JP3696485B2 - Gas pressure welding burner - Google Patents

Description

[0001]
OBJECT OF THE INVENTION
  The present invention relates to a ring burner used in a gas pressure welding method for concentrically pressing and joining the ends of reinforcing bars, and in particular, a predetermined range including a butt pressure welding portion of a reinforcing bar to be subjected to gas pressure welding and the vicinity thereof. New that can be heated reliablyStructure gas pressure burnerIs to provide.
[0002]
[Prior art]
  Most of the joining of steel bars for reinforced concrete in the civil engineering and construction fields is carried out by the gas pressure welding method, and the gas pressure welding method is generally performed concentrically butting the ends of the reinforcing bars multiple times. While repeating pressurization and depressurization, the joint is heated from the surroundings with a flame of acetylene gas / oxygen mixed gas, and simultaneously welded to join the two steel bars together.
It will be integrated.
[0003]
  In a conventional gas pressure welding method that has been performed conventionally, a ring burner that surrounds the joint in an annular shape is used, and a method in which the pressure welding portion of the reinforcing bar is heated appropriately and uniformly from all directions is adopted. As shown in the perspective view of the conventional ring burner in FIG. 7, the tip end side is branched into a blow pipe attachment port 7 connected to a blow pipe (not shown), and the outer peripheral side of the rebars 8 and 8 subject to gas pressure welding is formed. A gas supply pipe 9 that is curved so as to be surrounded in an arc shape is provided, and cylindrical crater tips 91, 91,... Scattered along the circumferential direction on the inner peripheral surface of the arc-shaped tip side of the gas supply pipe 9. , And the tip of each of the crater tips 91, 91,...
It is arranged in a radial arrangement with the rebars 8 and 8 as the center for gas pressure welding. In the pressure welding operation, the end surfaces of the rebars 8 and 8 for gas pressure welding are coaxially butted against each other with a predetermined pressure. At the same time, a combustion gas is supplied from a blow pipe attachment port 7 connected to a blow pipe (not shown), and gas is emitted from the tip of each crater tip 91, 91,. The joining end faces are heated and pressed while visually confirming the heating state of the reinforcing bars 8 and 8.
[0004]
  In this conventional gas pressure welding operation, the flame from the ring burner crater tips 91, 91,... Is concentrated on the target rebar, but is released from each crater tip 91, 91,. Each of the crater tips 91, 91,... Is entirely thin and perpendicular to the rebar axis. As the surface flame is reflected to the rebar, it follows the gas pressure welding operation standard, `` Each rebar has a width range corresponding to at least the diameter of the rebar from the abutment surface, uniformly and within a certain time, quickly at the rebar center temperature. Heat to about 1200 ° C. "In the ring burner itself, take care not to change the distance from the rebar axis of each crater tip 91, 91, ... (The axial direction) on both sides, and heating continued work with fast parallel movement operation by the width of which corresponds to each at least reinforcing bar diameter, even in the short time of the work,
The joint is surrounded by a reducing flame shield so that partial abnormal heating is prevented and an oxide film is not formed on the joint of the reinforcing bars 8 and 8 to form a flat fracture surface. Difficult work operations are required to maintain optimum conditions, such as having to pay close attention to prevent unnecessary air intrusion.
[0005]
  In order to solve the problem of securing human resources and work efficiency derived from such highly specialized work content, JP-A-7-214343 and JP-A-9-271963 have been proposed as improved techniques related to gas pressure welding. For example, in the former Japanese Laid-Open Patent Publication No. 7-214343, a dressing containing an oxygen scavenger or a dehydrogenating agent is applied to the joint end surface of the steel bar. In the latter Japanese Patent Laid-Open No. 9-271963, a gas pressure welding apparatus that can be controlled to follow a flame is proposed. Has been.
[0006]
  However, any of these conventional ones does not improve the flame condition by improving the ring burner itself. Instead, it is possible to apply a coating agent to the target reinforcing bars or to automate the pressure welding work. Therefore, it is intended to improve the accuracy and efficiency of the pressure welding work that employs the ring burner, and it has not been able to solve the difficulty of increasing the material cost and the equipment cost.
