JP2000135562A - Welding auxiliary device used for welding active metal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce manufacturing costs by using a heat resistant metal as a rectification member for rectifying inert gas and provide a welding auxiliary device which is used for welding the active metal at small consumption volume of inert gas and good workability. SOLUTION: A welded material 10 composed of an active metal is covered along a weld line. This welding auxiliary device comprises a shield cover 30 which has a welding torch fixing part 31 at one side, a rectification member 50 composed of clusters of heat resistant metallic fiber or heat resistant metallic wire pieces dispersed in the shield cover 30 at the rear of the welding torch fixing part 31 in a way that a bottom 52 is supported by a mesh 40 composed of a heat resistant metal at a bottom 52, a gas discharge pipe 60 which extends in the rectification member 50, fills the rectification member 50 with an inert gas G and discharge the inert gas G from the mesh 40 at the bottom 52, and a guide member 70 for guiding the shield cover 30 and the welding torch 20 fixed thereto along the weld line.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding auxiliary device used for welding active metals for performing arc welding in an atmosphere of an inert gas.

[0002]

2. Description of the Related Art Conventionally, when welding an active metal such as titanium or zirconium, for example, as described in JP-A-5-161974, a straddle is formed on both sides of a welding torch in the axial direction of an active metal tube. The half-cracked box is put together and placed on the entire circumference of the active metal tube, and an inert gas is allowed to flow out of the orifice tube at the time of welding to the inner surface of the box and the surface of the active metal tube. There is disclosed a structure in which a sintered metal plate for forming a shielding gas atmosphere is provided, and a gas flow is rectified so that an inert gas flowing out of an orifice tube does not become turbulent.

[0003]

However, the above conventional example has the following problems. The sintered metal plate for forming the shielding gas atmosphere is
Although it is made porous to rectify the gas flow, it is specially ordered because it is manufactured according to the shape of the inner surface of the box that covers the entire circumference of the active metal tube and the shape of the part that opens to the active metal tube, Since it is a sintered metal, many steps such as refining, refining, and firing of the sintered metal material are required, the production cost is high, and much processing time is required. When welding the active metal tube in the circumferential direction, the box is arranged on the entire circumference of the active metal tube, so that the cost of manufacturing the box is high, and it takes a lot of time to mount and remove the box. A large amount of inert gas was consumed because the active gas was filled over the entire circumference of the active metal tube. The present invention has been made in view of such circumstances, and uses a heat-resistant metal as a rectifying member for rectifying an inert gas, thereby reducing manufacturing costs, reducing consumption of the inert gas, and improving workability. It is an object of the present invention to provide a welding auxiliary device used for welding active metals having good resistance.

[0004]

According to the present invention, there is provided a welding auxiliary apparatus for welding an active metal according to the present invention, which covers an object to be welded made of an active metal along a welding line, and has a welding torch fixed to one side. A set of a heat-resistant metal fiber or a heat-resistant metal wire piece which is dispersedly arranged in the shield cover behind the welding torch fixing portion and whose bottom is supported by a mesh made of a heat-resistant metal. A rectifying member, a gas discharge pipe extending into the rectifying member, filling the rectifying member with an inert gas, and discharging the inert gas from the bottom mesh; And a guide member for guiding a welding torch attached to the welding line along the welding line. With such a configuration, a rectifying member made of a set of heat-resistant metal fibers or heat-resistant metal wire pieces made of stainless steel or the like is dispersed and arranged in the shield cover, so that inert gas such as argon gas is rectified. It is rectified while passing through the member. In addition, the heat from the welding bead is easily transmitted by the inert gas rectified by the rectifying members dispersedly arranged in the shield cover, and the cooling effect of the entire welded portion is greater than in the case where the inside of the shield cover is hollow, The anti-oxidation effect of the weld bead immediately after welding can be improved.
In addition, a commercially available material such as stainless steel can be used as the material of the flow regulating member, and both the material and the man-hour can be reduced.

