JPH0729204B2 - Gas metal arc enclosed welding equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a gas metal arc enclosed welding in which a rod-shaped material to be welded such as a reinforcing bar is vertically erected or is horizontally sealed and gas-sealed. More particularly, the present invention relates to a gas metal arc enclosure welding device in which a welding jig is divided into a metal and a shield cap.

[Prior Art] In a conventional gas metal arc enclosed welding apparatus, a metal plate formed by an integral block having a groove width larger than a predetermined groove width is provided at both ends of a rebar as a material to be welded, A pair of clampers fixed to both ends thereof is configured to be fastened and fixed to the end portions of the rebar (Jitsuko Sho 63-27917, Sho Kai 63-170095). As a result, the rebar is arranged with a predetermined groove space provided between the joint surfaces, and a metal is arranged on the back side of the groove space so that the weld metal formed by the arc is arranged in the groove space. It has become.

Further, conventionally, a shield gas spouting member is provided at the tip of the dowel to spout the shield gas directly toward the groove space, or a shield gas supply port is provided at a portion near the rebar of the dowel to supply this gas. The groove space is gas-sealed by supplying a shielding gas from the mouth to the groove space (JP-A-59).
-153581).

[Problems to be Solved by the Invention] However, in the conventional welding device, since the metal mold is formed by a large integrated block, when the portion of the inner surface facing the groove space is damaged by an arc or the like. To do this, the entire block needs to be scrapped. Therefore, there is a drawback that the cost for exchanging the money is extremely high.

Further, since the gas sealing means of the conventional device directly injects the shield gas toward the groove space, the gas in the high-speed turbulent state flows into the groove. When attempting to shield by using such a gas flow in a high-speed turbulent state, it is necessary to sufficiently prevent the entrapment of outside air into the groove space.
For this reason, conventionally, it has been attempted to prevent the intake of outside air by disposing sealing materials at both ends of the metal jig. However, since the reinforcing bar is a steel bar with a different diameter, various rib patterns are present on the surface thereof. Further, the height of the ribs also varies depending on the diameter of the steel bar and the like, so it is extremely complicated to prepare the sealing material so as to be applicable to all rib patterns.

Furthermore, when the shield gas supply port is in the immediate vicinity of the material to be welded in the money, in addition to the supply port being blocked due to the filling of the weld metal and not exhibiting its original function, in an extreme case, An accident occurs in which the weld metal flows into the supply port and the dowel jig is fixed to the rebar.

The present invention has been made in view of such problems,
An object of the present invention is to provide a gas metal arc enclosed welding device which can reliably seal the groove space with low consumables cost.

[Means for Solving the Problem] A gas metal enclosure welding apparatus according to the present invention is a rod-shaped 1 which is arranged with a predetermined groove space provided between its joint surfaces.
A metal plate surrounding both ends of a pair of materials to be welded, a shield cap which is engaged with the metal plate and surrounds the entire periphery of both ends of the material to be welded together with the metal plate, and the shield cap. An opening formed to insert the welding contact tip therethrough and a plurality of openings formed on at least two pairs of facing surfaces of the opening apart from each other in the welding contact tip insertion direction so as to discharge the shield gas in a direction in which they collide with each other. It is characterized by having individual gas discharge ports and a rectifying member that is arranged in the gas discharge ports and rectifies the gas to be discharged.

[Operation] In the present invention, the metal is applied to the groove space between the materials to be welded and their joint ends, and the shield cap is connected to the metal with the material to be welded in between. As a result, the end portion and the groove space of the material to be welded are surrounded and bent by the metal member and the shield cap. Then, the welding contact tip is inserted into the groove space through the opening provided in the shield cap to form an arc, the welding metal is placed in the groove space, and the materials to be welded are joined. In this case, the shield gas is discharged through the gas discharge port formed on the opposite end surface of the opening to form a counter flow of the shield gas at the opening. In this case, since the gas discharge port is provided with the rectifying member, the discharge flow is rectified. At least two pairs of the gas discharge ports are formed in the insertion direction of the welding contact tip, and the shield gas flows are discharged from each pair of discharge ports so as to face each other. , The two are united and change course. As a result, after the collision, an outward flow toward the outside and an inward flow toward the groove space are formed. In this way, the opposing flows collide with each other in the opening and become a rectified state with less turbulence, and a part of the rectified flow goes to the groove space. As a result, the groove space is shielded from the atmosphere by the shield gas, and the gas is reliably sealed. When the metal is damaged by the arc, only the metal is replaced, and the cost is significantly reduced.

[Embodiment] An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a front view showing the appearance of a welding apparatus according to an embodiment of the present invention, FIG. 2 is a front sectional view showing the inside of the welding apparatus, FIG. 3 is a side sectional view thereof, and FIG. It is also the plane sectional view.

