JP5615586B2 - Arc welding torch - Google Patents

Description

  The present invention relates to an arc welding torch using a filler wire together with a welding wire.

  In a conventional arc welding torch, a power supply tip for feeding a welding wire (first welding wire) as a consumable electrode and a filler wire (second welding wire) toward a welding region of a base material to which the power supply tip is directed. Some include a guide member that is fed out and a nozzle cover (see, for example, Patent Document 1). In this torch, the power feed tip and the guide member are covered with a nozzle cover. The nozzle cover is formed in an elliptic cylinder shape. The space around the power feed tip and the guide member inside the nozzle cover is used as a shield gas supply path.

  In the arc welding torch, an arc is generated between the welding wire and the base material, and this arc forms a molten pool in the weld region of the base material, and a filler wire is inserted into the molten pool. During such welding, shield gas is ejected from the opening at the tip of the nozzle cover. The shielding gas covers the arc and the molten pool, and shields the welding atmosphere from the atmosphere.

  However, in the conventional arc welding torch, a shield gas supply path is formed after arranging two members such as a power feed tip and a guide member inside the nozzle cover. There is a possibility that the resistance is large and the ejection of the shielding gas is not stable. If the ejection of the shielding gas is not stable, the weld bead cannot be formed with high quality.

  In order to stabilize the ejection of the shield gas, it is only necessary to increase the supply amount of the shield gas, but this increases the running cost. The tip opening of the nozzle cover from which the shield gas is ejected has an elliptical ring shape due to the arrangement of the two members, and the gap is relatively large. Even in this case, the nozzle cover is disadvantageous in terms of running cost because the amount of shield gas ejected is increased.

  The nozzle cover cannot be used as a general-purpose part because it has a structure in which the corresponding power supply chip and guide member are held together at an appropriate interval and then integrally mounted. Further, in order to adjust the target position of the filler wire with respect to the welding wire by adjusting the distance between the power feed tip and the guide member, a special mechanism is separately required, and the target position of the filler wire cannot be easily adjusted. .

JP 2008-55506 A

  The present invention has been conceived under the above circumstances, and provides an arc welding torch capable of improving the ejection characteristics of shield gas, the adjustability of the filler wire aiming position, and versatility. That is the issue.

  In order to solve the above problems, the present invention takes the following technical means.

An arc welding torch provided by the present invention includes a torch nozzle that feeds a welding wire as a consumable electrode from a tip portion, filler wire feeding means that feeds a filler wire toward a region directed to the tip portion of the torch nozzle, and the torch nozzle And a filler wire feeding means, and a connecting means for connecting them , wherein the torch nozzle guides the welding wire in the first axial direction. And a feeding tip portion for supplying a welding current, and a cylindrical outer portion surrounding the feeding tip portion and projecting the welding wire from the opening on the first axial direction front end, the filler wire feeding means, A tubular filler guide for guiding the filler wire in the second axial direction; A guide tip for projecting the filler wire from the distal end side in the second axial direction toward the region, the first axis is linear, and the proximal end side in the second axial direction of the filler guide is The filler guide is disposed in parallel to the first axis, and the second axial end of the filler guide extends closer to the first axis as approaching the distal end. A bracket member connected in a clamped manner to the filler guide at the same time as being clamped to the cylindrical sheath, and at least one of the cylindrical sheath and the filler guide one is position adjustment in the axial direction is characterized by capable der Rukoto respect to the bracket member.

  In a preferred embodiment of the present invention, the bracket member is positioned in a radial direction with respect to the first hole in which the cylindrical mantle portion is inserted in the first axial direction, and the first hole, The filler guide is formed between the second hole inserted in the second axial direction, the first hole, and the second hole, and communicates with the first and second holes and is screwed. The bracket member is configured such that when the screw is fastened to the screw hole, the slit is pressed to reduce the diameter of the first and second holes.

  In a preferred embodiment of the present invention, the connecting means further includes a cover member that entirely surrounds both the cylindrical mantle and the filler guide.