Here, the workpiece may be a pipe, and the lower surface of the shield cover may be formed in an arc shape along the outer circumference of the pipe. In this case, it is possible to prevent excess inert gas from flowing out from the lower surface of the shield cover, reduce the consumption of the inert gas, prevent air from being taken in from the outside, and generate a stable arc. Further, the guide member may be a pair of chains in which the welding line is located at the center, and both ends of the chain may be connected with a one-touch detachable fastener while the chain is wound around the pipe. In this case, the guide member can be easily attached to the pipe,
The welding torch is guided along the welding line, and the welding can be performed while maintaining a constant gap between the welding torch and the pipe, so that a stable welding bead can be obtained. In addition, air entrapment due to camera shake can be prevented by hand welding or the like, and air entrapment from the lower surface of the shield cover can be blocked by guide members provided on both sides of the shield cover. Further, the welding torch may be a torch for TIG welding, and may be detachably attached to the welding torch fixing portion of the shield cover with one touch. In this case, for example, when weaving the welding torch, the weaving device can be easily attached to and detached from the welding torch, and the workability of the welding torch can be improved. Further, an inert gas reservoir may be provided in front of the welding torch fixing portion of the shield cover. In this case, since the welded portion immediately before welding can be covered with the inert gas, oxidation of the welded portion immediately before welding can be prevented.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention. Here, FIG. 1 is a front sectional view of a welding auxiliary device used for welding an active metal according to an embodiment of the present invention, and FIG. 2 is a plan sectional view of the same.

As shown in FIGS. 1 and 2, in a welding assist device used for welding an active metal according to an embodiment of the present invention, a pipe 10 to be welded made of an active metal such as titanium or zirconium is used. Is provided along the welding line 11. Shield cover 30
One of them uses an inert gas G such as an argon gas.
A welding torch fixing part 31 cut out in a substantially circular shape for mounting the welding torch 20 for IG welding is provided. A torch fixing member 21 is provided in the vicinity of the welding torch fixing portion 31 so that the welding torch 20 can be attached and detached with one touch and the mounting position can be adjusted by a screw mechanism or the like. Shield cover 3
In front of the welding torch fixing portion 31 of 0, a reservoir 32 of an inert gas G having wall surfaces formed along both sides of the welding line 11 is provided. The lower surface of the shield cover 30 is formed in an arc shape along the outer periphery of the pipe 10. At the rear end 33 of the shield cover 30, an air-blocking cloth 34 made of heat-resistant fiber such as glass tape hanging down so as to contact the surface of the pipe 10 is attached. To prevent intrusion.
Since a gap is provided between the welding torch 20 and the shield cover 30 for weaving and adjusting the position of the welding torch 20, the portion of the shield cover 30 facing the welding torch 20 contacts the welding torch 20. In order to prevent the air from entering between the welding torch 20 and the shield cover 30, the air blocking cloth 34A is attached. Shield cover 30 behind welding torch fixing part 31
Inside, a rectifying member 50 composed of a set of heat-resistant metal fibers or heat-resistant metal wire pieces such as stainless steel having a higher thermal conductivity than air or sintered metal is dispersed and arranged. Front side 51 and bottom 52 facing the side
Is covered with a mesh 40 made of a porous or reticulated heat-resistant metal to support the rectifying member 50.

In the rectifying member 50, there is provided a gas discharge pipe 60 extending from the gas supply pipe 61 opened in the shield cover 30 along the direction in which the welding wire 11 extends. The gas discharge pipe 60 is provided with a plurality of discharge ports 62,
2, the inert gas G is filled in the rectifying member 50, and the inert gas G is discharged from the mesh 40 in a uniform flow toward the surface of the welding torch 20 and the pipe 10. I have to. A guide groove 35 is formed on the outer surface of the shield cover 30 along the direction in which the welding wire 11 extends.
A guide member 70 is provided on both sides of the shield cover 30 to engage with the guide groove 35 and guide the shield cover 30 and the welding torch 20 attached thereto along the welding line 11. The guide member 70 includes a pair of chains 71 in which the welding line 11 is positioned at the center, and a plurality of guide members 70 protruding from the side surfaces of the chains 71 at equal intervals in the longitudinal direction.
5, and an engagement pin 72 slidably engaged with
The chain 71 uses a chain material such as a link chain or a roller chain that can be freely bent on one plane and does not bend in the side direction. The chain 71 is a pipe 1
In a state of being wound around zero, both ends thereof can be connected by a one-touch detachable fastener 73 by a toggle mechanism.