In this embodiment, as shown in FIG. 2, the reinforcing bars 10 are horizontally arranged and welded to each other. As shown in FIG. 3, the dowel 1 has a U-shaped longitudinal section, and its inner surface is curved with a diameter slightly larger than that of the reinforcing bar 10 to be welded. A shield cap 2 having a U-shaped vertical cross section is mounted on the dowel 1 with its foot placed on the upper end of the dowel 1.

The metal 1 and the shield cap 2 are connected and fixed to each other by a fixing member 3. Also, the prize 1
Clampers 4 are fixed to both ends of the reinforcing bar 10 in the longitudinal direction of the reinforcing bar 10.
The dowel 1 is fixed to the pair of reinforcing bars 10 by tightening the opposite ends of.

Hereinafter, each component will be described in more detail. First,
The metal 1 is, for example, a block made of copper, and its inner surface is curved to have a diameter slightly larger than the diameter of the reinforcing bar 10 so as to follow the outer surface of the reinforcing bar. Therefore, the damper 1 and the rebar by the clamper 4
When 10 and 10 are fixed, a slight gap is formed between the peripheral surface of the reinforcing bar 10 and the inner surface of the metal plate 1. This prize 1 is the second
As shown in the figure, the backing plate 1a at the center of the reinforcing bar 10 in the longitudinal direction
And a pair of heat radiating metal members 1b mechanically engaged with both ends of the back metal member 1a in the longitudinal direction. And this back deposit 1a
Since the inner diameter of the heat radiating member 1b is slightly different from that of the heat radiating member 1b, a band-shaped shallow groove 11 is formed at the center of the inner surface of the member 1 in the longitudinal direction of the reinforcing bar. A backing material 30 is arranged in the groove 11. As shown in FIG. 7, this backing material 30 is made of a fire resistant flexible member 31 such as ceramic fiber and a conductive member 32 superposed on each other.

The shield cap 2 has a rebar 10 at the center of its top plate.
A rectangular opening 12 having a short side in the longitudinal direction and a long side in the direction orthogonal to the longitudinal direction of the reinforcing bar 10 is formed. Rectangular gas discharge ports 13 and 14 extending along the long sides are formed at the pair of long side facing end surfaces of the opening 12. The gas discharge port 13 is arranged farther from the center of the reinforcing bar 10 (outer side) than the gas discharge port 14.

Further, gas introducing paths 15 and 16 are provided inside the shield cap 2, the gas introducing path 15 communicates with the gas discharge port 13 through a large number of holes, and the gas introducing path 16 has a large number of holes. Through the gas discharge port 14. And each gas outlet 13,1
There are rectifying members 17 and 18 in the gas discharge port 1 and the gas discharge port 1
It is designed to rectify the gas discharged from 3,14.

The shield cap 2 and the metal 1 are formed as separate bodies, and a welding jig that surrounds both joint ends of the reinforcing bar 10 is formed by stacking both end surfaces of the shield cap 2 and the metal 1. Each tip surface 2a, 1 with which the shield cap 2 and the dowel 1 contact each other
As shown in FIG. 5, a step 28 is provided at a. The end surface 2a of the shield cap 2 has an outer substantially half portion projecting toward the abutment metal 1 with the step 28 as a boundary, and the end surface 1a of the abutment metal 1 projects toward an inner substantially half half shield cap 2. Then, by connecting the shield cap 2 and the dowel 1 by fitting the steps 28 into each other, the steps 28 block the passage of gas.

As shown in FIG. 6, the end surface of the shield cap 2
A gasket 29 may be interposed between the 2a and the end surface 1a of the dowel 1 to seal the space between the shield cap 2 and the dowel 1.

The connecting arm 20 of the fixing member 3 is fixed to the front surface and the rear surface of the shield cap 2 with bolts 21. The connecting arm 20 has a T-shaped flat plate shape, and a horizontally extending portion is fixed to the shield cap 2 by a pair of bolts 21, and a downwardly extending portion extends to the dowel 1.
It is designed to be stacked on the front and back of the prize 1.
On the other hand, a fitting member that extends horizontally is provided on the front surface and the back surface of the dowel 1.
22 is fixed at both ends by bolts 23. Further, the central portion of the fitting member 22 is configured so that the downward extending portion of the connecting arm 20 can be inserted, and the butterfly bolt 24 is screwed into the approximate center of the fitting member 22. ing. Then, by screwing the wing bolt 24 with the downward extending portion of the connecting arm 20 inserted in the central portion of the fitting member 22,
The downwardly extending portion is tightened between the butterfly bolt 24 and the metal plate 1 to fix the connecting arm 20 to the fitting member 22. As a result, the shield cap 2 and the dowel 1 are connected and fixed.

