheral surface of the metal plate 205 for metal skin into close contact, and align the metal plate 205 for metal outer shell. In order to reduce the distance between the eyes, a metal plate for metal skin 205 is formed, and the outer periphery of the inner wire 201 is surrounded by a tubular metal plate for metal skin (metal skin) 205. Next, drawing is performed by a plurality of roller dies 221. The reduction rate of the cross-sectional area of the wire by the roller die 221, that is, the area reduction rate is preferably 10 to 40%. The capstan 223 is a winder having a driving force, and the wire is drawn by the driving force. Further, by using a roller die or a plurality of dies 227 by the driving force of the winder 211, the cross-sectional areas of the metal outer skin 205 and the inner wire 201 were reduced stepwise, and the gap between the seams of the metal outer skin was reduced. At the same time, the degree of adhesion between the inner wire and the metal skin is increased to a predetermined wire diameter, and then drying is completed. Although the area reduction rate of the cross-sectional area of the wire by the die 227 varies depending on the final wire diameter, 60 to 90% is preferable when the final wire diameter is 1.2 mm which is a standard dimension. Depending on the material, disconnection frequently occurs due to work hardening in the middle of the processing process, so annealing heat treatment may be performed in an intermediate process. In addition, as shown in FIG. 1, a manufacturing process does not necessarily need to be performed by 1 series from the process start to the last wire diameter, and may be performed by dividing | segmenting a manufacturing process suitably.

  Next, with reference to FIGS. 1A and 1C, a method for manufacturing a wire containing powder (a manufacturing method according to the second embodiment of the present invention) will be described. First, the thin metal plate 205 for the metal outer skin fed from the metal plate feeding coil 207 is formed by the primary forming roll group 213 so that the cross section in the width direction becomes an arc shape. Next, the powder 225 is filled from the hopper 215 into a region surrounded by the arc-shaped metal outer metal plate 205. Next, the inner wire 201 sent out from the wire sending coil 203 is inserted into the powder 225 in the region surrounded by the arc-shaped metal outer shell metal plate 205, and the inner wire 201 and the metal outer metal plate 205 are separated. Join. In this example as well, the materials and dimensions of the inner wire 201 and the metal plate 205 for the metal skin are such that the ratio of the cross-sectional area of the inner wire to the cross-sectional area of the welding wire obtained in the final process is 2 to 60%. Is selected. Next, the metal plate 205 for the metal shell is formed by the secondary forming roll group 217 and the third forming roll group 219 so that the distance between the joints of the metal plate 205 for the metal shell is reduced. The outer periphery of the wire 201 is surrounded by a tubular metal plate for metal skin (metal skin) 205. Next, drawing is performed by the roller die 221. Further, the cross-sectional area of the welding wire is reduced stepwise by a roller die or a plurality of dies 227, the powder 225 is densified by pressurization and processed into a predetermined wire diameter, and then completed through drying. Although the area reduction rate of the cross-sectional area of the wire by the die 227 varies depending on the final wire diameter, 60 to 90% is preferable when the final wire diameter is 1.2 mm which is a standard dimension. Depending on the material and the content of the powder 225, disconnection frequently occurs due to work hardening in the middle of processing. Therefore, annealing heat treatment may be performed in an intermediate process. In addition, it is the same as that of the manufacturing method of the wire which does not contain the powder described previously that a manufacturing process can be divided | segmented suitably. In the above example, the roll groups 213 and 217 are set so that the radial directions of the primary forming roll group 213 and the third forming roll group 219 are orthogonal to the radial direction of the secondary forming roll group 217. , 219 are arranged, but the rolls in the roll groups 213, 217, 219 are arranged so that the radial directions of the rolls in the roll groups 213, 217, 219 are different in the direction perpendicular to the direction in which the rolls are arranged. It doesn't matter. The roll groups 213, 217, and 219 rotate following the movement of the metal plate for metal skin 205 and the inner wire 201. Depending on the materials and dimensions of the metal plate for metal skin 205 and the inner wire 201, the rolls You may make it drive by itself.