[0007]
  In view of such a situation, the joints of the rebars 8 and 8 to be welded to the gas pressure welding are required without requiring highly accurate skilled techniques as before, or without employing expensive rebar materials or gas pressure welding devices. In addition to being able to heat uniformly and properly, an oxide film is formed by the intrusion of air into the joint part, and flattened surfaces are formed in the pressure welded part and welded part, so that sufficient mechanical strength cannot be secured. As a result of repeated research and trial production of a new gas pressure welding burner that has been deeply interested as one of those who have been involved in this industry for many years, and improved the performance of the part normally called crater tip Although we have reached the completion of a new crater piece that can lead to simplification of pressure welding work and improvement of pressure welding performance, stabilization of the crater piece mounting angle to the gas supply pipe and pressure welding Issues remain in terms of drilling hole drilling accuracy according to the diameter of the reinforcing bars 8, 8, etc., and it does not necessarily increase the production efficiency of various gas pressure welding burners according to the diameter of the reinforcing bar, and the price increases. There has been a risk of inviting.
[0008]
  This invention is based on the above experience, and has begun further development and research toward the practical application of a novel gas pressure welding burner that can ensure good gas pressure welding performance and increase its productivity. After many trials and errors and many trial productions and experiments, it is possible to eliminate these conventional problems.New structure gas pressure welding burnerIn the following, the configuration thereof will be described in detail together with an embodiment representative of the present invention shown in the drawings.
[0009]
[Structure of the invention]
   As clearly understood from the embodiments representing the present invention shown in the drawings, the present inventionGas pressure welding burnerIs basically composed of the following.
    That is,A planar shape that forms a part of the shape surrounding the heating target space at a position away from the heating target space, and provided with a connecting portion on the base end side to which a gas supply pipe can be connected. , With respect to the gas supply path main body formed in a groove portion that is connected from the base end side to the tip end side and is open only on the back side, the tip end side, the base end side, and a predetermined portion in the middle Each crater piece toward the space to be heated is integrally formed from each of the crater pieces, and each crater piece is scraped from the bottom of the groove corresponding to these crater pieces to the middle in the thickness direction of each crater piece. There is a pilot hole part for each part, and from each of these pilot hole parts, a crater through hole is drilled in the thickness direction of the crater piece part and in an optimum angle direction according to the space to be heated. At the same time, a concealing plate is brazed on the back side of the gas supply path main body groove, The ends of a pair of symmetrical gas supply pipes that are connected to the crater mounting port so that a pair of gas pressure crater parts formed using a gas pressure crater base body are formed into a body. Connect to each part via the base end side connection part,
Gas pressure welding burner with a configuration in which the crater pieces are combined so as to face each other across the space to be heatedIt is.
[0010]
  The gas supply channel main body integrally connects the gas supply pipe and the crater piece, and guides and guides the combustion gas supplied through the gas supply pipe to the crater piece, so that the gas supply passage main body is compatible with a separate concealing plate. A planar shape that functions as a main body for realizing a tubular space, and forms a part of a shape surrounding the heating target space at a predetermined distance from the heating target space, In other words, it must be formed in a circular shape, a part of an ellipse close to it, or a planar shape corresponding to a part of a polygon as will be described later in the embodiment, and a gas supply pipe is provided on the base end side. A connecting portion that can be connected is formed and is connected to the distal end side from the base end side, and only the back side is formed in an open groove portion, and the entire gas supply path main body is made of brass or the like. Although it is desirable that the metal material is forged, be sure to It is also not necessarily limited to the molding means, or machining the metal block, or may be assumed by an equal variety of known molding means for producing by casting.
[0011]
  The connecting portion serves to connect the end of the gas supply pipe in an airtight state, and can be formed in a recessed shape that allows the tip of the gas supply pipe to be inserted into a fitting shape. It is possible to form a cylindrical part that can be attached to the outside opening of the gas supply pipe and connect with a screw structure if necessary, and can be brazed, welded, or heat-resistant adhesive or A structure that can be firmly and airtightly bonded and fixed by using a sealing material or the like, and can be formed at the same time when the gas supply path body is press-molded. Alternatively, the machined base end can be cut and finished to provide an interference fit process, and a connection can be made by press-fitting to ensure an airtight structure. Larger outer diameter than wall thickness It may be capable of connecting structure of the gas supply pipe.
[0012]
  The groove portion serves to form a part of the gas supply passage that leads from the gas supply pipe to the crater piece portion inside the gas supply passage main body, and the combustion gas supplied at a predetermined pressure is substantially omitted in each crater piece portion. It must have a pipe shape that can be evenly guided, and has a structure that opens to the back surface of the gas supply path body.For example, the groove section has a cross-sectional shape that gradually increases from the distal end side to the proximal end side of the gas supply path body. In addition to being configured to be enlarged, it may be formed in a substantially uniform groove cross-sectional shape over the entire length, and concealed in advance along the edge of the open portion of the groove. It can be formed by forming a fitting portion for mounting the plate.
