WO2020054312A1 - Horizontal butt welding method - Google Patents

Horizontal butt welding method Download PDF

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Publication number
WO2020054312A1
WO2020054312A1 PCT/JP2019/032092 JP2019032092W WO2020054312A1 WO 2020054312 A1 WO2020054312 A1 WO 2020054312A1 JP 2019032092 W JP2019032092 W JP 2019032092W WO 2020054312 A1 WO2020054312 A1 WO 2020054312A1
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Prior art keywords
groove
angle
welding
horizontal
horizontal plane
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PCT/JP2019/032092
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French (fr)
Japanese (ja)
Inventor
将一 野々村
直貴 大岩
秀隆 早川
亨 飯島
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株式会社Ihi
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Priority to JP2020546787A priority Critical patent/JP7082327B2/en
Publication of WO2020054312A1 publication Critical patent/WO2020054312A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K33/00—Specially-profiled edge portions of workpieces for making soldering or welding connections; Filling the seams formed thereby
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/02—Seam welding; Backing means; Inserts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/23—Arc welding or cutting taking account of the properties of the materials to be welded

Definitions

  • the present disclosure relates to a horizontal butt welding used in manufacturing a large-sized structure, for example, a self-supporting square tank (Self-supporting, ⁇ Prismatic-shape ⁇ IMO type B) mounted on a tanker. It is about the method.
  • a self-supporting square tank Self-supporting, ⁇ Prismatic-shape ⁇ IMO type B mounted on a tanker. It is about the method.
  • the self-standing square tank described above there is an aluminum alloy tank manufactured according to the shape of the hull, and such a self-standing square tank is composed of a large number of individually manufactured blocks.
  • the manufacture of many of these blocks starts with butt joining of large panels made of aluminum alloy (for example, large panels of 16 m square; material to be welded) by MIG welding.
  • a lateral butt welding method adopted for the butt joining of the blocks described above there is, for example, a horizontal automatic welding method described in Patent Document 1.
  • a groove is formed between the standing wall panels of the vertically stacked blocks, a welding torch is mounted on a bogie equipped with a weaving mechanism, and a welding wire is supplied to the welding torch that operates weaving
  • the bogie is moved along the groove to perform lateral welding.
  • the angle formed by the substantially horizontal lower groove surface of the groove (the end surface of the standing wall panel in the lower block) and the welding torch (welding wire) is 0 to 30 °.
  • the present disclosure has been made in view of the above-described conventional problems, and has as its object to provide a horizontal butt welding method capable of performing a horizontal butt welding to an aluminum alloy without causing a welding defect. .
  • a first aspect of the present disclosure is directed to a horizontal butt welding method in which aluminum alloy workpieces supported side by side are butt-joined to each other, and a lateral V groove is formed at a butt portion between the workpieces.
  • the angle ⁇ a formed by the upper groove surface of the V groove with respect to the horizontal plane is set to be larger than the angle ⁇ b formed by the lower groove surface of the V groove with respect to the horizontal plane, and the welding torch is moved along the V groove.
  • the first pass at the time of filling the meat by passing it a plurality of times while weaving is performed with the welding torch horizontal, and thereafter, the pass of filling the meat directly on the lower groove face of the V groove is the welding.
  • the torch is inclined at an angle ⁇ b downward with respect to the horizontal plane, and the meat is piled up from the lower bead on the lower groove surface of the V groove to the upper groove surface of the V groove.
  • the path that forms the welding torch It is configured to be performed by tilting an angle ⁇ a upward with respect to the horizontal plane.
  • a V groove having a lower groove surface forming an angle ⁇ b with respect to a horizontal plane is formed at a butt portion between aluminum alloy workpieces. I have.
  • the welding torch is passed so as to form a lower bead by filling the lower groove surface of the V groove, the welding torch is inclined at an angle ⁇ b downward with respect to a horizontal plane, so that the welding is performed. Insufficiency of penetration into the lower groove surface can be avoided.
  • the angle ⁇ a of the upper groove surface with respect to the horizontal plane at the V groove is set to be larger than the angle ⁇ b of the lower groove surface with respect to the horizontal plane.
  • the upper bead is formed by filling the meat from the lower bead on the lower groove surface of the V groove to the upper groove surface of the V groove.
  • the welding torch is inclined at an angle ⁇ a upward with respect to the horizontal plane to perform the pass, so that insufficient penetration into the upper groove surface can be avoided.
  • FIG. 1 is an explanatory perspective view showing a horizontal welding device used in a horizontal butt welding method according to an embodiment of the present disclosure.
  • 1 is an enlarged cross-sectional explanatory view of a V groove between materials to be welded joined by a lateral butt welding method according to an embodiment of the present disclosure, as viewed from the direction of a white arrow in FIG. 1.
  • FIG. 2 is an enlarged cross-sectional explanatory view of a V groove of a material to be welded joined by the horizontal welding device of FIG.
  • FIG. 1 shows a horizontal welding apparatus which is a MIG welding machine used in a horizontal butt welding method according to an embodiment of the present disclosure.
  • FIGS. 2 and 3 show a horizontal butt welding method according to an embodiment of the present disclosure. V-groove between aluminum alloy standing wall panels (weld to be welded) to be joined together by means of FIG.
  • the standing wall panels Wu and Wl made of aluminum alloy are panels constituting each standing wall of a block in a self-standing rectangular tank made of aluminum alloy stacked vertically.
  • the horizontal welding device 1 for joining these standing wall panels Wu, Wl includes a rail 2 disposed along a V groove Wv formed between the upper standing wall panel Wu and the lower standing wall panel Wl, and the rail 2 It is provided with a bogie train 3 that moves upward.
  • the bogie train 3 includes a torch bogie 3A located on the forward side (lower left side in the drawing) of the welding direction indicated by the thick black arrow, and a feeder bogie 3B connected to the torch bogie 3A via a pipe 4. .
  • the torch truck 3A has a support 5 moving along a guide 3a arranged in a direction approaching and separating from the upright wall panels Wu, Wl, and a support 5 arranged in a direction (vertical direction) crossing the V groove Wv.
  • Slider 6 that moves up and down along a vertical guide (not shown), a welding torch 7 that is swingably supported in a curved arrow direction via a Weibin mechanism (not shown), and welding to the standing wall panels Wu and Wl.
  • a laser displacement meter 8 for detecting the distance of the torch 7 is mounted.
  • a reel 11 for holding the welding wire 10 in a wound state, and a feeder 13 for sending out the welding wire 10 from the reel 11 and sending it to the welding torch 7 via the conduit liner 12 are mounted on the feeder cart 3B.
  • the horizontal welding device 1 also includes a welding power source 15 for supplying power to the welding torch 7 and the feeder 13, and a grounding connection to the standing wall panels Wu and Wl, and a control unit 16.
  • the control unit 16 controls the operation of a weaving motor (not shown) of the weaving mechanism arranged on the slider 6. In addition, the control unit 16 controls the operation of a drive motor (not shown) of the support base 5 so as to keep the distance between the standing wall panels Wu and Wl detected by the laser displacement meter 8 and the welding torch 7 constant. It has become.