  In a preferred embodiment of the present invention, the cover member includes a first member and a second member that can be divided with a plane including the first axis and the second axis as a boundary. The second member has first and second cylindrical inner surface portions that are united with each other by being attached to the bracket member, and individually surround the cylindrical mantle portion and the filler guide, respectively.

  In a preferred embodiment of the present invention, a first shield gas supply path is formed between the power feed tip portion and the cylindrical mantle portion, and the cylindrical mantle portion and the corresponding first mantle portion. A second shield gas supply path is formed between the first cylindrical inner surface portion.

  In a preferred embodiment of the present invention, a third shield gas supply path is further formed between the filler guide and the second cylindrical inner surface corresponding to the filler guide.

  According to the present invention, a filler wire feeding means can be connected to a general single torch in a clamped manner, for example, via a bracket member to which a cover member is attached. The cover member can be constituted by a first member and a second member that are attached to, for example, a bracket member and united with each other, and that individually cover the torch nozzle and the filler wire feeding means. Such bracket members and cover members correspond to torch nozzles and filler wire feeding means of various sizes and can be used for general purposes. The shield gas is ejected from, for example, a first shield gas supply path formed between the cylindrical mantle portion of the torch nozzle and the power feed tip portion, and separately from the second shield gas formed between the cover member and the torch nozzle. It can also be ejected from the shield gas supply path. Thereby, shield gas is stably ejected with sufficient ejection amount. In order to adjust the target position of the filler wire, for example, these may be connected in a clamped manner while adjusting the position where the torch nozzle or filler wire feeding means is connected to the bracket member.

  Other features and advantages of the present invention will become more apparent from the detailed description given below with reference to the accompanying drawings.

1 is a cross-sectional view showing a first embodiment of an arc welding torch according to the present invention. FIG. 2 is a cross-sectional view of a torch nozzle included in the arc welding torch of FIG. 1. It is sectional drawing of the filler wire delivery means contained in the torch for arc welding of FIG. FIG. 2 is a top view of a bracket member included in the arc welding torch of FIG. 1. It is sectional drawing which follows the VV line of FIG. FIG. 2 is a top view of a cover member included in the arc welding torch of FIG. 1. It is a side view of the cover member shown in FIG. It is sectional drawing which shows 2nd Embodiment of the torch for arc welding which concerns on this invention. FIG. 9 is a side view of a cover member included in the arc welding torch of FIG. 8.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

  1 to 7 show a first embodiment of an arc welding torch according to the present invention. The arc welding torch A1 of this embodiment is applied to consumable electrode type gas shielded arc welding such as so-called MIG welding or MAG welding.

  As shown in FIG. 1, an arc welding torch A1 includes a torch 1 for feeding a welding wire (not shown) as a consumable electrode, a filler wire feeding means 2 for feeding a filler wire (not shown) separately from these, and these And a connecting means 3 for connecting the torch 1 and the filler wire feeding means 2. As shown in FIG. 2, the torch 1 has the same components as those of a known single torch, and is configured to include a power feed tip portion 10 inside a cylindrical mantle portion 11. As shown in FIG. 3, the filler wire feeding means 2 includes a guide tip 21 at the tip of the filler guide 20. As shown in FIGS. 4 to 7, the connecting means 3 includes a bracket member 30 and a cover member 31. The cover member 31 includes a first member 31A and a second member 31B that can be divided from each other.

  The torch 1 is connected to the tip of a circular tubular torch body 12, and the welding point P1 is guided while guiding the welding wire fed through the torch body 12 along the linear first axis S1. Move towards the.

  As shown in FIG. 2, the power feed tip portion 10 of the torch 1 includes a first tip body 100, an orifice member 101, a second tip body 102, and a power feed tip 103.

  The first chip body 100 is made of a conductive material such as copper and is formed in a circular tube shape. The proximal end of the first tip body 100 is fixed to the distal end of the torch body 12 by screwing fastening. As a result, the welding wire fed from the torch body 12 is inserted into the first tip body 100. At the center of the first tip body 100 in the first axis S1 direction, a plurality of gas outlets 100A are formed around the first axis S1. Shield gas supplied from a gas cylinder (not shown) passes through the inside of the first tip body 100 from the torch body 12 and is jetted out of the first tip body 100 from the gas jet outlet 100A.