The clampers 4 are both side surfaces of the dowel 1 (end faces in the longitudinal direction of the reinforcing bar 10).
It is fixed to. Each clamper 4 is composed of a pair of half-divided bodies 25 obtained by dividing a circular ring into two parts, which are rotatably connected to each other by a fulcrum 26, and one half-divided body 25 is fixed to the dowel 1. There is. Then, when both ends of the half body 25 are butted, a circular ring surrounding the reinforcing bar 10 is formed. Both ends are fixed to each other by tightening the nut 27, and the half body 25
Is fixed by sandwiching the rebar 10.

Next, the operation of the welding device configured as described above will be described. For example, as shown in FIG. 2, the horizontal reinforcing bars 10 are arranged such that their joint surfaces are separated by a predetermined groove gap,
The dowel 1 is applied to both joint ends of each rebar 10 from below. In this case, a backing material 30 (see FIG. 7) is arranged in the groove 11 of the metal die 1. Then, the rotating half body 25 of the clamper 4 is rotated to fit the rebar 10, and the nut 27 is tightened to fix the half bodies 25 by sandwiching the rebar 10 therebetween. As a result, the dowel 1 is fixed to both ends of the reinforcing bar 10. The flexible member 31 of the backing material 30 is the reinforcing bar 10 and the metal 1
Even when the reinforcing bar 10 is deformed by being pinched between the reinforcing bar 10 and the peripheral surface of the reinforcing bar 10, the reinforcing bar 10 and the dowel 1 are reliably sealed.

Next, the shield cap 2 is placed on the dowel 1 by inserting the downward extending portion of the connecting arm 20 into the central portion of the fitting member 22. Then, by tightening the butterfly bolt 24, the connecting arm 20 and the fitting member 22 are fixed, and as a result, the shield cap 2 is fixed to the dowel 1. This makes the rebar 10
A welding jig that surrounds both joint ends and the groove space is configured.

Next, the shield gas is supplied to the discharge ports 13 and 14 via the gas introduction paths 15 and 16, respectively, and the shield gas is discharged from the discharge ports 13 and 14 toward the opening 12. Then, as shown in FIG. 7, the shield gas is rectified by the rectifying members 17 and 18 and then becomes a horizontal flow to be discharged into the opening 12. Since the shield gas flows are discharged from the pair of discharge ports 13 and 14 so as to face each other, after colliding in the opening 12, the two merge to change the course. The shield gas flows discharged from the discharge port 13 provided on the outer side of the shield cap 2 collide with each other, and then become an outward flow 33 and an opening portion.
From 12 heads outward. On the other hand, after the shield gas flows discharged from the discharge port 14 provided inside the shield cap 2 collide with each other, they are in a rectified state with less turbulence and become an inward flow 34 toward the groove space. The outward flow 33 prevents outside air from entering the groove space through the opening 12. After entering the groove space, the inward flow 34 flows through the gap between the reinforcing bar 10 and the metal die 1 in a direction away from the groove space in the longitudinal direction of the reinforcing bar 10, and enters the groove space through this gap. Cut off incoming outside air. In this way, the groove space is reliably sealed by the shield gas.

After that, after electrically connecting the ground terminal of the welding power source and the reinforcing bar 10, the welding wire supported by the welding torch is opened.
Insert into groove space via 12. Then, an arc is formed by supplying a predetermined electric power to the welding wire through a contact tip electrically connected to the welding wire. In this case, since the conductive member 32 of the backing material 30 connected to the reinforcing bar 10 is arranged in the groove space, a stable and good arc is formed between the welding wire and the conductive member 32. It is caused. Then, while moving the arc by semi-weaving or the like, the weld metal is put in the groove space and the groove space is filled with the molten metal. Then stop the arc,
After the weld metal is cooled and solidified, the wing bolt 24 is loosened and the shield cap 2 is removed. After that, the nut 27 is loosened to release the clamper 4 from the reinforcing bar 10, and the dowel 1 is removed from the reinforcing bar 10 to finish the welding. The conductive member 32 melts to form a swell and becomes a part of the joint.

In this embodiment, the welding jig is divided into the metal plate 1 and the shield cap 2, which are connected and fixed by the wing bolts 24 at the time of welding work so that the reinforcing bar 10 is surrounded. Therefore, when the damage is caused by the arc, it is sufficient to replace only the metal die 1 which is disposed on the back side of the groove space and is easily damaged by the arc. Further, the dowel 1 should be disassembled into a back dowel 1a which is disposed on the back side of the backing material 30 facing the groove space and is the most worn, and a heat radiating dowel 1b provided on both sides thereof. Because you can do it, even if you have one back
Only 1a needs to be replaced. Therefore, the cost of consumables can be significantly reduced.