  • the welding torch 7 is integrally provided with a nozzle 7a for injecting the shielding gas G into the V groove Wv, and the hose 21 and the nozzle 7a of the welding torch 7 are connected to each other.
  • the flow rate of the shield gas G from the gas cylinder 17 supplied to the V groove Wv through the control unit 16 is controlled by the control unit 16 according to the gas pressure detected by a gas pressure sensor (not shown).
  • control unit 16 determines the distance between the welding torch 7 and the standing wall panels Wu and Wl and the flow rate of the shielding gas G in advance.
  • a gas supply system including a drive motor (not shown) of the support base 5 and a gas cylinder 17 is controlled so as to keep the calculated predetermined value.
  • the horizontal welding apparatus 1 further includes a welding remote controller 18 for adjusting welding conditions such as a welding speed and a welding current, and a control unit controller 19.
  • the controller 19 controls a plurality of patterns for coping with a change in the root gap Wg of the V groove Wv in addition to welding conditions such as a distance between the welding torch 7 and the standing wall panels Wu and Wl and a flow rate of the shield gas G.
  • the control unit 16 denotes a power cable.
  • the root gap is controlled by a simple button operation of the welding remote controller 18.
  • the welding conditions can be changed to correspond to the change in Wg.
  • the upward opening of the hydrogen gas contained in the shielding gas G generated in the molten metal during welding is promoted in order to promote the upward movement.
  • the angle ⁇ a of the front surface Wa with respect to the horizontal plane is set to be larger than the angle ⁇ b of the lower groove surface Wb with respect to the horizontal plane.
  • the angle ⁇ a of the upper groove surface Wa with respect to the horizontal plane and the angle ⁇ a of the lower is desirably 70 ° or less, and more desirably around 50 °.
  • the bogie train 3 is run along the V groove Wv between the standing wall panels Wu and Wl to start the transverse butt welding.
  • the welding torch 7 is made to pass a plurality of times along the V groove Wv, and the meat is piled up.
  • the welding torch 7 is made horizontal (in a state shown in FIG. 2), 10 is performed after approaching the lower surface Wgb of the route gap Wg.
  • the backside bead Bs is formed on the back side of the V groove Wv by this backside welding.
  • the path for directly filling meat on the lower groove face Wb of the V groove Wv uses the welding torch 7 as shown by a virtual line in FIG.
  • the welding is performed after the welding wire 10 is inclined downward at an angle ⁇ b (around 15 °) with respect to the horizontal plane to approach the lower groove surface Wb of the V groove Wv.
  • a lower bead (a bead with a circle in FIG. 3) is formed on the lower groove surface Wb.
  • the pass for filling the lower bead is performed after the welding torch 7 is horizontal and the welding wire 10 is brought closer to the lower bead.
  • an intermediate bead (a bead indicated by ⁇ in FIG. 3) is formed on the lower bead.
  • the path in which the meat is piled up from these intermediate beads to the upper groove surface Wa of the V groove Wv, as shown by a solid line in FIG. 3, moves the welding torch 7 upward at an angle ⁇ a (about 5 °) with respect to the horizontal plane. It is performed after tilting and bringing the welding wire 10 close to the intermediate bead. As a result, an upper bead (a bead indicated by ⁇ in FIG. 3) is formed on the intermediate bead.
  • the last pass is also performed after the welding torch 7 is inclined upward by an angle ⁇ a with respect to the horizontal plane, and the welding wire 10 is brought closer to the upper bead formed in the previous pass. Thereby, the final bead Be is formed on the upper bead of the previous pass.
  • the upper bead may be directly stacked on the lower bead instead of the intermediate bead. That is, a path for forming an upper bead by filling the meat from the lower bead formed on the lower groove surface Wb of the V groove Wv to the upper groove surface Wa of the V groove Wv is formed by a welding torch 7 with respect to a horizontal plane. At an angle ⁇ a upward.
  • the V groove having the lower groove surface Wb at an angle ⁇ b with respect to the horizontal plane is provided at the butt portion between the vertical wall panels Wu and Wl made of aluminum alloy. Wv is formed.
  • the welding torch 7 is passed so as to directly fill the lower groove surface Wb of the V groove Wv, the welding torch 7 is tilted downward by an angle ⁇ b with respect to a horizontal plane. Insufficiency of penetration into the side groove surface Wb is avoided.
  • the angle ⁇ a of the upper groove surface Wa with respect to the horizontal plane at the V groove Wv is set to be larger than the angle ⁇ b of the lower groove surface Wb with respect to the horizontal plane, the angle ⁇ a is included in the shielding gas G generated in the molten metal. The upward movement of the hydrogen bubbles is promoted, and blow holes are not left in the welded portion.
  • the upper bead is formed by filling the meat from the lower bead on the lower groove surface Wb of the V groove Wv to the upper groove surface Wa of the V groove Wv.
  • the welding torch 7 is inclined at an angle ⁇ a upward with respect to the horizontal plane to carry out the pass, so that insufficient penetration into the upper groove surface Wa is also avoided.
  • the sum of the angles ⁇ a and ⁇ b formed by the upper groove surface Wa and the lower groove surface Wb of the V groove Wv with the horizontal plane is 70 ° or less, so that the aluminum
  • Wl made of an alloy an appropriate amount of the welding wire 10 can be melted as a weld metal into the V groove Wv while suppressing the occurrence of welding defects such as insufficient penetration and blow holes. It will be.
  • the configuration of the lateral butt welding method according to the present disclosure is not limited to the configuration of the above-described embodiment, and as another configuration, for example, an ultrasonic sensor may be used instead of the laser displacement meter 8.
  • a first aspect of the present disclosure is directed to a horizontal butt welding method in which aluminum alloy workpieces supported side by side are butt-joined to each other, and a lateral V groove is formed at a butt portion between the workpieces.
  • the angle ⁇ a formed by the upper groove surface of the V groove with respect to the horizontal plane is set to be larger than the angle ⁇ b formed by the lower groove surface of the V groove with respect to the horizontal plane, and the welding torch is moved along the V groove.
  • the first pass at the time of filling the meat by passing it a plurality of times while weaving is performed with the welding torch horizontal, and thereafter, the pass of filling the meat directly on the lower groove face of the V groove is the welding.
  • the torch is inclined at an angle ⁇ b downward with respect to the horizontal plane, and the meat is piled up from the lower bead on the lower groove surface of the V groove to the upper groove surface of the V groove.
  • the path that forms the welding torch It is configured to be performed by tilting an angle ⁇ a upward with respect to the horizontal plane.
  • a V groove having a lower groove surface forming an angle ⁇ b with respect to a horizontal plane is formed at a butt portion between aluminum alloy workpieces. I have.
  • the welding torch is passed so as to form a lower bead by filling the lower groove surface of the V groove, the welding torch is inclined at an angle ⁇ b downward with respect to a horizontal plane, so that the welding is performed. Insufficiency of penetration into the lower groove surface can be avoided.
  • the angle ⁇ a of the upper groove surface with respect to the horizontal plane at the V groove is set to be larger than the angle ⁇ b of the lower groove surface with respect to the horizontal plane.