  Next, with reference to FIG. 2 (A) and (B), the manufacturing method (the manufacturing method of the 3rd Embodiment of this invention) of the welding wire which inserted the inclusion wire in the seamless tubular metal outer shell is demonstrated. To do. As shown in FIG. 2A, the welding wire manufacturing apparatus includes a feed coil 207 that feeds a composite material 231 in which an inner wire 201 is inserted in advance into a seamless tubular metal sheath 229, and a winding coil 211 that winds the welding wire 209. It has. The composite material 231 delivered from the delivery coil 207 is subjected to wire drawing using a die 227 by a capstan 223 having a driving force. By repeating the process, the cross-sectional area of the welding wire is reduced stepwise, the adhesion between the inner wire and the seamless tubular metal shell is increased to a predetermined wire diameter, and then wound on the winder 211. Finish after drying. Depending on the material, disconnection frequently occurs due to work hardening in the middle of the processing process, so annealing heat treatment may be performed in an intermediate process. In addition, as shown in FIG. 2, a manufacturing process does not necessarily need to be performed by 1 series from the process start to the last wire diameter, and may be performed by dividing | segmenting a manufacturing process suitably.

FIG. 3 is a cross-sectional view of an example of a wire that does not contain powder manufactured by the method of the first embodiment. As shown in the figure, the welding wire of this example has an inner wire 1 and a metal outer skin 3. The included wire 1 is a wire made of carbon steel or the like. When the chemical composition of the inner wire is different from the chemical composition of the metal shell, the difference in tensile strength between the inner wire and the metal shell before processing into a welding wire should be within 60 kgf / mm ² in absolute value. This is preferable because the frequency of disconnection in the process is reduced and the production efficiency is increased. An oxygen-enriched layer 1 a is formed on the outer peripheral surface portion of the inner wire 1. The metal shell 3 is made of carbon steel or the like, and has a tubular shape arranged so as to surround the outer periphery of the inner wire 1. The ratio of the cross-sectional area of the inner wire 1 to the cross-sectional area of the entire welding wire is preferably in the range of 2 to 60%. In this example, it is 11.9%. Oxygen-concentrated layers 3 a and 3 b are formed on the inner peripheral surface portion and the outer peripheral surface portion of the metal skin 3, respectively. The metal shell 3 is formed by molding an elongated metal shell metal plate, and has joints 3c and 3d that approach each other. The inner peripheral surface of the metal skin 3 and the outer peripheral surface of the inner wire 1 are in close contact with each other. In addition, the distance between the center point C of the welding wire and the center point G of the inner wire is preferably less than 35%. In this example, it is 17%. Moreover, it is preferable that the space | interval dimension S of the seams 3c and 3d of the metal skin 3 to overlap shall be 25% or less of the diameter dimension D of a welding wire. In this example, it is 11.5%.

  FIG. 5 schematically shows a process in which the inner wire and the metal skin are brought into close contact with each other in the method of the first embodiment. In this welding wire, pressure is applied to the end portion of the metal skin, and plastic working is performed until the end portion has an acute angle, thereby reducing the gap size of the joint. The area reduction rate in the wire drawing process is 60 to 90% at a standard wire diameter of 1.2 mm, and 80% or more at a wire diameter of 0.9 mm.

  In addition, as shown in FIG. 4, the joint of the metal outer skin 3 may extend in the radial direction of the welding wire. Also in this example, the ratio of the cross-sectional area of the inner wire 1 to the cross-sectional area of the entire welding wire is preferably in the range of 2 to 60%, and is 58% in this example. Further, the distance between the center point C of the welding wire and the center of gravity G of the inner wire is 7% of the diameter D of the welding wire. Further, the interval dimension S of the overlapping metal shells 3 at the joints 3c and 3d is 17% of the diameter dimension D of the welding wire.

  FIG. 6 schematically shows a process in which the inner wire and the metal skin are brought into close contact with each other in the welding wire shown in FIG. In this welding wire, plastic working is performed in the radial direction and the longitudinal direction of the wire to reduce the gap size of the seam.