[0013]
  The crater piece serves to form a crater through-hole that radiates a flame toward the heating target space in the gas supply channel main body, and is convenient for radiating the flame toward the heating target space. It should be projected and formed in a solid block shape that improves the flow rate, which is convenient for crater piercing holes according to the diameter of the reinforcing bar, and that even gas is supplied to these crater piercing holes. In order to enable supply, it is possible to form the pilot hole part that has been scraped to the middle part in the thickness direction of the crater piece at the same time as forging or casting for molding the gas supply channel main body. It is. It is desirable that the crater piece portion having a solid block shape be formed into a spherical shape, a cylindrical surface shape, or a chamfered shape with the peripheral side corners cut off, and the tip surface shape is preferably a gas supply channel. It is possible to form the main body at the same time as the forging or casting for forming the main body, or to form the main body at the stage of cutting.
[0014]
  The pilot hole portion serves not only to guide the cutting tool for drilling the crater through-holes properly, but also to supply an equal gas to the crater through-holes. In order to ensure the cutting angle of the cutter within a predetermined range, it is desirable to form it into a conical shape with an opening diameter as large as possible. It may be formed in a substantially columnar blind hole shape so as to reduce the cutting size at the time.
[0015]
  The gas pressure welding crater parts are manufactured by cold forging the gas pressure welding crater base, fixed to the cutting machine with any one of its flat surfaces as the reference surface, and the crater through hole from the groove side to the crater piece After the perforation, a concealing plate can be brazed on the open back side of the gas supply passage main body groove, and the crater base for gas pressure welding can be manufactured by casting. It is possible to cut out from a metal block by machining, and further, a concealing plate can be welded or joined with a heat-resistant adhesive. A heat-resistant elastic sealing material can be sandwiched between the opening edge on the back side and crimped, or can be combined using a plurality of screws to ensure a sealed structure.
[0016]
  Prior to integration of the concealment plate, the gas pressure welding crater base is selected at the appropriate position selected from the bottom of the corresponding pilot hole for each crater piece according to the size of the space to be heated determined by the diameter of the reinforcing bar, etc. From the crater piece thickness direction, one or a plurality of crater through holes must be drilled at an optimum angle appropriately selected so that the space to be heated is heated uniformly.
[0017]
  The gas pressure welding burner connects a gas pressure welding crater base to each of the distal ends of a pair of symmetrical gas supply pipes connected so as to branch to a crater mounting port via a proximal end side connecting portion. The crater piece portions are configured to be arranged so as to face each other across the space to be heated, and any part of the outer peripheral wall surface of the crater attachment port is formed into a planar shape, When connecting the gas supply pipe and the gas pressure welding crater base together, the flat shape of the crater mounting port and the gas pressure welding crater base is positioned so that they are arranged in parallel or on the same plane. In addition to the fixed and integrated structure, each joint part can be meshed and brazed in a joined state, and a jig that accurately regulates each placement is used. , Each part was temporarily fixed Connection status, may be of structure that is integrally brazed.
  In the following, embodiments that represent the present invention shown in the drawings will be described in detail so that the above configuration becomes clearer.
[0018]
[Example 1]
  1 is a perspective view of the gas pressure welding burner of FIG. 1, a plan view of the gas pressure welding burner of FIG. 2, a cross sectional view of the crater part for gas pressure welding of FIG. 3, a cross sectional view taken along line AA in FIG. The example shown in the BB cross-sectional view of FIG. 3 is manufactured using a gas pressure welding crater part formed by cold forging, and formed into a structure capable of mass production. A typical embodiment of a gas pressure welding burner having the basic configuration of the present invention is shown.
[0019]
  The gas pressure welding burner 1 has a symmetrical shape in which a pair of gas pressure welding crater parts 2 and 2 formed by using gas pressure welding crater bases 2 and 2 are connected to a crater mounting port 7 so as to branch. The tip portions of the pair of gas supply pipes 9 and 9 are connected to each other through the base end side connection portions 3 and 3, and the crater piece portions 4, 4... Face each other across the heating target space 8. It is set as the structure combined so that it may become arrangement | positioning.