  • the upper bead is formed by filling the meat from the lower bead on the lower groove surface of the V groove to the upper groove surface of the V groove.
  • the welding torch is inclined at an angle ⁇ a upward with respect to the horizontal plane to perform the pass, so that insufficient penetration into the upper groove surface can be avoided.
  • the intermediate bead is formed by filling the lower bead on the lower groove surface of the V groove
  • a pass is performed with the welding torch horizontal.
  • a path for forming the upper bead by filling the meat from the intermediate bead to the upper groove surface of the V groove is performed by inclining the welding torch at an angle ⁇ a with respect to a horizontal plane.
  • the sum of an angle ⁇ a formed by the upper groove surface of the V groove and a horizontal plane and an angle ⁇ b formed by the lower groove surface of the V groove and a horizontal plane is as follows.
  • the angle is set to 70 ° or less.
  • the sum of the angles ⁇ a and ⁇ b formed by the upper groove surface and the lower groove surface of the V groove with the horizontal plane is 70 ° or less, and therefore, the aluminum alloy When performing lateral welding on a workpiece to be welded, defects such as blowholes can be more reliably suppressed.

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Abstract

A V groove Wv is formed in an abutting portion between aluminum alloy vertical wall panels Wu, Wl that are supported side-by-side in the vertical direction. An angle θa, formed by an upper groove face Wa with respect to the horizontal plane, is set to be larger than an angle θb, formed by a lower groove face Wb with respect to the horizontal plane. A first pass when building up along the V groove Wv by making multiple passes while weaving the weld torch 7 is executed by a weld torch 7 being horizontal. Subsequently, passes to build up directly on the lower groove face Wb are executed by inclining the weld torch 7 at an angle αb under the horizontal plane, passes to build up on a bottom side bead built on the lower groove face Wb are executed with the weld torch 7 being horizontal, and passes to build up from an intermediate bead overlapping the bottom side bead toward the upper groove face Wa are executed by inclining the weld torch 7 at an angle αa above the horizontal plane. Thus, it is possible to carry out horizontal butt welding with respect to an aluminum alloy without occurrences of weld defects.

Description

横向き突き合わせ溶接方法Lateral butt welding method
　本開示は、大型構造物、例えば、タンカーに搭載される自立角型タンク（Self-supporting, Prismatic-shape IMO type B（自立角型IMOタイプBタンク））を製造する際に用いられる横向き突き合わせ溶接方法に関するものである。 The present disclosure relates to a horizontal butt welding used in manufacturing a large-sized structure, for example, a self-supporting square tank (Self-supporting, {Prismatic-shape} IMO type B) mounted on a tanker. It is about the method.
　上記した自立角型タンクとしては、船体の形状に合わせて製造されるアルミ合金製のタンクがあり、このような自立角型タンクは、個々に製造される多数のブロックから構成されている。これらの多数のブロックの製造は、その大半がアルミ合金製の大型パネル（例えば１６ｍ角の大型パネル；被溶接材）同士のＭＩＧ溶接による突き合わせ接合から開始される。 自 As the self-standing square tank described above, there is an aluminum alloy tank manufactured according to the shape of the hull, and such a self-standing square tank is composed of a large number of individually manufactured blocks. The manufacture of many of these blocks starts with butt joining of large panels made of aluminum alloy (for example, large panels of 16 m square; material to be welded) by MIG welding.
　そして、最終的には、個々に製造されたブロック同士を接合して自立角型タンクを得るが、この最終段階における上下に積まれたブロック同士の突き合わせ接合には、横向き姿勢での突き合わせ溶接が実施される。 Finally, the individually manufactured blocks are joined together to obtain a self-supporting square tank, but in the final stage, butt welding of the vertically stacked blocks involves butt welding in a horizontal position. Will be implemented.
　従来において、上記したブロック同士の突き合わせ接合に採用される横向き突き合わせ溶接方法としては、例えば、特許文献１に記載された横向き自動溶接法がある。
　この横向き自動溶接法では、上下に積まれたブロックの各立壁パネル間にレ開先を形成し、ウィービング機構を装備した台車に溶接トーチを搭載して、ウィービング動作する溶接トーチに溶接ワイヤを供給しつつ、台車をレ開先に沿って走行さて横向き溶接を行うようにしている。 Conventionally, as a lateral butt welding method adopted for the butt joining of the blocks described above, there is, for example, a horizontal automatic welding method described in Patent Document 1.
In this horizontal automatic welding method, a groove is formed between the standing wall panels of the vertically stacked blocks, a welding torch is mounted on a bogie equipped with a weaving mechanism, and a welding wire is supplied to the welding torch that operates weaving In addition, the bogie is moved along the groove to perform lateral welding.
　この際、アルミ合金に対する溶接は、溶接対象がアルミ合金であるが故にブローホールや溶け落ち等の溶接欠陥が生じやすい。
　そこで、上記した従来の横向き自動溶接法では、レ開先のほぼ水平な下側開先面（下側ブロックにおける立壁パネルの端面）と溶接トーチ（溶接ワイヤ）とが成す角度を０～３０°に設定してウィービング動作を行わせることで、レ開先内にビードを盛るようにしている。 At this time, in welding to an aluminum alloy, welding defects such as blow holes and burn-through easily occur because the welding target is an aluminum alloy.
Therefore, in the above-mentioned conventional horizontal automatic welding method, the angle formed by the substantially horizontal lower groove surface of the groove (the end surface of the standing wall panel in the lower block) and the welding torch (welding wire) is 0 to 30 °. By setting to, weaving operation is performed so that beads are piled in the groove.
特開昭６０－１３０４７８号公報JP-A-60-130478
　ところが、上記した従来の横向き自動溶接法にあっては、上述したようにアルミ合金製におけるブロックの各立壁パネル同士を接合するに際して、良好なビード形状を得るべく、レ開先の下側開先面と溶接トーチとが成す角度を０～３０°に設定してウィービング動作を行わせるようにしているが、レ開先の下側開先面に溶け込み不足やブローホール等の溶接欠陥が生じてしまうのが現実であり、この問題を解決することが従来の課題となっていた。 However, in the conventional horizontal automatic welding method described above, when joining the respective standing wall panels of the block made of aluminum alloy as described above, in order to obtain a good bead shape, the lower groove of the groove is formed. Weaving operation is performed by setting the angle between the surface and the welding torch to be 0 to 30 °. However, welding defects such as insufficient penetration and blow holes occur on the lower groove surface of the groove. It is a reality, and solving this problem has been a conventional problem.
　本開示は、上記した従来の課題に着目してなされたもので、溶接欠陥を生じさせることなくアルミ合金に対する横向き突き合わせ溶接を行うことが可能である横向き突き合わせ溶接方法を提供することを目的としている。 The present disclosure has been made in view of the above-described conventional problems, and has as its object to provide a horizontal butt welding method capable of performing a horizontal butt welding to an aluminum alloy without causing a welding defect. .
　本開示の第１の態様は、上下に並べて支持されたアルミ合金製の被溶接材同士を突き合わせて接合する横向き突き合わせ溶接方法において、前記被溶接材間の突き合わせ部に横向きのＶ開先を形成し、水平面に対する前記Ｖ開先の上側開先面の成す角度θａを水平面に対する前記Ｖ開先の下側開先面の成す角度θｂよりも大きく設定し、前記Ｖ開先に沿って溶接トーチをウィービングさせつつ複数回パスさせて肉を盛る際の最初のパスは該溶接トーチを水平にして実施し、以降、前記Ｖ開先の前記下側開先面に直に肉を盛るパスは前記溶接トーチを水平面に対して下方に角度αｂ傾けて実施し、前記Ｖ開先の前記下側開先面に盛った下側ビードから前記Ｖ開先の前記上側開先面にかけて肉を盛って上側ビードを形成するパスは前記溶接トーチを水平面に対して上方に角度αａ傾けて実施する構成としている。 A first aspect of the present disclosure is directed to a horizontal butt welding method in which aluminum alloy workpieces supported side by side are butt-joined to each other, and a lateral V groove is formed at a butt portion between the workpieces. The angle θa formed by the upper groove surface of the V groove with respect to the horizontal plane is set to be larger than the angle θb formed by the lower groove surface of the V groove with respect to the horizontal plane, and the welding torch is moved along the V groove. The first pass at the time of filling the meat by passing it a plurality of times while weaving is performed with the welding torch horizontal, and thereafter, the pass of filling the meat directly on the lower groove face of the V groove is the welding. The torch is inclined at an angle αb downward with respect to the horizontal plane, and the meat is piled up from the lower bead on the lower groove surface of the V groove to the upper groove surface of the V groove. The path that forms the welding torch It is configured to be performed by tilting an angle αa upward with respect to the horizontal plane.
　本開示の第１の態様に係る横向き突き合わせ溶接方法において、アルミ合金製の被溶接材間の突き合わせ部に、水平面に対して角度θｂを成す下側開先面を有するＶ開先が形成されている。そのうえ、このＶ開先の下側開先面に肉を盛って下側ビードを形成するべく溶接トーチをパスさせる場合に、この溶接トーチを水平面に対して下方に角度αｂ傾けて実施するので、下側開先面に溶け込み不足が生じることが回避されることとなる。 In the lateral butt welding method according to the first aspect of the present disclosure, a V groove having a lower groove surface forming an angle θb with respect to a horizontal plane is formed at a butt portion between aluminum alloy workpieces. I have. In addition, when the welding torch is passed so as to form a lower bead by filling the lower groove surface of the V groove, the welding torch is inclined at an angle αb downward with respect to a horizontal plane, so that the welding is performed. Insufficiency of penetration into the lower groove surface can be avoided.
　この際、Ｖ開先における上側開先面の水平面に対する角度θａは、下側開先面の水平面に対する角度θｂよりも大きく設定されているので、例えば、溶接部分にシールドガスを供給する場合、溶融金属中に発生するシールドガスに含まれる水素の気泡の上方への移動が促進されて、溶接部分にブローホールが残ることも回避されることとなる。 At this time, the angle θa of the upper groove surface with respect to the horizontal plane at the V groove is set to be larger than the angle θb of the lower groove surface with respect to the horizontal plane. The upward movement of the bubbles of hydrogen contained in the shielding gas generated in the metal is promoted, and blow holes are not left in the welded portion.
　加えて、本開示の第１の態様に係る横向き突き合わせ溶接方法では、Ｖ開先の下側開先面に盛った下側ビードからＶ開先の上側開先面にかけて肉を盛って上側ビードを形成する場合に、溶接トーチを水平面に対して上方に角度αａ傾けてパスを実施するので、上側開先面に溶け込み不足が生じることも回避されることとなる。 In addition, in the lateral butt welding method according to the first aspect of the present disclosure, the upper bead is formed by filling the meat from the lower bead on the lower groove surface of the V groove to the upper groove surface of the V groove. When forming, the welding torch is inclined at an angle αa upward with respect to the horizontal plane to perform the pass, so that insufficient penetration into the upper groove surface can be avoided.
　本開示に係る横向き突き合わせ溶接方法において、溶接欠陥を生じさせることなくアルミ合金に対する横向き突き合わせ溶接を行うことが可能であるという非常に優れた効果がもたらされる。 (4) In the lateral butt welding method according to the present disclosure, a very excellent effect that lateral butt welding can be performed on an aluminum alloy without causing a welding defect is provided.
本開示の一実施例に係る横向き突き合わせ溶接方法に用いられる横向き溶接装置を示す斜視説明図である。1 is an explanatory perspective view showing a horizontal welding device used in a horizontal butt welding method according to an embodiment of the present disclosure. 本開示の一実施例に係る横向き突き合わせ溶接方法により接合される被溶接材間のＶ開先を図１白抜き矢印方向から見た拡大断面説明図である。1 is an enlarged cross-sectional explanatory view of a V groove between materials to be welded joined by a lateral butt welding method according to an embodiment of the present disclosure, as viewed from the direction of a white arrow in FIG. 1. 図１の横向き溶接装置により接合された被溶接材のＶ開先を図１白抜き矢印方向から見た拡大断面説明図である。FIG. 2 is an enlarged cross-sectional explanatory view of a V groove of a material to be welded joined by the horizontal welding device of FIG.
　以下、本開示を図面に基づいて説明する。
　図１は、本開示の一実施例に係る横向き突き合わせ溶接方法に用いられるＭＩＧ溶接機である横向き溶接装置を示しており、図２，３は、本開示の一実施例に係る横向き突き合わせ溶接方法により接合されるアルミ合金製の立壁パネル（被溶接材）間のＶ開先を示している。 Hereinafter, the present disclosure will be described with reference to the drawings.
FIG. 1 shows a horizontal welding apparatus which is a MIG welding machine used in a horizontal butt welding method according to an embodiment of the present disclosure. FIGS. 2 and 3 show a horizontal butt welding method according to an embodiment of the present disclosure. V-groove between aluminum alloy standing wall panels (weld to be welded) to be joined together by means of FIG.
　図１に示すように、アルミ合金製の立壁パネルＷｕ，Ｗｌは、上下に積まれたアルミ合金製の自立角型タンクにおけるブロックの各立壁を構成するパネルである。これらの立壁パネルＷｕ，Ｗｌを接合する横向き溶接装置１は、上側の立壁パネルＷｕ及び下側の立壁パネルＷｌ間に形成されたＶ開先Ｗｖに沿って配置されるレール２と、このレール２上を移動する台車列３を備えている。この台車列３は、黒太矢印で示す溶接方向の前進側（図示左下側）に位置するトーチ台車３Ａ及びこのトーチ台車３Ａにパイプ４を介して連結されているフィーダ台車３Ｂを具備している。 (1) As shown in FIG. 1, the standing wall panels Wu and Wl made of aluminum alloy are panels constituting each standing wall of a block in a self-standing rectangular tank made of aluminum alloy stacked vertically. The horizontal welding device 1 for joining these standing wall panels Wu, Wl includes a rail 2 disposed along a V groove Wv formed between the upper standing wall panel Wu and the lower standing wall panel Wl, and the rail 2 It is provided with a bogie train 3 that moves upward. The bogie train 3 includes a torch bogie 3A located on the forward side (lower left side in the drawing) of the welding direction indicated by the thick black arrow, and a feeder bogie 3B connected to the torch bogie 3A via a pipe 4. .
　トーチ台車３Ａには、立壁パネルＷｕ，Ｗｌに接近離間する方向に配置されたガイド３ａに沿って移動する支持台５と、この支持台５にＶ開先Ｗｖを横切る方向（上下方向）に配置された図示しない縦ガイドに沿って上下動するスライダ６と、このスライダ６に図示しないウィービン機構を介して湾曲矢印方向に揺動可能に支持される溶接トーチ７と、立壁パネルＷｕ，Ｗｌに対する溶接トーチ７の距離を検出するレーザ変位計８が搭載されている。 The torch truck 3A has a support 5 moving along a guide 3a arranged in a direction approaching and separating from the upright wall panels Wu, Wl, and a support 5 arranged in a direction (vertical direction) crossing the V groove Wv. Slider 6 that moves up and down along a vertical guide (not shown), a welding torch 7 that is swingably supported in a curved arrow direction via a Weibin mechanism (not shown), and welding to the standing wall panels Wu and Wl. A laser displacement meter 8 for detecting the distance of the torch 7 is mounted.
　一方、フィーダ台車３Ｂには、溶接ワイヤ１０を巻き付け状態で保持するリール１１と、このリール１１から溶接ワイヤ１０を送り出してコンジットライナ１２を介して溶接トーチ７に送るフィーダ１３が搭載されている。 On the other hand, a reel 11 for holding the welding wire 10 in a wound state, and a feeder 13 for sending out the welding wire 10 from the reel 11 and sending it to the welding torch 7 via the conduit liner 12 are mounted on the feeder cart 3B.
　また、この横向き溶接装置１は、溶接トーチ７及びフィーダ１３に電源を供給すると共に、立壁パネルＷｕ，Ｗｌにアース接続する溶接電源１５と、制御部１６を備えている。 The horizontal welding device 1 also includes a welding power source 15 for supplying power to the welding torch 7 and the feeder 13, and a grounding connection to the standing wall panels Wu and Wl, and a control unit 16.
　制御部１６は、スライダ６に配置したウィービン機構の図示しないウィービン用モータの動作を制御する。加えて、制御部１６は、レーザ変位計８で検出する立壁パネルＷｕ，Ｗｌと溶接トーチ７との間の距離を一定に保持するように、支持台５の図示しない駆動モータの動作を制御するようになっている。 The control unit 16 controls the operation of a weaving motor (not shown) of the weaving mechanism arranged on the slider 6. In addition, the control unit 16 controls the operation of a drive motor (not shown) of the support base 5 so as to keep the distance between the standing wall panels Wu and Wl detected by the laser displacement meter 8 and the welding torch 7 constant. It has become.
　この場合、溶接トーチ７には、図２に示すように、Ｖ開先Ｗｖ内に向けてシールドガスＧを噴射するノズル７ａが一体に設けられており、ホース２１及び溶接トーチ７のノズル７ａを介してＶ開先Ｗｖに供給されるガスボンベ１７からのシールドガスＧの流量は、図外のガス圧力センサで検出するガス圧に応じて制御部１６により制御されるようになっている。 In this case, as shown in FIG. 2, the welding torch 7 is integrally provided with a nozzle 7a for injecting the shielding gas G into the V groove Wv, and the hose 21 and the nozzle 7a of the welding torch 7 are connected to each other. The flow rate of the shield gas G from the gas cylinder 17 supplied to the V groove Wv through the control unit 16 is controlled by the control unit 16 according to the gas pressure detected by a gas pressure sensor (not shown).
　つまり、制御部１６では、立壁パネルＷｕ，Ｗｌ間に形成されたＶ開先Ｗｖに対して溶接を行う際に、溶接トーチ７と立壁パネルＷｕ，Ｗｌとの距離及びシールドガスＧの流量をあらかじめ算出した所定の値に保つように、支持台５の図示しない駆動モータ及びガスボンベ１７を含むガス供給系を制御するようになっている。 That is, when performing welding on the V groove Wv formed between the standing wall panels Wu and Wl, the control unit 16 determines the distance between the welding torch 7 and the standing wall panels Wu and Wl and the flow rate of the shielding gas G in advance. A gas supply system including a drive motor (not shown) of the support base 5 and a gas cylinder 17 is controlled so as to keep the calculated predetermined value.
　さらに、この横向き溶接装置１は、溶接速度や溶接電流等の溶接条件を調整するための溶接リモコン１８と、制御部コントローラ１９を備えている。制御部コントローラ１９は、上記溶接トーチ７と立壁パネルＷｕ，Ｗｌとの距離及びシールドガスＧの流量等の溶接条件に加えて、Ｖ開先ＷｖのルートギャップＷｇの変化に対応するための複数パターンの溶接条件を制御部１６に入力する。なお、図１における符号２０は電源ケーブルである。 The horizontal welding apparatus 1 further includes a welding remote controller 18 for adjusting welding conditions such as a welding speed and a welding current, and a control unit controller 19. The controller 19 controls a plurality of patterns for coping with a change in the root gap Wg of the V groove Wv in addition to welding conditions such as a distance between the welding torch 7 and the standing wall panels Wu and Wl and a flow rate of the shield gas G. Are input to the control unit 16. Note that reference numeral 20 in FIG. 1 denotes a power cable.
　この実施例では、例えば、溶接中において、Ｖ開先ＷｖのルートギャップＷｇが比較的大きく変化している部位に溶接トーチ７が差し掛かる際に、溶接リモコン１８の簡単なボタン操作で、ルートギャップＷｇの変化に対応する溶接条件に変更することができるようにしている。 In this embodiment, for example, during welding, when the welding torch 7 approaches a portion where the root gap Wg of the V groove Wv is relatively large, the root gap is controlled by a simple button operation of the welding remote controller 18. The welding conditions can be changed to correspond to the change in Wg.
　ここで、立壁パネルＷｕ，Ｗｌ間に形成された横向きのＶ開先Ｗｖにおいて、溶接中に溶融金属に発生するシールドガスＧに含まれる水素の気泡の上方への移動を促すうえで、上側開先面Ｗａの水平面に対する角度θａを下側開先面Ｗｂの水平面に対する角度θｂよりも大きく設定している。 Here, in the lateral V groove Wv formed between the standing wall panels Wu and Wl, the upward opening of the hydrogen gas contained in the shielding gas G generated in the molten metal during welding is promoted in order to promote the upward movement. The angle θa of the front surface Wa with respect to the horizontal plane is set to be larger than the angle θb of the lower groove surface Wb with respect to the horizontal plane.
　この際、溶け込み不足やブローホール等の溶接欠陥の発生を抑えつつ、適量の溶接ワイヤ１０を溶接金属としてＶ開先Ｗｖに溶け込ませるために、上側開先面Ｗａの水平面に対する角度θａと、下側開先面Ｗｂの水平面に対する角度θｂとの合計を７０°以下とすることが望ましく、５０°前後とすることがより望ましい。 At this time, the angle θa of the upper groove surface Wa with respect to the horizontal plane and the angle θa of the lower The sum of the angle θb of the side groove surface Wb and the horizontal plane is desirably 70 ° or less, and more desirably around 50 °.
　次に、上記横向き溶接装置１を用いて、アルミ合金製の立壁パネルＷｕ，Ｗｌ同士を突き合わせ接合する要領を説明する。 Next, a description will be given of a method of butt-joining the standing wall panels Wu and Wl made of aluminum alloy using the horizontal welding apparatus 1.
　まず、上下に並べて支持されたアルミ合金製の立壁パネルＷｕ，Ｗｌ同士を複数個所で溶接により仮付けする。 {Circle over (1)} First, the aluminum alloy standing wall panels Wu and Wl supported side by side up and down are temporarily attached by welding at a plurality of locations.
　この後、溶接トーチ７をウィービングさせつつ、立壁パネルＷｕ，Ｗｌ間のＶ開先Ｗｖに沿って台車列３を走行させて、横向き突き合わせ溶接を開始する。 後 Thereafter, while the welding torch 7 is being weaved, the bogie train 3 is run along the V groove Wv between the standing wall panels Wu and Wl to start the transverse butt welding.
　この横向き突き合わせ溶接では、Ｖ開先Ｗｖに沿って溶接トーチ７を複数回パスさせて肉を盛るが、最初のパスは、溶接トーチ７を水平にして（図２に示す状態で）、溶接ワイヤ１０をルートギャップＷｇの下側面Ｗｇｂに近づけてから実施する。この裏波溶接により、図３に示すように、Ｖ開先Ｗｖの裏側に裏波ビードＢｓが形成される。 In this horizontal butt welding, the welding torch 7 is made to pass a plurality of times along the V groove Wv, and the meat is piled up. In the first pass, the welding torch 7 is made horizontal (in a state shown in FIG. 2), 10 is performed after approaching the lower surface Wgb of the route gap Wg. As shown in FIG. 3, the backside bead Bs is formed on the back side of the V groove Wv by this backside welding.
　これに続く裏波ビードＢｓ上に肉を盛るパスのうち、Ｖ開先Ｗｖの下側開先面Ｗｂに直に肉を盛るパスは、図３に仮想線で示すように、溶接トーチ７を水平面に対して下方に角度αｂ（１５°前後）傾けて、溶接ワイヤ１０をＶ開先Ｗｖの下側開先面Ｗｂに近づけてから実施する。これによって、下側開先面Ｗｂ上に下側ビード（図３において●を付したビード）が形成される。 Of the subsequent paths for filling meat on the Uranami bead Bs, the path for directly filling meat on the lower groove face Wb of the V groove Wv uses the welding torch 7 as shown by a virtual line in FIG. The welding is performed after the welding wire 10 is inclined downward at an angle αb (around 15 °) with respect to the horizontal plane to approach the lower groove surface Wb of the V groove Wv. As a result, a lower bead (a bead with a circle in FIG. 3) is formed on the lower groove surface Wb.
　また、これらの下側ビードに肉を盛るパスは、溶接トーチ７を水平にして、溶接ワイヤ１０を下側ビードに近づけてから実施する。これにより、下側ビード上に中間ビード（図３において〇を付したビード）が形成される。 パ ス Also, the pass for filling the lower bead is performed after the welding torch 7 is horizontal and the welding wire 10 is brought closer to the lower bead. As a result, an intermediate bead (a bead indicated by 〇 in FIG. 3) is formed on the lower bead.
　さらに、これらの中間ビードからＶ開先Ｗｖの上側開先面Ｗａにかけて肉を盛るパスは、図３に実線で示すように、溶接トーチ７を水平面に対して上方に角度αａ（５°前後）傾けて、溶接ワイヤ１０を中間ビードに近づけてから実施する。これにより、中間ビード上に上側ビード（図３において△を付したビード）が形成される。 In addition, the path in which the meat is piled up from these intermediate beads to the upper groove surface Wa of the V groove Wv, as shown by a solid line in FIG. 3, moves the welding torch 7 upward at an angle αa (about 5 °) with respect to the horizontal plane. It is performed after tilting and bringing the welding wire 10 close to the intermediate bead. As a result, an upper bead (a bead indicated by △ in FIG. 3) is formed on the intermediate bead.
　そして、この実施例では、最後のパスも、溶接トーチ７を水平面に対して上方に角度αａ傾けて、溶接ワイヤ１０を前パスで盛った上側ビードに近づけてから実施する。これにより、前パスの上側ビード上に最終ビードＢｅが形成される。 In this embodiment, the last pass is also performed after the welding torch 7 is inclined upward by an angle αa with respect to the horizontal plane, and the welding wire 10 is brought closer to the upper bead formed in the previous pass. Thereby, the final bead Be is formed on the upper bead of the previous pass.
　なお、立壁パネルＷｕ，Ｗｌの肉厚が薄く、Ｖ開先Ｗｖの開先幅が狭い場合は、下側ビードに中間ビードを盛らずに直接上側ビードを重ねて盛ってもよい。すなわち、Ｖ開先Ｗｖの下側開先面Ｗｂに盛った下側ビードからＶ開先Ｗｖの上側開先面Ｗａにかけて肉を盛って上側ビードを形成するパスを、水平面に対して溶接トーチ７を上方に角度αａ傾けて実施する。 In the case where the vertical wall panels Wu and Wl are thin and the groove width of the V groove Wv is narrow, the upper bead may be directly stacked on the lower bead instead of the intermediate bead. That is, a path for forming an upper bead by filling the meat from the lower bead formed on the lower groove surface Wb of the V groove Wv to the upper groove surface Wa of the V groove Wv is formed by a welding torch 7 with respect to a horizontal plane. At an angle αa upward.
　本実施例に係る横向き突き合わせ溶接方法において、上記したように、アルミ合金製の立壁パネルＷｕ，Ｗｌ間の突き合わせ部に、水平面に対して角度θｂを成す下側開先面Ｗｂを有するＶ開先Ｗｖが形成されている。そのうえ、このＶ開先Ｗｖの下側開先面Ｗｂに直に肉を盛るべく溶接トーチ７をパスさせる場合に、この溶接トーチ７を水平面に対して下方に角度αｂ傾けて実施するので、下側開先面Ｗｂに溶け込み不足が生じることが回避されることとなる。 In the horizontal butt welding method according to the present embodiment, as described above, the V groove having the lower groove surface Wb at an angle θb with respect to the horizontal plane is provided at the butt portion between the vertical wall panels Wu and Wl made of aluminum alloy. Wv is formed. In addition, when the welding torch 7 is passed so as to directly fill the lower groove surface Wb of the V groove Wv, the welding torch 7 is tilted downward by an angle αb with respect to a horizontal plane. Insufficiency of penetration into the side groove surface Wb is avoided.
　また、Ｖ開先Ｗｖにおける上側開先面Ｗａの水平面に対する角度θａは、下側開先面Ｗｂの水平面に対する角度θｂよりも大きく設定されているので、溶融金属中に発生するシールドガスＧに含まれる水素の気泡の上方への移動が促進されて、溶接部分にブローホールが残ることも回避されることとなる。 Since the angle θa of the upper groove surface Wa with respect to the horizontal plane at the V groove Wv is set to be larger than the angle θb of the lower groove surface Wb with respect to the horizontal plane, the angle θa is included in the shielding gas G generated in the molten metal. The upward movement of the hydrogen bubbles is promoted, and blow holes are not left in the welded portion.
　加えて、本実施例に係る横向き突き合わせ溶接方法では、Ｖ開先Ｗｖの下側開先面Ｗｂに盛った下側ビードからＶ開先Ｗｖの上側開先面Ｗａにかけて肉を盛って上側ビードを形成する場合に、溶接トーチ７を水平面に対して上方に角度αａ傾けてパスを実施するので、上側開先面Ｗａに溶け込み不足が生じることも回避されることとなる。 In addition, in the horizontal butt welding method according to the present embodiment, the upper bead is formed by filling the meat from the lower bead on the lower groove surface Wb of the V groove Wv to the upper groove surface Wa of the V groove Wv. When forming, the welding torch 7 is inclined at an angle αa upward with respect to the horizontal plane to carry out the pass, so that insufficient penetration into the upper groove surface Wa is also avoided.
　また、本実施例に係る横向き突き合わせ溶接方法では、下側ビードに肉を盛って中間ビードを形成する場合も、上下の開先面Ｗａ，Ｗｂに溶け込み不足が生じること、及び、溶接部分にブローホールが残ることのいずれもが回避されることとなる。 Further, in the lateral butt welding method according to the present embodiment, even when the intermediate bead is formed by filling the lower bead, insufficient penetration occurs in the upper and lower groove surfaces Wa and Wb, and the blow is generated in the welded portion. Any of the remaining holes will be avoided.
　さらに、本実施例に係る横向き突き合わせ溶接方法では、Ｖ開先Ｗｖの上側開先面Ｗａ及び下側開先面Ｗｂがそれぞれ水平面と成す角度θａ，θｂの合計を７０°以下としているので、アルミ合金製の立壁パネルＷｕ，Ｗｌに対して横向き溶接を行う場合に、溶け込み不足やブローホール等の溶接欠陥の発生を抑えつつ、適量の溶接ワイヤ１０を溶接金属としてＶ開先Ｗｖに溶け込ませ得ることとなる。 Further, in the horizontal butt welding method according to the present embodiment, the sum of the angles θa and θb formed by the upper groove surface Wa and the lower groove surface Wb of the V groove Wv with the horizontal plane is 70 ° or less, so that the aluminum When performing horizontal welding to the vertical wall panels Wu, Wl made of an alloy, an appropriate amount of the welding wire 10 can be melted as a weld metal into the V groove Wv while suppressing the occurrence of welding defects such as insufficient penetration and blow holes. It will be.
　なお、上記した実施例では、本開示に係る横向き突き合わせ溶接方法により、アルミ合金製のブロックにおける立壁パネルＷｕ，Ｗｌ同士を接合する場合を例に挙げて説明したが、被溶接材はパネルに限定されない。 In the above-described embodiment, the case where the vertical wall panels Wu and Wl in the aluminum alloy block are joined to each other by the lateral butt welding method according to the present disclosure has been described as an example, but the material to be welded is limited to the panel. Not done.
　本開示に係る横向き突き合わせ溶接方法の構成は、上記した実施例の構成に限定されるものではなく、他の構成として、例えば、レーザ変位計８に替えて超音波センサを採用してもよい。 The configuration of the lateral butt welding method according to the present disclosure is not limited to the configuration of the above-described embodiment, and as another configuration, for example, an ultrasonic sensor may be used instead of the laser displacement meter 8.
　本開示の第１の態様は、上下に並べて支持されたアルミ合金製の被溶接材同士を突き合わせて接合する横向き突き合わせ溶接方法において、前記被溶接材間の突き合わせ部に横向きのＶ開先を形成し、水平面に対する前記Ｖ開先の上側開先面の成す角度θａを水平面に対する前記Ｖ開先の下側開先面の成す角度θｂよりも大きく設定し、前記Ｖ開先に沿って溶接トーチをウィービングさせつつ複数回パスさせて肉を盛る際の最初のパスは該溶接トーチを水平にして実施し、以降、前記Ｖ開先の前記下側開先面に直に肉を盛るパスは前記溶接トーチを水平面に対して下方に角度αｂ傾けて実施し、前記Ｖ開先の前記下側開先面に盛った下側ビードから前記Ｖ開先の前記上側開先面にかけて肉を盛って上側ビードを形成するパスは前記溶接トーチを水平面に対して上方に角度αａ傾けて実施する構成としている。 A first aspect of the present disclosure is directed to a horizontal butt welding method in which aluminum alloy workpieces supported side by side are butt-joined to each other, and a lateral V groove is formed at a butt portion between the workpieces. The angle θa formed by the upper groove surface of the V groove with respect to the horizontal plane is set to be larger than the angle θb formed by the lower groove surface of the V groove with respect to the horizontal plane, and the welding torch is moved along the V groove. The first pass at the time of filling the meat by passing it a plurality of times while weaving is performed with the welding torch horizontal, and thereafter, the pass of filling the meat directly on the lower groove face of the V groove is the welding. The torch is inclined at an angle αb downward with respect to the horizontal plane, and the meat is piled up from the lower bead on the lower groove surface of the V groove to the upper groove surface of the V groove. The path that forms the welding torch It is configured to be performed by tilting an angle αa upward with respect to the horizontal plane.
　本開示の第１の態様に係る横向き突き合わせ溶接方法において、アルミ合金製の被溶接材間の突き合わせ部に、水平面に対して角度θｂを成す下側開先面を有するＶ開先が形成されている。そのうえ、このＶ開先の下側開先面に肉を盛って下側ビードを形成するべく溶接トーチをパスさせる場合に、この溶接トーチを水平面に対して下方に角度αｂ傾けて実施するので、下側開先面に溶け込み不足が生じることが回避されることとなる。 In the lateral butt welding method according to the first aspect of the present disclosure, a V groove having a lower groove surface forming an angle θb with respect to a horizontal plane is formed at a butt portion between aluminum alloy workpieces. I have. In addition, when the welding torch is passed so as to form a lower bead by filling the lower groove surface of the V groove, the welding torch is inclined at an angle αb downward with respect to a horizontal plane, so that the welding is performed. Insufficiency of penetration into the lower groove surface can be avoided.
　この際、Ｖ開先における上側開先面の水平面に対する角度θａは、下側開先面の水平面に対する角度θｂよりも大きく設定されているので、例えば、溶接部分にシールドガスを供給する場合、溶融金属中に発生するシールドガスに含まれる水素の気泡の上方への移動が促進されて、溶接部分にブローホールが残ることも回避されることとなる。 At this time, the angle θa of the upper groove surface with respect to the horizontal plane at the V groove is set to be larger than the angle θb of the lower groove surface with respect to the horizontal plane. The upward movement of the bubbles of hydrogen contained in the shielding gas generated in the metal is promoted, and blow holes are not left in the welded portion.
　加えて、本開示の第１の態様に係る横向き突き合わせ溶接方法では、Ｖ開先の下側開先面に盛った下側ビードからＶ開先の上側開先面にかけて肉を盛って上側ビードを形成する場合に、溶接トーチを水平面に対して上方に角度αａ傾けてパスを実施するので、上側開先面に溶け込み不足が生じることも回避されることとなる。 In addition, in the lateral butt welding method according to the first aspect of the present disclosure, the upper bead is formed by filling the meat from the lower bead on the lower groove surface of the V groove to the upper groove surface of the V groove. When forming, the welding torch is inclined at an angle αa upward with respect to the horizontal plane to perform the pass, so that insufficient penetration into the upper groove surface can be avoided.
　本開示の第２の態様において、前記Ｖ開先の前記下側開先面に盛った下側ビードに肉を盛って中間ビードを形成する場合には、前記溶接トーチを水平にしてパスを実施し、前記中間ビードから前記Ｖ開先の前記上側開先面にかけて肉を盛って前記上側ビードを形成するパスを水平面に対して前記溶接トーチを上方に角度αａ傾けて実施する構成とする。 In the second aspect of the present disclosure, when the intermediate bead is formed by filling the lower bead on the lower groove surface of the V groove, a pass is performed with the welding torch horizontal. Then, a path for forming the upper bead by filling the meat from the intermediate bead to the upper groove surface of the V groove is performed by inclining the welding torch at an angle αa with respect to a horizontal plane.
　本開示の第２の態様に係る横向き突き合わせ溶接方法では、下側ビードに肉を盛って中間ビードを形成する場合も、上下の開先面に溶け込み不足が生じること、及び、溶接部分にブローホールが残ることのいずれもが回避されることとなる。 In the horizontal butt welding method according to the second aspect of the present disclosure, even when the intermediate bead is formed by filling the lower bead, insufficient penetration occurs in the upper and lower groove surfaces, and a blow hole is formed in the welded portion. Will be avoided.
　本開示の第３の態様は、前記Ｖ開先の前記上側開先面と水平面とが成す角度θａと、前記Ｖ開先の前記下側開先面と水平面とが成す角度θｂとの合計が７０°以下である構成としている。 According to a third aspect of the present disclosure, the sum of an angle θa formed by the upper groove surface of the V groove and a horizontal plane and an angle θb formed by the lower groove surface of the V groove and a horizontal plane is as follows. The angle is set to 70 ° or less.
　本開示の第３の態様に係る横向き突き合わせ溶接方法では、Ｖ開先の上側開先面及び下側開先面がそれぞれ水平面と成す角度θａ，θｂの合計を７０°以下としているので、アルミ合金製の被溶接材に対して横向き溶接を行う場合に、ブローホール等の欠陥が生じるのをより確実に抑え得ることとなる。 In the lateral butt welding method according to the third aspect of the present disclosure, the sum of the angles θa and θb formed by the upper groove surface and the lower groove surface of the V groove with the horizontal plane is 70 ° or less, and therefore, the aluminum alloy When performing lateral welding on a workpiece to be welded, defects such as blowholes can be more reliably suppressed.
７　　溶接トーチ
Ｂｓ　裏波ビード（最初のパスによるビード）
Ｗｖ　Ｖ開先
Ｗａ　上側開先面
Ｗｂ　下側開先面
Ｗｌ　下側の立壁パネル（被溶接材）
Ｗｕ　上側の立壁パネル（被溶接材）
αａ　溶接トーチの上方傾け角度
αｂ　溶接トーチの下方傾け角度
θａ　水平面に対する上側開先面の成す角度
θｂ　水平面に対する下側開先面の成す角度 7 Welding torch Bs Uranami bead (bead by first pass)
Wv V groove Wa Upper groove surface Wb Lower groove surface Wl Lower standing wall panel (material to be welded)
Wu Upper standing wall panel (welded material)
αa Upper tilt angle of welding torch αb Lower tilt angle of welding torch θa Angle formed by upper groove face with respect to horizontal plane θb Angle formed by lower groove face with respect to horizontal plane

Claims (3)

  1. 　上下に並べて支持されたアルミ合金製の被溶接材同士を突き合わせて接合する横向き突き合わせ溶接方法において、
    　前記被溶接材間の突き合わせ部に横向きのＶ開先を形成し、
    　水平面に対する前記Ｖ開先の上側開先面の成す角度θａを水平面に対する前記Ｖ開先の下側開先面の成す角度θｂよりも大きく設定し、
    　前記Ｖ開先に沿って溶接トーチをウィービングさせつつ複数回パスさせて肉を盛る際の最初のパスは該溶接トーチを水平にして実施し、
    　以降、前記Ｖ開先の前記下側開先面に直に肉を盛るパスは前記溶接トーチを水平面に対して下方に角度αｂ傾けて実施し、
    　前記Ｖ開先の前記下側開先面に盛った下側ビードから前記Ｖ開先の前記上側開先面にかけて肉を盛って上側ビードを形成するパスは前記溶接トーチを水平面に対して上方に角度αａ傾けて実施する横向き突き合わせ溶接方法。     In a horizontal butt welding method of joining and joining aluminum alloy workpieces supported side by side up and down,
    Forming a lateral V groove at the butted portion between the workpieces,
    An angle θa formed by an upper groove surface of the V groove with respect to the horizontal plane is set to be larger than an angle θb formed by a lower groove surface of the V groove with respect to the horizontal plane,
    The first pass when filling the meat by passing the welding torch a plurality of times while weaving the welding torch along the V groove is performed with the welding torch horizontal,
    Thereafter, a pass for directly filling the lower groove surface of the V groove is performed by inclining the welding torch at an angle αb downward with respect to a horizontal plane,
    The path for forming the upper bead by filling the meat from the lower bead on the lower groove surface of the V groove to the upper groove surface of the V groove moves the welding torch upward with respect to a horizontal plane. A lateral butt welding method performed at an angle αa.
  2. 　前記Ｖ開先の前記下側開先面に盛った下側ビードに肉を盛って中間ビードを形成する場合には、前記溶接トーチを水平にしてパスを実施し、前記中間ビードから前記Ｖ開先の前記上側開先面にかけて肉を盛って前記上側ビードを形成するパスを水平面に対して前記溶接トーチを上方に角度αａ傾けて実施する請求項１に記載の横向き突き合わせ溶接方法。 When the intermediate bead is formed by filling the lower bead of the V groove on the lower groove surface, a pass is performed with the welding torch horizontal, and the V bead is opened from the intermediate bead. 2. The method according to claim 1, wherein a pass for forming the upper bead by filling the upper bevel over the upper bevel surface is performed by inclining the welding torch at an angle [alpha] a with respect to a horizontal plane.
  3. 　前記Ｖ開先の前記上側開先面と水平面とが成す角度θａと、前記Ｖ開先の前記下側開先面と水平面とが成す角度θｂとの合計が７０°以下である請求項１又は２に記載の横向き突き合わせ溶接方法。 The sum of an angle θa formed by the upper groove surface and the horizontal plane of the V groove and an angle θb formed by the lower groove surface and the horizontal surface of the V groove is 70 ° or less. 2. The horizontal butt welding method according to 2.
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