  FIG. 7 is a cross-sectional view of a welding wire containing powder produced by the method of the second embodiment described above. As shown in this figure, the welding wire of this example has the inclusion wire 101, the metal outer skin 103, and the powder 105 which improves the welding effect. In the inner wire 101, an oxygen concentrating layer 101a is formed on the outer peripheral surface portion in the same manner as the inner wire 1 of the first embodiment. In addition, oxygen concentrating layers 103a and 103b are also formed on the inner peripheral surface portion and the outer peripheral surface portion of the metal skin 103, respectively. The powder 105 is disposed between the inner wire 101 and the metal skin 103. This powder 105 is a weld metal composition adjusting powder of 25 wt% or less with respect to the welding wire.

  FIG. 8 is a cross-sectional view of a welding wire in which an inner wire is inserted into a seamless tubular metal shell manufactured by the method of the third embodiment described above. The metal outer shell 303 has a seamless tubular shape and is arranged so as to surround the outer periphery of the inner wire 301. Also in the welding wire of this example, an oxygen enriched layer 301 a is formed on the outer peripheral surface portion of the inner wire 301. In addition, oxygen-enriched layers 303a and 303b are also formed on the inner peripheral surface portion and the outer peripheral surface portion of the metal skin 303, respectively.

Next, as shown in Table 1, the material of the inner wire and the metal hull, the adjustment powder added between the metal hull and the inner wire, the amount added, the deviation of the inner wire (the welding wire relative to the diameter of the welding wire) The distance between the center point of the inner wire and the center of gravity of the inner wire), the distance dimension ratio of the seam (the ratio of the distance dimension of the overlapping metal skin at the seam of the metal skin to the diameter dimension of the welding wire), the cross-sectional area ratio (welding The welding wires of Examples 1 to 9 and Comparative Examples 1 to 3 were manufactured by variously changing the ratio of the cross-sectional area of the inclusion wire to the cross-sectional area of the wire. Moreover, the alloy which is a design target in Table 1 is a weld metal in which the metal sheath and the inner wire are melted and alloyed.

  FIG. 9 is a result of composition analysis from the surface by Auger electron spectroscopy to the inside of about 100 nm in the inner peripheral surface portion of the metal skin of the welding wire of Example 2 described above. From this figure, it can be seen that the surface of the inner peripheral surface of the metal skin has a higher oxygen concentration than the inside.

Next, using the welding wires of Examples 1 to 9 and Comparative Examples 1 to 3, MIG welding was performed in a state shielded with an inert gas, the stability of arc current and voltage, the directivity of the arc, The regularity of droplet transfer, the shape of the weld bead and the welding workability were evaluated. The stability of the arc current and voltage was evaluated by performing bead-on-plate welding with an arc current of 185 A and a voltage of 25 V, and using a measurement result of current and voltage of about 9000 times in about 30 seconds with a high-speed waveform recorder. Under the above welding conditions and measurement conditions, the variation in arc current is 17 A or less in standard deviation, the variation in voltage is 0.7 V or less in standard deviation, the standard deviation in arc current is 17 to 22 A, and the standard deviation in voltage is 0. A value of .7 to 1.0 V was indicated by ◯, a standard deviation of arc current was 22 A or more, and a standard deviation of voltage was 1.0 V or more by Δ. With regard to the directivity of the arc, the arc convergence is good and, as a result, no undercut occurs. The thing was made into (triangle | delta). As for regularity of droplet transfer, the arc during welding is photographed with a high-speed camera, ◎ indicates that the spray is completely sprayed, and ○ indicates that there is almost a mixture of short-circuited transitions, but there are many spray transfers. A case where irregular short-circuit transitions are mixed together at a ratio of Δ is indicated by Δ. With respect to the shape of the weld bead, the ratio of the bead height to the bead width when the smoothness of the bead cross section is evaluated is less than 0.37. .37 or more, or only one of the meandering bead is also to a as a ○ is a bead ratio of height to bead width is 0.37 or more and and and what is meandering bead △. In terms of welding workability, in the evaluation of the above four items, only ◎ and ○ were good, and those with △ were not possible. The weld metal impact value was also determined. Table 2 shows the measurement results.