  The orifice member 101 is formed in a substantially cylindrical shape, and is fixed to the central portion of the first tip body 100 in the first axis S1 direction so as to cover the gas ejection port 100A from the outside. The orifice member 101 is formed with an internal space 101A that communicates with the gas outlet 100A. At the center of the orifice member 101 in the first axis S1 direction, a plurality of orifices 101B communicating with the internal space 101A and the outside are formed side by side around the first axis S1. Thereby, the shielding gas ejected from the gas ejection port 100A is ejected to the outside through the internal space 101A and the orifice 101B of the orifice member 101.

  The second chip body 102 is made of a conductive material such as copper and is formed in a cylindrical shape. The proximal end of the second chip body 102 is fixed to the distal end of the first chip body 100 by screwing fastening.

The power supply chip 103 is made of a conductive material such as copper tungsten, chrome copper, beryllium copper, conductive ceramics, or stainless steel, and is formed in a cylindrical shape. A first axis line S1 direction base end side of the power feed tip 103 is tapered hole 103A is formed, the inner diameter of up to the first axis line S1-way Kosaki end is smaller than the inner diameter of the second tip body 102 . The base end of the power feed tip 103 is fixed to the tip end of the second tip body 102 by screw fastening. A predetermined level of voltage is applied to the power supply chip 103 from a power supply device (not shown). Thus, in the interior of the power feed tip 103, the welding wire from the second tip body 102 is inserted while making contact with the inner surface of the sheet conductive tips 103, from the tip of the power supply tip 103, and matches the first axis line S1 Welding The wire protrudes. A welding current for generating an arc flows through the power supply tip 103 through the welding wire.

  As shown in FIG. 2, the cylindrical mantle portion 11 of the torch 1 includes an insulating bush 110 and a nozzle 111.

  The insulating bush 110 is formed in a cylindrical shape using an electrically insulating material, and the first tip body 100 is inserted into the insulating bush 110. The insulating bush 110 includes a fixing portion 110A that is directly fixed to the connecting means 3, and a flange portion 110B that is adjacent to the fixing portion 110A in the direction of the first axis S1 and has a larger outer diameter than the fixing portion 110A. The fixing portion 110A is provided on the opposite side of the flange portion 110B and has a connecting portion 110C to which the nozzle 111 is connected. 110 A of fixed parts have a predetermined | prescribed outer diameter dimension, and the outer peripheral surface is formed in cylindrical surface shape. The flange portion 110B is fixed to the tip of the torch body 12 by screw fastening. A part of the connecting means 3 fixed to the fixing portion 110A comes into contact with the end surface of the flange portion 110B on the fixing portion 110A side. Thereby, the torch 1 is positioned and fixed with respect to the connecting means 3 in the direction of the first axis S1. The proximal end side of the nozzle 111 is fixed to the connecting portion 110C by screwing fastening.

  The nozzle 111 is formed in a cylindrical shape, and is outside the most part of the power feed tip portion 10 such as the first tip body 100, the portion provided with the orifice 101 </ b> B of the orifice member 101, the second tip body 102, and the power feed tip 103. The inner diameter is larger than the diameter. Thus, a first shield gas supply path G1 having an annular cross section is formed between the inner peripheral surface of the nozzle 111 and the power supply tip portion 10. Shield gas is supplied to the first shield gas supply path G1 via the orifice 101B. The tip of the power feed tip 103 is located at the tip opening of the nozzle 111. As a result, an annular gap 111A leading from the first shield gas supply path G1 to the outside is formed at the tip opening of the nozzle 111, and the shield gas that has passed through the shield gas supply path G1 passes through the annular gap 111A. Erupts from.

  The filler wire feeding means 2 is connected to the tip of a conduit tube (not shown), for example, and guides the filler wire fed through the tube along the bent second axis S2. When the direction in which the arc welding torch A1 moves with respect to the base material is the welding direction F, the filler wire feeding means 2 feeds the filler wire toward the target position P2 on the rear side in the welding direction F from the welding point P1. .

  As shown in FIG. 3, the filler guide 20 of the filler wire feeding means 2 includes a guide adapter 200 and a guide member 201.

  The guide adapter 200 includes a cylindrical first connection member 200A and a second connection member 200B. 200 A of 1st connection members are directly fixed with respect to the 2nd axis line S2 direction base end side of the guide member 201 by screwing fastening. The second connecting member 200B is fixed to the proximal end side in the second axis S2 direction of the first connecting member 200A by screwing fastening, and connects the distal end of a conduit tube (not shown) to the first connecting member 200A. As a result, the filler wire fed from the conduit tube is inserted into the guide adapter 200.

  The guide member 201 is made of stainless steel, for example, and is made of a tube bent along the second axis S2. A tapered hole 201A is formed on the proximal end side of the guide member 201 in the second axis S2 direction, and the inner diameter from the tapered hole 201A to the distal end in the second axis S2 direction is smaller than the inner diameter of the guide adapter 200. . The guide chip 21 is connected to the distal end of the guide member 201 in the second axis S2 direction by screwing.

The guide chip 21 is formed in a cylindrical shape using an electrically insulating material. Inside the guide tip 21 is formed a tapered hole 210 that gradually becomes smaller in diameter as it proceeds from the proximal end side in the second axis S2 direction to the distal end side. Accordingly, the filler wire from the guide member 201 is inserted into the guide tip 21 while being guided by the tapered hole 210, and the filler wire protrudes from the tip of the guide tip 21 in conformity with the second axis S2. .

  As shown in FIG. 1, the bracket member 30 of the connecting means 3 connects the insulating bush 110 of the cylindrical mantle 11 and the guide adapter 200 of the filler guide 20 in a clamped manner. As shown in FIG. 4, the bracket member 30 includes a first hole 300 into which the fixing portion 110A of the insulating bush 110 can be inserted in the first axis S1 direction, and a first connection member 200A of the guide adapter 200 as the second axis. A second hole 301 that can be inserted in the S2 direction, a slit 302 communicating with the first and second holes 300, 301, a screw hole 303 formed so as to penetrate the slit 302, and a cover member And a pair of extending portions 304 (see FIGS. 1 and 5) to which 31 is attached.

  The first and second holes 300 and 301 are cylindrical holes corresponding to the outer diameters of the fixing portion 110A and the first connecting member 200A, and are separated from each other in the radial direction. In a state where the screw 305 is not fastened to the screw hole 303, the inner diameters of the first and second holes 300 and 301 are slightly larger than the outer diameters of the fixed portion 110A and the first connecting member 200A. The slit 302 is formed between the first and second holes 300 and 301 and extends in the radial direction connecting the centers thereof. Both ends of the slit 302 are formed so as to cut out part of the inner surfaces of the first and second holes 300 and 301. The pair of extending portions 304 extends from the vicinity of the slit 302 in the direction of the central axis of the first and second holes 300 and 301. These extension portions 304 are provided with screw holes 304A for fastening the screws 306 shown in FIG. 6 and attaching the cover members 31 (first member 31A and second member 31B).

  A screw hole 303 corresponding to the slit 302 is formed so as to penetrate perpendicularly to the inner wall surface of the slit 302. A screw 305 is fastened to the screw hole 303 through the slit 302. As a result, the inner wall surfaces of the slits 302 are pressed toward each other or until they come into contact with each other, and as a result, the inner diameters of the first and second holes 300 and 301 are reduced. At this time, as shown in FIG. 1, if the fixing portion 110 </ b> A and the first connecting member 200 </ b> A are inserted into the first and second holes 300 and 301, the fixing portion 110 </ b> A and the first connecting member 200 </ b> A are The first and second holes 300 and 301 are held in close contact with the inner surfaces. Thereby, the bracket member 30 simultaneously connects the torch 1 and the filler wire feeding means 2 to each other. At that time, the end surface of the flange portion 110 </ b> B comes into contact with the periphery of the edge portion of the first hole 300, whereby the torch 1 is positioned with respect to the bracket member 30 in the first axis S <b> 1 direction. On the other hand, the filler wire feeding means 2 can move to some extent in the direction of the second axis S <b> 2 until the first connecting member 200 </ b> A is firmly fixed to the second hole 301. Therefore, the filler wire feeding means 2 can be positioned with respect to the bracket member 30 while moving and adjusting in the direction of the second axis S2. When the torch 1 and the filler wire feeding means 2 are connected to the bracket member 30 as described above, the base end side in the second axis S2 direction of the filler guide 20 is always at a constant interval with respect to the first axis S1 direction of the torch 1. In the meantime, the tip end side in the second axis S2 direction extends to approach the first axis S1 as the tip approaches.

  The cover member 31 of the connecting means 3 surrounds both the cylindrical mantle 11 and the filler guide 20, and separately encloses them. The cover member 31 includes a first member 31A and a second member 31B (see FIG. 7) that are attached to the extending portion 304 after the torch 1 and the filler wire feeding means 2 are connected to the bracket member 30.

The first member 31 </ b> A and the second member 31 </ b> B can be divided and combined with a plane including the first axis S <b> 1 and the second axis S <b> 2 as a boundary in a state where the torch 1 and the filler wire feeding means 2 are connected to the bracket member 30. Yes, with symmetrical shapes. As shown in FIG. 7, each of the first member 31 </ b> A and the second member 31 </ b> B includes a first columnar inner surface portion 310 that surrounds the cylindrical mantle portion 11 and a second columnar inner surface portion 311 that surrounds the filler guide 20. The shield gas is guided to each of the step 312 corresponding to the extension 304 of the bracket member 30, the screw hole 313 formed in the step 312, and the first and second cylindrical inner surface portions 310 and 311. First and second shield gas introduction paths 314 and 315 are provided. The first member 31A is provided with communication holes 316 and 317 that allow the first and second shield gas introduction paths 314 and 315 to communicate with the outside.

  The first cylindrical inner surface portion 310 forms a semi-cylindrical surface when the first member 31A and the second member 31B are divided. When the first member 31A and the second member 31B are attached to the bracket member 30 to which the torch 1 is connected, the first cylindrical inner surface portion 310 is integrated with each other as shown in FIG. A cylindrical internal space with S1 as the central axis is formed. In this internal space, most of the nozzle 111 of the torch 1 is accommodated with a gap. The proximal end side in the first axis S1 direction of the internal space is sealed by holding the fixing portion 110A of the torch 1 in the first hole 300 of the bracket member 30. From the tip of the first cylindrical inner surface portion 310, the tip of the nozzle 111 protrudes toward the welding point P1. As a result, a second shield gas supply path G2 having an annular cross section is formed between the outer peripheral surface of the nozzle 111 and the first cylindrical inner surface portion 310.

  In the state where the first member 31A and the second member 31B are divided, the second cylindrical inner surface portion 311 has a semi-cylindrical surface on the proximal end side and a semi-conical surface on the distal end side. When the first member 31A and the second member 31B are attached to the bracket member 30 to which the filler wire feeding means 2 is connected, the second cylindrical inner surface portion 311 is integrated with each other as shown in FIG. A substantially cylindrical internal space having the second axis S2 as a central axis is formed. In the internal space, most of the guide member 201 of the filler wire feeding means 2 is accommodated with a gap. The proximal end side of the internal space in the second axis S2 direction is sealed by sandwiching the first connecting member 200A of the filler wire feeding means 2 in the second hole 301 of the bracket member 30. From the tip of the second cylindrical inner surface portion 311, the tip of the guide member 201 protrudes toward the filler wire aiming position P2. Thus, a third shield gas supply path G3 having an annular cross section is formed between the outer peripheral surface of the guide member 201 and the second cylindrical inner surface portion 311. Between the first and second cylindrical inner surface portions 310 and 311, an end surface 320 is formed that contacts each other when the first member 31A and the second member 31B are combined. When the end surface 320 abuts, the internal space by the first cylindrical inner surface portion 310 and the internal space by the second cylindrical inner surface portion 311 are partitioned.