[0020]
  The crater base 2 for gas pressure welding has a brass rod or block substantially in a planar shape so as to form a part of a shape surrounding the heating target space 8 at a position spaced from the heating target space 8 by a predetermined distance (around 20 mm). Cold-forged, and the base end side is formed with a concave-shaped connecting portion 3 capable of connecting the tip of the gas supply pipe 9 whose outer diameter is slightly larger than the wall thickness in a fitting manner. A groove portion 5 that opens to the back side is formed inside the wall thickness from the end side to the tip side, and a step-like fitting for fitting the concealing plate 6 to the opening edge portion of the groove portion 5 As shown in FIGS. 4 and 5, a plurality of crater pieces 4, 4,... Project from the wall surface corresponding to the heating target space 8 from the distal end side to the proximal end side. In addition, within the thickness of the crater piece parts 4, 4,... Frame portions 4, up to the thickness direction the middle of the ...... each 剔Ri up,
A pilot hole 41, 41,... For each crater piece 4 is formed as a gas supply path main body 21.
[0021]
  The front end surface of each crater piece portion 4, 4,... Facing the heating target space 8 is formed in a cylindrical shape, and the crater piece portions 4, 4 disposed near the middle of the middle portion of the gas pressure welding crater base 2 5 are formed in a shape protruding in the planar thickness direction of the gas pressure welding crater base 2 and are substantially perpendicular to the axial center of the cylindrical heating target space 8 shown in FIG. The crater through-holes 42, 42,... That are inclined at an optimum inclination angle in a wide angle range of 0 to 30 degrees with respect to the center chain line arrow are formed into a shape that can be drilled.
[0022]
  Using the outer plane shape of the gas pressure welding crater base 2 obtained by forging, positioning and fixing to the cutting machine are performed, and the diameter 0.8-1. The crater through holes 42, 42,... Around 7 mm are drilled at an optimum position and angle to produce the gas pressure welding crater part 2 shown in FIG. A concealing plate 6 that can be fitted in a hermetically sealed manner is mounted, the joint between the fitting portion 51 and the concealing plate 6 is brazed and joined in an airtight manner, the groove 5 is sealed in a pipe shape, and gas pressure welding The crater part 2 is formed.
[0023]
  A pair of two gas pressure welding crater parts 2, 2 formed in this way are connected in a branched manner to a blow pipe attachment port 7 made of brass, through base end side connection parts 3, 3. A pair of gas pressure welding crater parts 2 and 2 which are joined to the respective ends of the gas supply pipes 9 and face each other with the heating target space 8 interposed therebetween are arranged so that the outer wall surfaces of the respective planar shapes are substantially in the same plane. Are positioned and combined. In addition, as shown in the perspective view of another embodiment of the gas pressure welding burner in FIG. 6, the gas pressure welding crater bases 2 and 2 are formed by forging.
Outside that can be cut out by cutting a metal rectangular block,
It is also possible to use what was manufactured by casting.
[0024]
[Action]
  The gas pressure welding crater base 2 of the present invention having the configuration as described above has almost the outer shape of the gas supply path main body 21 including the internal structure such as the groove portion 5 and the pilot hole portions 41, 41,... By cold forging. It can be formed by press molding once or several times, and the base end side connecting portion 3 can be formed in the same molding process by devising the mold structure, and in the subsequent cutting process, it is molded by forging. Positioning and fixing can be performed by using the planar wall shape thus formed, and mounting on a jig is also possible.
[0025]
  The gas pressure welding crater part 2 can be positioned and fixed using the planar shape of the gas pressure welding crater base 2 and the pilot holes 41, 41,. If a dedicated jig is used, it is possible to drill the crater through-holes 42, 42,... At an accurate position at an optimum angle in a quick operation, and to cut the crater opening. Thus, it becomes possible to finish the inner diameter of the crater through holes 42, 42,... With high accuracy. Further, after piercing through holes 42, 42,... Are drilled through the groove portion 5 on the back side of the gas pressure welding crater base 2, a band-shaped brass plate is applied to the fitting portion 51 formed at the opening edge of the groove portion 5. When the bent concealment plate 6 is fitted in a fitting shape and brazed to form a sealed shape, the groove 5 forms a gas supply conduit.
[0026]
  Next, the two gas pressure welding crater parts 2 and 2 are arranged so as to face each other at a predetermined interval across the heating target space 8, and the respective planar outer wall surfaces are in the same plane. To the tip of each of the pair of gas supply pipes 9 and 9 connected in a bifurcated shape to the blowing pipe attachment port 7, and joined in a fitting manner via the connection parts 3 and 3. The crater through holes 42, 42,... Are symmetrically arranged with high accuracy across the heating target space 8.
[0027]
  The gas pressure welding burner 1 manufactured in this way freely drills crater through-holes 42, 42,... At optimum positions according to the outer diameter of the reinforcing bars 8, 8 to be gas pressure welded. It is possible to manufacture a gas pressure welding burner 1 having various nozzle structures using a single type of gas pressure welding crater base 2, 2, as shown in FIGS. 1 to 3. In addition, a flame can be radiated from the periphery of the space to be heated 8 without unevenness, and as shown by a chain line arrow in FIG. 5, the flame is radiated toward a range having a predetermined width, and the gas pressure welding burner 1 is almost It is possible to perform heating in the optimum range without moving.
[0028]
  Further, the thickness dimensions of the gas pressure welding crater bases 2 and 2 are set to be smaller than the outer diameter dimensions of the gas supply pipes 9 and 9, and the crater pieces 4, 4,. Since the structure protrudes from the thickness of the gas pressure welding crater component 2 so that the holes 42, 42,... Are arranged on the outside, the rebars subject to gas pressure welding from between the crater pieces 4, 4,. The pressure welding work can be performed while visually confirming the joint portions of 8 and 8, and therefore the pressure welding work is accurate and easy.
[0029]
【effect】
  As described above, according to the crater base for gas pressure welding of the present invention, the gas supply path main body at the previous stage where the through hole for the crater is machined is formed into a flat shape, and the machine tool is utilized using the flat shape. Because it is easy to position and fix accurately and quickly, and it is possible to drill the crater through hole with the optimum angle at the correct position according to the outer diameter size of the gas pressure welding target rebar to be heated, The quality during mass production can be improved and stabilized, and the crater can be constructed by scraping from the bottom of the groove to the middle of each crater piece in the thickness direction and forming a pilot hole for each crater piece. When machining through holes for machining, pilot holes are no longer needed, reducing the number of machining steps and greatly improving the efficiency of manufacturing operations. Forging using molds and casting using molds The excellent structure for mass production can be easily obtained. Feature in which is obtained.
[0030]
  Further, according to the crater part for gas pressure welding of the present invention, the through hole for the crater can be drilled in the optimum direction through the groove portion opened on the back side, and a plurality of crater pieces having different angles per one crater piece portion It is also possible to drill and process the crater through holes at predetermined intervals, and by forming various crater structures, it is possible to deal with gas reinforcement welding target rebars of various outer diameters. After drilling each through hole for the crater, if the concealing plate is fitted to the pre-formed fitting portion along the edge of the open portion of the groove portion, the groove portion is closed. The complicated gas supply path can be easily formed, and the great effect that the gas supply pipe can be easily and accurately connected to the connection part formed in advance on the base end side of the gas pressure welding crater base. Also has.
[0031]
  Furthermore, according to the gas pressure welding burner of the present invention, each of the pair of gas pressure welding crater parts formed in a flat shape is accurately arranged on the same plane at a position spaced a predetermined distance from the space to be heated. Since it can be a fixed structure, it can surround the entire circumference of the rebar joint subject to gas pressure welding uniformly with flame, and can be heated evenly and optimally,
If the ring burner has a conventional structure, it requires a translation operation that requires a high level of skill, but it does not require such advanced technology and can realize good gas pressure welding work. The gas pressure welding crater parts formed in the above can be easily visually checked the state of the joints of the reinforcing bars subject to gas pressure welding without stopping the heating operation, so it is stable without relying on intuition. The thin gas pressure welding crater component realizes the above-described work, and also has the effect of facilitating the inflow of air from the back side to the crater side and improving the combustion efficiency and the cooling efficiency.
[0032]
  In particular, in the gas pressure welding burner 1 described in the embodiment, in addition to the above-described features, most of the shape of the gas pressure welding crater base 2 is formed with high accuracy by one or several cold forgings. Therefore, in the subsequent cutting process, it is only necessary to drill the crater through-holes 42, 42,..., And the planar part formed by forging is also used as a reference surface for positioning the parts during the process. In addition to having an optimum structure for increasing production efficiency in mass production, the tip surface shape of the crater piece 4, 4,... , 42,... Are drilled at optimum angles, respectively, and the crater opening position does not fluctuate greatly at any angle, and the distance from each crater to the rebars 8, 8 subject to gas pressure welding It is kept almost constant, depending on the outer diameter of the reinforcing bars 8,8 Hole 42, also by changing the machining conditions of an angle or arrangement of ..., flame from the optimum position is to have the advantage that the structure is emitted.
[0033]
  Further, each of the crater through holes 42, 42,... Can be drilled at an optimum angle with respect to each of the crater pieces 4, 4,. There are adjacent crater pieces 4, 4, 4 formed so as to protrude from the thickness of the crater part 2 for gas pressure welding, and the crater through holes 42, 42, 42 are arranged differently. In addition to the structure, the plurality of crater through holes 42, 42,... Can be perforated along the width direction of each crater piece 4, 4, 4. A very practical effect that a plurality of types of gas pressure welding burners 1 can be produced from the gas pressure welding crater base 2 formed by the same mold is exhibited.
[0034]
  As described above, the gas pressure welding crater base of the present invention, the gas pressure welding crater component using the same, and the gas pressure welding burner using the same make it possible to achieve the intended purpose evenly by the novel configuration. This enables high-precision processing and assembly, is easy to manufacture, can be made much more economical than the conventional unit price of a ring burner, and reduces manufacturing costs. And shortening the time required for manufacturing can be reliably achieved,
Stable product supply is assured, and since advanced technology is not required for gas pressure welding work, the work efficiency itself can be greatly increased, reducing costs and working time significantly. It is difficult to secure skilled workers, and it is highly evaluated in the construction or construction industry where reduction of various expenses is strongly demanded, and it will be widely used and spread. Expected to be.
[Brief description of the drawings]
  The drawings show several typical embodiments embodying the technical idea of the gas pressure welding crater base of the present invention, the gas pressure welding crater component using the same, and the gas pressure welding burner using the same. It shows a conventional technique for comparison.
FIG. 1 is a perspective view showing a structure of a gas pressure welding burner.
FIG. 2 is a plan view showing the structure of a gas pressure welding burner.
FIG. 3 is a cross-sectional view showing an assembly structure of a crater part for gas pressure welding.
4 is a cross-sectional view showing the structure of the AA line portion in FIG. 2. FIG.
FIG. 5 is a cross-sectional view showing the structure of the BB line portion in FIG. 3;
FIG. 6 is a perspective view showing another structure of a gas pressure welding burner.
FIG. 7 is a perspective view showing the structure of a conventional ring burner.
[Explanation of symbols]
      1 Gas pressure welding burner
      2 Gas pressure welding crater base (gas pressure welding crater parts)
        21 Same gas supply channel
      3 Base side connection
      4 Tinder piece
        41 Same pilot hole
        42 The same crater through hole
      5 groove
        51 Same fitting part
      6 Concealment board
      7 Blow pipe attachment port
      8 Rebars subject to gas pressure welding (space to be heated)
      9 Gas supply pipe
        91 Tinder tip

Claims (2)

A planar shape forming a part of a shape surrounding the heating target space at a position spaced from the heating target space, and provided with a connection portion on the proximal end side to which a gas supply pipe can be connected , With respect to the gas supply path main body formed in a groove portion that is communicated from the base end side to the tip end side and only the back side is open, the tip end side, the base end side, and a predetermined number of intermediate portions Each crater piece toward the space to be heated is integrally formed from each of the crater pieces, and each crater piece is scraped from the bottom of the groove corresponding to the crater piece to the middle of each crater piece in the thickness direction. There is a pilot hole for the part, and from each of the pilot hole parts, the crater through hole is drilled in the crater piece thickness direction and in the optimum angle direction according to the heating target space. At the same time, a concealing plate is brazed on the back side of the gas supply passage main body groove, The ends of a pair of symmetrical gas supply pipes that are connected to the crater mounting port so that a pair of gas pressure crater parts formed using a gas pressure crater base body are formed into a body. A gas pressure welding burner characterized in that each part is connected to each other via a base end side connection part, and the crater piece parts are combined so as to face each other across the space to be heated. The crater parts for gas pressure welding are in the appropriate place selected from either of these crater pieces,
The gas pressure welding burner according to claim 1, wherein one or a plurality of through holes for craters are formed at an appropriately selected angle so that the space to be heated is heated uniformly .

Images