Moreover, this dowel 1 has a simple shape, and the introduction paths 15 and 16 and the discharge port 1 provided in the shield cap 2 are provided.
No need to drill holes such as 3,14. Also, when the dowel 1 is formed as an integral block, the backing material accommodating groove 11 of the dowel 1 only changes the processing surface radius in the groove forming area when processing the inner surface of the dowel 1. Since it can be formed by, the processing of the groove 11 is extremely simple. Therefore, the manufacturing cost of the prize 1 is low. Therefore, in this embodiment, the cost of consumables in the welding operation can be significantly reduced.

Further, since the step 28 is formed on the end face connecting the metal 1 and the shield cap 2, the good sealing property is secured even if the side wind is received.

Of course, the present invention is not limited to the above embodiment. For example, the present invention is not limited to the case of the horizontal line as in the embodiment shown in FIG. 7, but the present invention is also applied to the case of the diagonal line of the I-shaped groove or the vertical line of the I-shaped groove in which the joint surface is inclined. can do.

[Effects of the Invention] According to the present invention as described above, the jig and the shield cap are formed as separate bodies, and a jig for surrounding the groove space is configured by connecting these during welding work,
In the case of being damaged by the arc, it is configured such that only the metal which can be easily processed is replaced, so that the consumable cost can be remarkably reduced.

[Brief description of drawings]

FIG. 1 is a front view showing the external appearance of an apparatus according to an embodiment of the present invention, and FIG.
FIG. 4 is a front sectional view showing the inside thereof, FIG. 3 is a side sectional view thereof, and FIG. 4 is a plan sectional view thereof.
FIG. 6 is a schematic diagram showing a connection mode between the shield cap and the metal, FIG. 6 is a schematic diagram showing a modification thereof, and FIG. 7 is a front sectional view showing the operation of this embodiment. 1; Grant metal, 1a; Back metal, 1b; Heat dissipation metal, 2; Shield cap, 3; Fixing member, 4; Clamper, 10; Rebar, 12; Opening, 1
3, 14; Shield gas discharge port, 15, 16; Shield gas introduction passage, 17, 18; Rectifying member, 20; Connecting arm, 22; Connecting fitting member, 24; Butterfly bolt

Claims (7)

[Claims] 1. A metal plate which surrounds both ends of a pair of rod-shaped materials to be welded, which are arranged with a predetermined groove space between the joint surfaces, and a metal plate engaged with the metal plate. A shield cap that surrounds the entire circumference of both ends of the material to be welded together with gold, an opening formed in the shield cap for inserting a welding contact tip, and the welding contact tip on a surface facing the opening. A plurality of gas discharge ports formed in at least two pairs separated from each other in the insertion direction and discharging the shield gas in a direction in which they face each other, and a rectifying member arranged in the gas discharge for rectifying the discharged gas, A gas metal arc enclosure welding apparatus, which is characterized by having. 2. The opening has a short side having a width greater than or equal to a width of the groove space plus a size of a contact tip for supplying power to the welding wire, and a length greater than or equal to a maximum diameter of the material to be welded. The gas metal arc enclosure welding device according to claim 1, wherein the gas metal arc enclosure welding device has a rectangular shape formed by a long side. 3. The gas metal arc enclosure welding apparatus according to claim 1, further comprising a sealing means for sealing gas at a contact portion between the shield cap and the metal shell. 4. A connecting arm fixed to the outer surface of either one of the shield cap and the metal plate, and having an insertion portion formed at its tip end extending toward the other shield cap or metal plate. A coupling fitting member fixed to the outer surface of the other side shield cap or metal and fitting the insertion portion, and the coupling arm by screwing into a screw hole of the coupling fitting member and tightening the screw. 2. A gas metal arc enclosure welding apparatus according to claim 1, further comprising a screw member for fixing the insertion portion of the connector to the connecting fitting member. 5. A pair of fixtures, which are fixed to both ends of a material to be welded in the dowel in the longitudinal direction, and are fastened to the ends of the material to be welded to attach the dowel to the material to be welded. The gas metal arc enclosure welding device according to claim 1. 6. The fixture encloses approximately half of the outer periphery of the end of the material to be welded, and encloses a half receiving portion fixed to the metal member and approximately the other half of the end of the material to be welded. The half-rotating part rotatably supported by the half-receiving part, and a screw member for fixing the half-rotating part to the half-receiving part. Gas metal arc enclosure welding equipment. 7. The recess comprises a copper backing metal having a substantially semi-circular curved recess inside, and a pair of heat radiating latches having recesses similar to the curved recess on both sides thereof. The gas metal arc enclosure welding device according to claim 1, wherein the gas metal arc welding equipment is arranged so that its circumferential directions substantially coincide with each other and is mechanically engaged with each other.