The step portion 312 is formed between the proximal end side of the first cylindrical inner surface portion 310 and the proximal end side of the second cylindrical inner surface portion 311 . The step portion 312 corresponds to the extended portion 304 of the bracket member 30 and is stepped down from the end face 320. Both ends of the step portion 312 are continuous with the first and second cylindrical inner surface portions 310 and 311. As shown in FIG. 1, in the state where the torch 1 and the filler wire feeding means 2 are connected to the bracket member 30, the step portions 312 of the first member 31A and the second member 31B are integrated with each other to form a pair of extending portions. A concave fitting portion into which 304 can be fitted is formed. After the pair of extending portions 304 are inserted into the recessed fitting portions, the screws 306 are fastened to the screw holes 313 of the first member 31A and the second member 31B and the screw holes 304A of the extending portion 304. Then, the first member 31 </ b> A and the second member 31 </ b> B merge with the surface including the first axis S <b> 1 and the second axis S <b> 2 as a boundary, the nozzle 111 is covered by the first cylindrical inner surface portion 310, and the second circle The guide member 201 is covered with the columnar inner surface portion 311.

  The first and second shield gas introduction paths 314 and 315 are formed in a groove shape with respect to the end face 320. The first shield gas introduction path 314 communicates only with the first cylindrical inner surface portion 310. The second shield gas introduction path 315 communicates only with the second cylindrical inner surface portion 311. As shown in FIG. 1, when the first member 31A and the second member 31B are attached to and combined with the bracket member 30 in a state where the torch 1 and the filler wire feeding means 2 are connected to the bracket member 30, the first shield gas The introduction path 314 forms a hole that continues from the communication hole 316 to the second shield gas supply path G2. Thereby, the shield gas supplied from the gas cylinder is guided from the communication hole 316 through the hole by the first shield gas introduction path 314 to the second shield gas supply path G2. On the other hand, the second shield gas introduction path 315 forms a hole that continues from the communication hole 317 to the third shield gas supply path G3. Thereby, the shield gas supplied from the gas cylinder is guided from the communication hole 317 through the hole by the second shield gas introduction path 315 to the third shield gas supply path G3.

  Next, the operation of the arc welding torch A1 will be described.

  As shown in FIG. 1, the torch 1 is supported by a welding robot (not shown) such that the welding wire has a predetermined protruding length y with respect to the surface of the base material, and is moved in the welding direction F at a predetermined speed.

  At that time, an arc is generated between the welding wire and the base material, and a molten pool (portion where the welding wire and the base material are melted and accumulated) is formed around the welding point P1 of the base material by the arc.

  On the other hand, the filler wire is protruded toward the target position P2 by the filler wire feeding means 2 connected to the torch 1 via the connecting means 3, and is inserted into the molten pool formed around the welding point P1. The target position P2 is set to a position farther from the welding point P1 on the side opposite to the welding direction F as the welding speed becomes higher, and closer to the welding point P1 as the welding position becomes higher. The set distance x of the target position P2 with respect to the welding point P1 is set within a range of about 2 to 5 mm from the welding point P1, for example.

  At this time, the shield gas that has passed through the first shield gas supply path G1 is ejected from the tip of the torch 1 around the welding point P1. Further, the shield gas that has passed through the second shield gas supply path G2 is ejected around the welding point P1 from the tip portion of the cover member 31 corresponding to the first cylindrical inner surface portion 310. The first shield gas supply path G1 and the second shield gas supply path G2 are spaces having an annular cross section. Therefore, the shielding gas is ejected around the welding point P1 so as to form a cylindrical double wall. This shielding gas covers the molten pool together with the arc and shields the welding atmosphere from the atmosphere. As a result, the shield gas is stably ejected with a sufficient ejection amount, and the running cost is reduced. The shield gas flowing through the second shield gas supply path G2 also serves to cool the nozzle 111.

  At this time, the shield gas that has passed through the third shield gas supply path G3 is ejected from the front end portion of the cover member 31 corresponding to the second cylindrical inner surface portion 311 to the vicinity of the target position P2 of the filler wire. The third shield gas supply path G3 is a relatively narrow space partitioned from the first shield gas supply path G1 and the second shield gas supply path G2. The shield gas from the third shield gas supply path G3 shields from the atmosphere the cooling promoting portion of the molten pool into which the filler wire is inserted after the arc is extinguished. Also by this, the shield gas can be stably ejected without waste, and a sound weld bead can be formed. The shield gas flowing through the third shield gas supply path G3 also serves to cool the filler guide 20.

  Most of these torch 1 and filler wire feeding means 2 that are moved in the welding direction F as described above are protected by the cover member 31, so there is no risk of deformation or damage, and the target position of the filler wire P2 can be kept appropriate.

  The arc welding torch A1 is assembled as follows.

  First, the operator inserts the torch 1 into the first hole 300 of the bracket member 30, and the second hole 301 of the bracket member 30 so that the guide tip 21 is positioned on the distal end side of the torch 1. The filler wire feeding means 2 is inserted into the.

  Next, the operator brings the flange portion 110B of the torch 1 into contact with the end surface of the bracket member 30 so that the torch 1 is positioned in the direction of the first axis S1. On the other hand, the operator moves and adjusts the filler wire feeding means 2 in the direction of the central axis of the second hole 301 so that the filler wire aiming position P2 is a predetermined distance x with respect to the welding point P1.

  When the position of the filler wire feeding means 2 in the second axis S2 direction is determined with respect to the target position P2, the operator fastens the screw 305 in the screw hole 303 of the bracket member 30. Thereby, the torch 1 and the filler wire feeding means 2 are simultaneously sandwiched by the first and second holes 300 and 301 and are connected to each other via the bracket member 30.

  At this time, in order to adjust the target position P2 of the filler wire, the fastening of the screw 305 in the bracket member 30 is slightly loosened, and the filler wire feeding means 2 is moved and adjusted in the central axis direction of the second hole 301. For example, when the filler wire feeding means 2 is moved downward in FIG. 1, the guide tip 21 approaches the base material, and the target position P2 moves away from the welding point P1. Conversely, when the filler wire feeding means 2 is moved upward, the target position P2 approaches the welding point P1. The operator can easily perform the adjustment operation of the aiming position P2 as described above.

  Thereafter, the worker brings the stepped portion 312 of the first member 31 </ b> A and the second member 31 </ b> B together with the extended portion 304 of the bracket member 30, and fastens the screw 306 to the screw hole 313 provided in the stepped portion 312. Thereby, the first member 31A and the second member 31B are united with each other to form the cover member 31 that individually covers the nozzle 111 and the filler guide 20, and the assembly of the arc welding torch A1 is completed. The bracket member 30 and the cover member 31 can be easily removed by a procedure reverse to the above.

  Such bracket member 30 and cover member 31 can be attached to other torches and filler wire feeding means of the same type, and can be used for general purposes. For example, when the amount of shield gas ejected from the first shield gas supply path G1 of the torch 1 is sufficient and the cooling promoting portion of the molten pool into which the filler wire is inserted is shielded from the atmosphere by the shield gas, the second shield Since the gas supply path G2 and the third shield gas supply path G3 are not necessary, only the bracket member 30 can be used without attaching the cover member 31.

  8 and 9 show a second embodiment of the arc welding torch according to the present invention. Note that the arc welding torch A2 shown in the present embodiment is different from that of the first embodiment described above only in the configuration of the cover member 31.

  Specifically, as shown in FIG. 9, the first member 31A and the second member 31B are provided with the first shield gas introduction path 314, while there is no second shield gas introduction path. The cylindrical inner surface portion 311 of No. 2 has a shape in which approximately half of the tip end side exposes a part of the tip end side of the filler guide 20. In such an arc welding torch A2, as shown in FIG. 8, the third shield gas supply path is not formed around the filler guide 20, and the first shield gas supply path G1 of the torch 1 and the first cylindrical shape are formed. The shield gas is ejected through the second shield gas supply path G2 formed by the inner surface portion 310. Such an arc welding torch A2 is effective when there is a sufficient shielding effect only by the shielding gas from the first shield gas supply path G1 and the second shield gas supply path G2, and the third shield gas supply path is Since it is not provided, the amount of the shield gas ejected is suppressed, and the running cost can be further reduced.

  In addition, this invention is not limited to said embodiment.

  The configuration shown in each of the above embodiments is merely an example, and all changes in each part within the scope of the matters described in each claim are included in the scope of the present invention.

  For example, the torch may not be provided with a flange portion that can be positioned with respect to the bracket member. In that case, when adjusting the target position of the filler wire, both the torch and the filler wire feeding means may be appropriately adjusted in the direction of the central axis of the first and second holes in the bracket member.

A1, A2 Arc welding torch S1 1st axis S2 2nd axis G1 1st shield gas supply path G2 2nd shield gas supply path G3 3rd shield gas supply path 1 Torch 10 Feed tip part 11 Cylindrical mantle part 2 Filler wire Feeding means 20 Filler guide 21 Guide chip 3 Connecting means 30 Bracket member 300 First hole 301 Second hole 302 Slit 303 Screw hole 31 Cover member 31A First member 31B Second member 310 First cylindrical inner surface 311 First 2 cylindrical inner surface

Claims (6)

A torch nozzle that feeds a welding wire as a consumable electrode from the tip, a filler wire feeding means that feeds a filler wire toward a region to which the tip of the torch nozzle is directed, and the torch nozzle and the filler wire feeding means are individually mounted. And an arc welding torch comprising a connecting means for connecting them ,
The torch nozzle includes a power supply tip portion that guides the welding wire in the first axial direction and supplies a welding current, and a cylinder that surrounds the power supply tip portion and projects the welding wire from the opening on the front end side in the first axial direction. And a cloak
The filler wire feeding means includes a tubular filler guide that guides the filler wire in the second axial direction, and a guide tip that projects the filler wire from the distal end side in the second axial direction of the filler guide toward the region. Have
The first axis is linear, and the second axial base end side of the filler guide is arranged in parallel to the first axis, while the second axial front end side of the filler guide is , Extending toward the first axis as it approaches the tip,
The connecting means includes a bracket member connected to the filler guide in a clamping manner at the same time as being connected to the cylindrical jacket portion in a clamping manner, and
Is at least one of the cylindrical mantle and the filler guide, position adjustment in the axial direction and wherein the enable der Rukoto respect to the bracket member, arc welding torch. The bracket member includes a first hole in which the cylindrical mantle is inserted in the first axial direction, and a radial direction with respect to the first hole, and the filler guide is in the second axial direction. A second hole to be inserted, and a slit formed between the first hole and the second hole, and communicated with the first and second holes and provided with a screw hole. the bracket member when fastening the screw into the screw hole, the slit is pressed is configured as the first and second holes is reduced in diameter, a torch for arc welding according to claim 1 . The arc welding torch according to claim 1 or 2 , wherein the connecting means further includes a cover member that entirely surrounds both the cylindrical mantle and the filler guide. The cover member includes a first member and a second member that can be divided with a plane including the first axis and the second axis as a boundary,
The first member and the second member are attached to the bracket member so as to be combined with each other, and have first and second columnar inner surfaces that individually surround the cylindrical mantle and the filler guide, respectively. The torch for arc welding according to claim 3 . A first shield gas supply path is formed between the power feed tip portion and the cylindrical mantle portion, and between the cylindrical mantle portion and the corresponding first columnar inner surface portion. The arc welding torch according to claim 4 , wherein a second shield gas supply path is formed. 6. The arc welding torch according to claim 5 , wherein a third shield gas supply path is further formed between the filler guide and the second cylindrical inner surface corresponding to the filler guide.

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