Next, the operation of moving the welding torch 20 along the welding line 11 of the pipe 10 and performing welding will be described. After the welding line 11 of the pipe 10 is cleaned to enable TIG welding, the shield cover 30 is arranged so that the tip of the welding torch 20 is aligned with the welding line 11. The guide members 70 are arranged on both sides of the shield cover 30, the engaging pins 72 are engaged with the guide grooves 35, the chain 71 is wound around the pipe 10, and both ends are connected by fasteners 73. The inert gas G is discharged from the gas discharge pipe 60 to fill the straightening member 50 with the inert gas G, and the inert gas G is supplied from the mesh 40 of the front side 51 and the bottom 52 to the surface of the pipe 10 and the welding torch 20. And an inert gas G is supplied into the pipe 10 from a gas discharge tube (not shown) for a back shield. An arc is generated from the welding torch 20 while moving the shield cover 30 along the guide member 70 relative to the pipe 10 while bringing the filler material 12 close to the vicinity of the welding line 11 from above the pool portion 32. The additive 12 is melted to form a weld bead along the weld line 11. The length of the weld bead in one welding is preferably about 30 mm. Inert gas G flowing from the rectifying member 50 on the welding bead
With the weld bead approaching room temperature,
Continue forming the next weld bead.

With such a configuration, the shield cover 3
Since the rectifying member 50 made of a set of heat-resistant metal fibers or heat-resistant metal wire pieces made of stainless steel or the like is dispersedly arranged in the inside 0, heat transmitted from the welding bead is shielded through the rectifying member 50. It is easy to dissipate from the cover 30, and the cooling effect is greater than when the inside of the shield cover 30 is hollow. Further, since the work to be welded is made of the pipe 10 and the lower surface of the shield cover 30 is formed in an arc shape along the outer periphery of the pipe 10, the shield cover 30
It is possible to prevent excess inert gas G from flowing out from the lower surface of the device and to prevent air from being taken in from the outside. The guide member 70 includes a pair of chains 71 in which the welding line 11 is located at the center.
Since both ends are connected by a one-touch detachable fastener 73 in a state of being wound around zero, the guide member 70 can be easily attached to the pipe 10 and the welding torch 20 is moved along the welding line 11. The welding can be performed by a stable arc while guiding and maintaining a constant distance between the welding torch 20 and the pipe 10. In addition, the guide member 70 can also block air entrapment from the lower surface of the shield cover 30. Also,
The welding torch 20 is detachably attached to the welding torch fixing portion 31 of the shield cover 30 via the torch fixing member 21 with one touch. , A weaving device (not shown) can be attached and detached, and the workability of the welding torch 20 can be improved. Furthermore, since the inert gas G reservoir 32 is provided in front of the torch fixing portion 31 of the shield cover 30, the inert gas flowing out of the front part 51 of the shield cover 30 and the inert gas flowing out of the welding torch 20 immediately before welding is formed. It can be covered by G, and oxidation of the welded portion immediately before welding can be prevented. In the above embodiment, TIG welding has been described, but the present invention is also applicable to MIG welding. Also,
In the description of the above embodiment, the case where the work to be welded is a pipe has been described, but even when the work to be welded is a flat plate, the shield cover is formed linearly, and the guide groove and the guide member are formed linearly. By forming and fixing both ends of the guide member on a flat plate with a clamp or the like, the same effect as in the case of the pipe can be obtained.

[0011]

According to the first to fifth aspects of the present invention, there is provided a welding auxiliary device used for welding active metal, which covers an object to be welded made of active metal along a welding line, and one of which is provided with a welding torch fixing portion. A rectifying member comprising a set of a heat-resistant metal fiber or a heat-resistant metal wire piece, which is dispersedly disposed in the shield cover behind the welding torch fixing portion and whose bottom is supported by a mesh made of a heat-resistant metal. A gas discharge pipe extending into the rectifying member, filling the rectifying member with an inert gas, and discharging the inert gas from the mesh at the bottom portion; A guide member for guiding the welding torch along the welding line. Therefore, in the shield cover, a rectifying member composed of a collection of heat-resistant metal fibers or heat-resistant metal wire pieces made of stainless steel or the like having a higher thermal conductivity than air or sintered metal is dispersed and arranged. The heat transmitted from the bead is easily dissipated from the shield cover via the rectifying member, so that the cooling effect is greater than in the case where the inside of the shield cover is hollow, and the effect of preventing oxidation of the weld bead immediately after welding can be enhanced. In addition, a commercially available material such as stainless steel can be used as the material of the flow regulating member, and both the material and the man-hour can be reduced. In particular, in the welding auxiliary device used for welding an active metal according to claim 2, the workpiece is a pipe, and the lower surface of the shield cover is formed in an arc shape along the outer circumference of the pipe. Therefore, it is possible to prevent the extra inert gas from flowing out from the lower surface of the shield cover, reduce the consumption of the inert gas, prevent the entrainment of air from the outside, and generate a stable arc.