  From Table 2, the welding wires of Examples 1 to 9 are evaluated by the stability of arc current and arc voltage, arc directivity, regularity of droplet transfer, and weld bead shape even in MIG welding using an inert gas. Good welding workability. In addition, it can be seen that there are few non-metallic inclusions in the weld metal, and the impact value of the weld metal is high for any material. On the other hand, since the welding wires of Comparative Examples 1 to 3 had an inappropriate cross-sectional shape, the arc directivity was lowered in all wires. Thereby, since the bead shape was poor and it was difficult to create a welded joint, the impact value of the weld metal could not be measured.

Next, using the welding wires of Examples 5 to 7, welding is performed with a shielding gas in which O ₂ or CO ₂ is mixed with Ar, and arc current and arc voltage stability, arc directivity, droplet transfer are performed. The regularity, weld bead shape and welding workability were evaluated. Table 3 shows the measurement results.

From Table 3, it can be seen that even when welding is performed in a state where Ar is shielded with a gas containing O ₂ or CO ₂ , arc characteristics are improved and welding workability is improved.

(A) is a conceptual diagram of the manufacturing apparatus which manufactures a welding wire with the method of the 1st and 2nd embodiment of this invention, (B) is the book in the manufacturing apparatus shown to FIG. 1 (A). It is sectional drawing of the welding wire which does not contain the powder corresponding to the process of the manufacturing method of 1st Embodiment of invention, (C) respond | corresponded to the process of the manufacturing method of 2nd Embodiment of this invention It is sectional drawing of the welding wire containing powder. (A) is a conceptual diagram of the manufacturing apparatus which manufactures a welding wire with the method of the 3rd Embodiment of this invention, (B) is the 1st of this invention in the manufacturing apparatus shown to FIG. 2 (A). It is sectional drawing of the welding wire which does not contain the powder corresponding to the process of the manufacturing method of 3 embodiment. It is sectional drawing of the welding wire manufactured in the 1st Embodiment of this invention. It is sectional drawing of the welding wire of the different aspect of the welding wire of FIG. (A)-(E) are the figures which show typically the process of closely_contact | adhering an inclusion wire and a metal outer skin in the welding wire of FIG. (A)-(E) are the figures which show typically the process of closely_contact | adhering an inclusion wire and a metal outer skin in the welding wire of FIG. It is sectional drawing of the welding wire manufactured with the method of the 2nd Embodiment of this invention. It is sectional drawing of the welding wire manufactured with the method of the 3rd Embodiment of this invention. It is a composition analysis result from the surface by the Auger electron spectroscopy in the inner peripheral surface part of the metal skin of the welding wire of Example 2 to the inside of about 100 nm.

Explanation of symbols

1,101 Inner wire 3,103 Metal shell 105 Powder

Claims (1)

In the method of manufacturing a welding wire,
Forming the elongated metal hull metal plate using one or more rollers so that the cross section in the width direction of the elongate metal hull metal plate is arcuate,
Filling the welding metal composition adjusting powder of 25 wt% or less with respect to the welding wire in a region surrounded by the arc-shaped metal plate for the metal shell,
An inner wire is inserted into the powder in a region surrounded by the arc-shaped metal plate for the metal shell, and the interval between the joints of the metal plate for the metal shell is reduced using one or more rollers. , Forming the metal shell for forming the metal shell, and arranging the inner wire and the powder inside the metal shell,
Using a plurality of rollers and / or a plurality of dies, gradually reducing the cross-sectional area of the metal sheath and the inner wire, densifying the powder and processing it to a predetermined wire diameter ,
The ratio of the cross-sectional area of the inclusion wire to the cross-sectional area of the welding wire is 2 to 60%,
The distance between the center point of the welding wire and the center point of the inner wire is less than 35% of the diameter dimension of the welding wire;
A method for manufacturing a welding wire, wherein an interval between overlapping metal skins in a joint of the metal skin is 25% or less of a diameter size of the welding wire.

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