According to a third aspect of the present invention, in the welding auxiliary device used for welding an active metal, the guide member comprises a pair of chains in which the welding line is located at the center, and the chain is wound around the pipe. Since both ends can be connected by one-touch detachable fasteners, the guide member can be easily attached to the pipe, and the welding torch is guided along the welding line, and the gap between the welding torch and the pipe is provided. Welding can be performed while maintaining a constant interval. In addition, the guide member can block the entrainment of air from the lower surface of the shield cover and generate a stable arc. In the welding auxiliary device used for welding active metal according to claim 4, the welding torch is a torch for TIG welding, and is detachably attached to the welding torch fixing portion of the shield cover with one touch. Therefore, for example, when weaving the welding torch, the weaving device can be easily attached to and removed from the welding torch, and the workability of the welding torch can be improved. In the welding auxiliary device used for welding active metal according to claim 5, since the inert gas reservoir is provided in front of the welding torch fixing portion of the shield cover, the welding portion immediately before welding is inert gas. To prevent oxidation of the welded portion immediately before welding, so that a high-quality weld bead can be obtained.

[Brief description of the drawings]

FIG. 1 is a front sectional view of a welding auxiliary device used for welding an active metal according to an embodiment of the present invention.

FIG. 2 is a plan sectional view of a welding auxiliary device used for welding active metal according to one embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Pipe 11 Welding line 12 Filler material 20 Welding torch 21 Torch fixing member 30 Shield cover 31 Welding torch fixing part 32 Reservoir 33 Rear end 34 Air cutoff cloth 34A Air cutoff cloth 35 Guide groove 40 Mesh 50 Straightening member 51 Front side 52 Bottom part 60 Gas discharge pipe 61 Gas supply pipe 62 Discharge port 70 Guide member 71 Chain 72 Engagement pin 73 Fastener G Inert gas

Claims (5)

[Claims] An object to be welded made of an active metal is covered along a welding line, and a shield cover provided with a welding torch fixing part on one side, and distributed in the shield cover behind the welding torch fixing part. And a rectifying member comprising a set of heat-resistant metal fibers or heat-resistant metal wire pieces whose bottoms are supported by a mesh made of a heat-resistant metal, and an inert gas that extends into the rectifying member and is contained in the rectifying member. And a guide member that guides the shield cover and a welding torch attached to the shield cover along the welding line, and a gas discharge pipe that discharges the inert gas from the bottom mesh. Welding auxiliary equipment used for welding active metals. 2. A welding auxiliary device used for welding an active metal according to claim 1, wherein said workpiece is a pipe, and a lower surface of said shield cover is formed in an arc shape along an outer periphery of said pipe. A welding auxiliary device used for welding active metals. 3. A welding auxiliary device used for welding an active metal according to claim 2, wherein said guide member comprises a pair of chains in which said welding line is located at the center, and said chain is wound around said pipe. A welding auxiliary device used for welding active metal, wherein both ends thereof can be connected by a one-touch detachable fastener in a state. 4. The welding auxiliary device according to claim 1, wherein the welding torch is a torch for TIG welding, and the welding torch is fixed to the shield cover. A welding auxiliary device used for welding active metal, characterized in that it is detachably attached to a part with one touch. 5. The welding auxiliary device used for welding an active metal according to claim 1, wherein an inert gas reservoir is provided in front of a welding torch fixing portion of the shield cover. A welding auxiliary device used for welding active metals, characterized in that: