WO2021182516A1 - 溶接構造体の製造方法 - Google Patents

溶接構造体の製造方法 Download PDF

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Publication number
WO2021182516A1
WO2021182516A1 PCT/JP2021/009544 JP2021009544W WO2021182516A1 WO 2021182516 A1 WO2021182516 A1 WO 2021182516A1 JP 2021009544 W JP2021009544 W JP 2021009544W WO 2021182516 A1 WO2021182516 A1 WO 2021182516A1
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torch
auxiliary
welded structure
manufacturing
welding
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PCT/JP2021/009544
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English (en)
French (fr)
Japanese (ja)
Inventor
正和 柴原
一樹 生島
佑太 三ツ井
新太郎 前田
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公立大学法人大阪
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Priority to JP2022507247A priority Critical patent/JPWO2021182516A1/ja
Publication of WO2021182516A1 publication Critical patent/WO2021182516A1/ja

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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
    • B23K9/00—Arc welding or cutting
    • B23K9/235—Preliminary treatment

Definitions

  • the present invention relates to a method for manufacturing a welded structure.
  • Patent Document 1 Japanese Unexamined Patent Publication No. 2015-199111 describes a method for manufacturing a welded structure.
  • the welded structure described in Patent Document 1 has a first member and a second member superposed on the first member.
  • the weld metal portion to which the first member and the second member are welded extends along the welding line direction.
  • the portions sandwiching the weld metal portion in the direction intersecting the welding line direction are referred to as the first portion and the second portion.
  • the weld metal portion is formed by irradiating the welded structure while moving the first laser along the welding line direction.
  • the second laser is irradiated to the first portion.
  • the first portion is not melted by the irradiation of the second laser.
  • the irradiation position of the first laser in the welding line direction and the irradiation position of the second laser in the welding line direction coincide with each other. According to the method for manufacturing a welded structure described in Patent Document 1, it is said that the occurrence of high temperature cracks (solidification cracks) in the weld metal portion can be suppressed.
  • Patent Document 1 the method for manufacturing a welded structure described in Patent Document 1 has room for improvement with respect to the occurrence of high-temperature cracks in the weld metal portion.
  • the present invention has been made in view of the above-mentioned problems of the prior art. More specifically, the present invention provides a method for manufacturing a welded structure capable of suppressing the occurrence of high temperature cracks.
  • the weld metal portion extending along the first direction and the weld metal portion intersecting with the first direction are sandwiched.
  • This is a method for manufacturing a welded structure having a first portion and a second portion.
  • the above-mentioned method for manufacturing a welded structure includes a step of forming a weld metal portion by moving a weld torch from one side in the first direction to the other side in the first direction along a first direction, and a welding torch.
  • the first and second parts by moving at least one auxiliary torch along the first direction from one side in the first direction to the other side in the first direction during at least a portion of the movement. It is provided with a step of heating at least one of the above so as not to melt.
  • Each of the positions of the at least one auxiliary torch in the first direction deviates from the position of the welding torch in the first direction.
  • At least one auxiliary torch may include a first auxiliary torch that heats the first portion and a second auxiliary torch that heats the second portion.
  • the first auxiliary torch and the second auxiliary torch may face each other in the second direction.
  • the first auxiliary torch and the second auxiliary torch may be located on one side in the first direction with respect to the welding torch.
  • a solidified brittle temperature region in which a liquid phase and a solid phase coexist is formed adjacent to one side of the molten pool formed by the welding torch in the first direction. May be good.
  • the first auxiliary torch and the second auxiliary torch may face the solidification brittle temperature region in the second direction.
  • At least one auxiliary torch may include a third auxiliary torch that heats the first portion and a fourth auxiliary torch that heats the second portion.
  • the third auxiliary torch and the fourth auxiliary torch may be located on the other side in the first direction with respect to the welding torch.
  • the third auxiliary torch and the fourth auxiliary torch may face each other in the second direction.
  • the occurrence of high temperature cracks in the weld metal portion can be suppressed.
  • FIG. 1 is a plan view of the welded structure according to the first embodiment.
  • FIG. 2 is a cross-sectional view taken along the line II-II of FIG.
  • the welded structure according to the first embodiment includes a first member 1, a second member 2, and a weld metal portion 3.
  • the first portion 7 and the second portion 8 in the welded structure according to the first embodiment are portions that sandwich the weld metal portion 3 in the second direction DR2 described later.
  • the first member 1 and the second member 2 are, for example, flat plate-shaped members.
  • the first member 1 and the second member 2 are made of, for example, steel.
  • the first member 1 and the second member 2 are, for example, rolled steel sheets (SM material) for welded structures specified in JIS standards (JIS G 3106: 2008).
  • the first member 1 and the second member 2 are made of the same material, for example.
  • the first member 1 and the second member 2 may be made of different materials.
  • the first member 1 and the second member 2 do not have to be made of steel.
  • the first member 1 and the second member 2 may be a non-ferrous alloy such as an aluminum (Al) alloy.
  • the weld metal portion 3 extends along the first direction DR1.
  • the first direction DR1 is the welding line direction.
  • the weld metal portion 3 is composed of a weld metal in which the molten first member 1 and the second member 2 are mixed (in the case where a welding material is used, the molten welding material is further mixed) and solidified. This is the part that is.
  • the weld metal portion 3 is sandwiched between the first member 1 and the second member 2 in the second direction DR2. That is, the first member 1 constitutes the first portion 7, and the second member 2 constitutes the second portion 8.
  • the second direction DR2 is a direction intersecting the first direction DR1.
  • the second direction DR2 is preferably orthogonal to the first direction DR1.
  • a heat-affected zone 4 is formed around the weld metal portion 3.
  • the heat-affected zone 4 is indicated by a dotted line.
  • the heat-affected zone 4 is a portion that is not melted due to heat input during welding, but whose metal structure and mechanical properties are changed from the base metal due to heat input during welding.
  • the heat-affected zone 4 has a width W.
  • the width W is the width of the heat-affected zone 4 in the second direction DR2.
  • the width W is wider than the case where the auxiliary heating step S22 is not performed in the welding step S2 (only the weld metal forming step S21 is performed in the welding step S2). Therefore, by measuring the width W, it can be determined whether both the weld metal forming step S21 and the auxiliary heating step S22 are performed.
  • FIG. 3 is a process diagram showing a method for manufacturing a welded structure according to the first embodiment.
  • the method for manufacturing a welded structure according to the first embodiment includes a preparation step S1 and a welding step S2.
  • the welding step S2 is performed after the preparation step S1.
  • the welding step S2 includes a welding metal forming step S21 and an auxiliary heating step S22.
  • FIG. 4 is a schematic view for explaining the preparation step S1 in the method for manufacturing the welded structure according to the first embodiment.
  • the first member 1 and the second member 2 are prepared.
  • the first member 1 has a first end surface 1a.
  • the first end surface 1a is an end surface of the first member 1 in the second direction DR2.
  • the second member 2 has a second end surface 2a.
  • the second end surface 2a is an end surface of the second member 2 in the second direction DR2.
  • the first member 1 and the second member 2 are butted so that the first end surface 1a and the second end surface 2a face each other in the second direction DR2.
  • the first member 1 and the second member 2 are fixed by temporary attachment. This temporary attachment is performed at a plurality of points along the first direction DR1.
  • FIG. 5 is a schematic view for explaining the welding step S2 in the method for manufacturing the welded structure according to the first embodiment.
  • the welding torch 5, the first auxiliary torch 6a, and the second auxiliary torch 6b are indicated by dotted lines.
  • the weld metal portion 3 is formed in the weld metal forming step S21.
  • the weld metal portion 3 is formed by moving the weld torch 5 along the first direction DR1.
  • the welding torch 5 is moved from one side (starting end side) in the first direction DR1 to the other side (ending end side) in the first direction DR1.
  • the welding torch 5 is arranged so as to straddle the first member 1 and the second member 2.
  • the first member 1 on the first end surface 1a side and the second member 2 on the second end surface 2a side are melted and solidified, and the weld metal portion 3 is formed.
  • the welding torch 5 is, for example, a welding torch of an arc welder.
  • the welding torch 5 is not limited to this, and may be, for example, a welding torch of a laser welding machine.
  • a molten pool 51 is formed in the vicinity of the welding torch 5.
  • the molten pool 51 is composed of a molten first member 1 and a second member 2 (when a welding material is used, the molten pool 51 further contains a molten welding material).
  • a solidification brittle temperature region 52 is formed adjacent to the start end side of the molten pool 51 in the first direction DR1.
  • the solidification brittle temperature region 52 is a region in which the solid phase and the liquid phase coexist. From another point of view, the temperature of the solidified brittle temperature region 52 exceeds the solidus temperature of the base material (first member 1 and the second member 2) and is lower than the liquidus temperature of the base material. It is an area that has become.
  • auxiliary heating step S22 is performed at least partly while the welding torch 5 is moving from the start end side to the end side along the first direction DR1.
  • first auxiliary torch 6a and the second auxiliary torch 6b move from the start end side to the end side along the first direction DR1.
  • the moving speed of the first auxiliary torch 6a and the second auxiliary torch 6b in the first direction DR1 is, for example, equal to the moving speed of the welding torch 5 in the first direction DR1.
  • the first auxiliary torch 6a heats the first member 1.
  • the second auxiliary torch 6b heats the second member 2. From another point of view, the position of the first auxiliary torch 6a in the second direction DR2 and the position of the second auxiliary torch 6b in the second direction DR2 deviate from the position of the welding torch 5 in the second direction DR2. There is.
  • the distance between the first auxiliary torch 6a and the welding torch 5 in the second direction DR2 is, for example, equal to the distance between the second auxiliary torch 6b and the welding torch 5 in the second direction DR2.
  • the output of the first auxiliary torch 6a and the second auxiliary torch 6b is smaller than the output of the welding torch 5. As a result, the first member 1 is not melted by heating the first auxiliary torch 6a, and the second member 2 is not melted by heating the second auxiliary torch 6b.
  • the position of the first auxiliary torch 6a in the first direction DR1 and the position of the second auxiliary torch 6b in the first direction DR1 are deviated from the positions of the welding torch 5 in the first direction DR1. More specifically, the first auxiliary torch 6a and the second auxiliary torch 6b are on the starting end side of the welding torch 5 in the first direction DR1.
  • the position of the first auxiliary torch 6a in the first direction DR1 and the position of the second auxiliary torch 6b in the first direction DR1 coincide with each other, for example. That is, the first auxiliary torch 6a and the second auxiliary torch 6b face each other in, for example, the second direction DR2.
  • the first auxiliary torch 6a and the second auxiliary torch 6b preferably face the solidification brittle temperature region 52 in the second direction DR2.
  • the first auxiliary torch 6a and the second auxiliary torch 6b are, for example, welding torches of an arc welder.
  • the first auxiliary torch 6a and the second auxiliary torch 6b are not limited to this, and may be, for example, a welding torch of a laser welding machine.
  • FIG. 6 is a schematic high temperature ductility curve of the solidification brittle temperature region 52 between the liquid phase temperature and the solid phase temperature.
  • the horizontal axis represents the temperature in the solidification brittleness temperature region 52
  • the vertical axis represents the strain applied to the solidification brittleness temperature region 52.
  • the high-temperature ductility curve (solid line) in FIG. 6 shows the limit strain at which high-temperature cracking occurs at a predetermined temperature.
  • T L and T S in FIG. 6 respectively show a liquidus temperature and a solidus temperature.
  • auxiliary heating is performed by the first auxiliary torch 6a and the second auxiliary torch 6b. Since the portion of the first member 1 heated by the first auxiliary torch 6a and the portion of the second member 2 heated by the second auxiliary torch 6b thermally expand, these portions are compressed into the solidification brittle temperature region 52. Stress is applied.
  • the position of the first auxiliary torch 6a in the second direction DR2 (the position of the second auxiliary torch 6b in the second direction DR2) is deviated from the position of the welding torch 5 in the second direction DR2 has been described.
  • the position of the first auxiliary torch 6a (second auxiliary torch 6b) in the second direction DR2 may coincide with the position of the welding torch 5 in the second direction DR2 (deformation example 2). ..
  • high temperature cracking is less likely to occur in the solidified brittle temperature region 52, as in the method for manufacturing the welded structure according to the first embodiment.
  • the structure of the welded structure according to the second embodiment is the same as the structure of the welded structure according to the first embodiment. Therefore, here, the description regarding the configuration of the welded structure according to the second embodiment will be omitted.
  • the method for manufacturing a welded structure according to the second embodiment includes a preparation step S1 and a welding step S2.
  • the welding step S2 includes a welding metal forming step S21 and an auxiliary heating step S22. Regarding these points, the method for manufacturing the welded structure according to the second embodiment is common to the method for manufacturing the welded structure according to the first embodiment.
  • the method for manufacturing the welded structure according to the second embodiment is different from the method for manufacturing the welded structure according to the first embodiment with respect to the details of the auxiliary heating step S22.
  • FIG. 7 is a schematic view for explaining the welding process S2 in the method for manufacturing the welded structure according to the second embodiment.
  • the welding torch 5, the third auxiliary torch 6c, and the fourth auxiliary torch 6d are indicated by dotted lines.
  • the third auxiliary torch 6c and the fourth auxiliary torch 6c and the fourth are replaced with the first auxiliary torch 6a and the second auxiliary torch 6b.
  • An auxiliary torch 6d is used.
  • the third auxiliary torch 6c and the fourth auxiliary torch 6d are moving from the start side to the end side along the first direction DR1.
  • the moving speed of the third auxiliary torch 6c and the fourth auxiliary torch 6d in the first direction DR1 is, for example, equal to the moving speed of the welding torch 5 in the first direction DR1.
  • the third auxiliary torch 6c heats the first member 1.
  • the fourth auxiliary torch 6d heats the second member 2. From another point of view, the position of the third auxiliary torch 6c in the second direction DR2 and the position of the fourth auxiliary torch 6d in the second direction DR2 deviate from the position of the welding torch 5 in the second direction DR2. There is.
  • the distance between the third auxiliary torch 6c and the welding torch 5 in the second direction DR2 is, for example, equal to the distance between the fourth auxiliary torch 6d and the welding torch 5 in the second direction DR2.
  • the output of the 3rd auxiliary torch 6c and the 4th auxiliary torch 6d is smaller than the output of the welding torch 5. As a result, the first member 1 is not melted by heating the third auxiliary torch 6c, and the second member 2 is not melted by heating the fourth auxiliary torch 6d.
  • the position of the third auxiliary torch 6c in the first direction DR1 and the position of the fourth auxiliary torch 6d in the first direction DR1 are deviated from the positions of the welding torch 5 in the first direction DR1. More specifically, the third auxiliary torch 6c and the fourth auxiliary torch 6d are on the terminal side of the welding torch 5 in the first direction DR1.
  • the position of the third auxiliary torch 6c in the first direction DR1 and the position of the fourth auxiliary torch 6d in the first direction DR1 coincide with each other, for example. That is, the third auxiliary torch 6c and the fourth auxiliary torch 6d face each other in, for example, the second direction DR2.
  • the first auxiliary torch 6a and the second auxiliary torch 6b are, for example, welding torches of an arc welder.
  • the first auxiliary torch 6a and the second auxiliary torch 6b are not limited to this, and may be, for example, a welding torch of a laser welding machine.
  • FIG. 8 is a schematic view showing in-plane rotational deformation of the first member 1 and the second member 2 that occur during the weld metal forming step S21.
  • the temperatures of the first member 1 and the second member rise significantly in the vicinity of the welding torch 5, while being separated from the welding torch 5. At the position, the temperatures of the first member 1 and the second member do not rise so much.
  • the third auxiliary torch 6c and the fourth auxiliary torch 6d heat the first member 1 and the second member 2 on the terminal side of the welding torch 5, respectively. Therefore, the difference in the amount of thermal expansion between the vicinity of the welding torch 5 and the position away from the welding torch 5 is reduced. As a result, the amount of in-plane deformation of the first member 1 and the second member 2 is reduced, and the tensile strain applied to the solidification brittle temperature region 52 is reduced. As described above, according to the method for manufacturing the welded structure according to the second embodiment, high temperature cracking is less likely to occur in the solidified brittle temperature region 52.
  • the third auxiliary torch 6c and the fourth auxiliary torch 6d heat the first member 1 and the second member 2 on the terminal side of the welding torch 5, respectively. Therefore, the temporary fixing on the terminal side of the welding torch 5 is preheated. That is, in the method for manufacturing a welded structure according to the second embodiment, the restraint against in-plane rotational deformation due to temporary fixing is weakened in advance.
  • the occurrence of high temperature cracking in the solidification brittle temperature region 52 can be further suppressed. ..
  • auxiliary heating step S22 is performed using the third auxiliary torch 6c and the fourth auxiliary torch 6d
  • either one of the third auxiliary torch 6c and the fourth auxiliary torch 6d may be used (modification example 2).
  • the third auxiliary torch 6c or the fourth auxiliary torch 6d is used, depending on the arrangement of the weld metal portion 3 (for example, when the weld metal portion 3 is near the end of the welded structure), It may not be possible to sufficiently suppress high temperature cracking.
  • both the third auxiliary torch 6c and the fourth auxiliary torch 6d are used, it is possible to stably suppress the occurrence of high temperature cracks regardless of the arrangement of the weld metal portion 3.
  • FIG. 9 is a plan view of the welded structure according to the third embodiment.
  • FIG. 10 is a cross-sectional view taken along the line XX of FIG.
  • the welded structure according to the third embodiment includes a first member 1, a second member 2, and a weld metal portion 3.
  • the structure of the welded structure according to the third embodiment is common to the structure of the welded structure according to the first embodiment.
  • the second member 2 is superposed on the first member 1.
  • the weld metal portion 3 is formed so as to penetrate the first member 1 and the second member 2. That is, in the welded structure according to the third embodiment, the portions of the first member 1 and the second member 2 adjacent to the weld metal portion 3 from one side in the second direction DR2 become the first portion 7. The portion of the first member 1 and the second member 2 adjacent to the weld metal portion 3 from the other side in the second direction DR2 is the second portion 8.
  • the structure of the welded structure according to the third embodiment is different from the structure of the welded structure according to the first embodiment.
  • the width of the first portion 7 in the second direction DR2 and the width of the second portion 8 in the second direction DR2 may be different from each other.
  • the method for manufacturing a welded structure according to the third embodiment includes a preparation step S1 and a welding step S2.
  • the welding step S2 includes a welding metal forming step S21 and an auxiliary heating step S22. Regarding these points, the method for manufacturing the welded structure according to the third embodiment is common to the method for manufacturing the welded structure according to the first embodiment.
  • the method for manufacturing the welded structure according to the third embodiment is the method for manufacturing the welded structure according to the first embodiment with respect to the details of the preparation step S1, the details of the weld metal forming step S21, and the details of the auxiliary heating step S22. Is different.
  • FIG. 11 is a schematic diagram for explaining the preparation step S1 in the method for manufacturing the welded structure according to the third embodiment.
  • the second member 2 is superposed on the first member 1.
  • FIG. 12 is a schematic view for explaining the welding step S2 in the method for manufacturing the welded structure according to the third embodiment.
  • the welding torch 5, the first auxiliary torch 6a and the second auxiliary torch 6b are indicated by dotted lines.
  • the weld torch 5 is moved from the start end side to the end side along the first direction DR1.
  • the weld metal portion 3 is formed so as to penetrate the first member 1 and the second member 2.
  • the first portion 7 (the first member 1 and the second member 2 adjacent to the weld metal portion 3 from one side in the second direction DR2) Part) is heated by the first auxiliary torch 6a
  • the second part 8 (the part of the first member 1 and the second member 2 adjacent to the weld metal part 3 from the other side in the second direction DR2) is the second. It is heated by the auxiliary torch 6b.
  • the first portion 7 is not melted by heating the first auxiliary torch 6a
  • the second portion 8 is not melted by heating the second auxiliary torch 6b.
  • the tensile strain applied to the solidification brittleness temperature region 52 is reduced (or solidification brittleness) by heating the first auxiliary torch 6a and the second auxiliary torch 6b. Since compressive strain is applied to the temperature region 52), high temperature cracking is less likely to occur in the solidified brittle temperature region 52.
  • FIG. 13 is a cross-sectional view of the welded structure according to the fourth embodiment.
  • FIG. 13 shows a cross-sectional view orthogonal to the extending direction (first direction DR1) of the weld metal portion 3.
  • the first member 1 has a thickness T1 and the second member 2 has a thickness T2.
  • the thickness T1 and the thickness T2 are 16 mm or more and 40 mm or more. That is, the welded structure according to the fourth embodiment is common to the welded structure according to the first embodiment in that it is a butt welded joint, but a thick plate is used as the first member 1 and the second member 2. It is different from the welded structure according to the first embodiment in that it is.
  • the method for manufacturing a welded structure according to the fourth embodiment includes a preparation step S1 and a welding step S2.
  • the welding step S2 includes a welding metal forming step S21 and an auxiliary heating step S22.
  • the method for manufacturing the welded structure according to the fourth embodiment is different from the method for manufacturing the welded structure according to the first embodiment.
  • the method for manufacturing the welded structure according to the fourth embodiment is different from the method for manufacturing the welded structure according to the first embodiment with respect to the details of the preparation step S1 and the welding step S2.
  • FIG. 14 is a cross-sectional view for explaining the preparation step S1 in the method for manufacturing the welded structure according to the fourth embodiment.
  • the end surface (second end surface 2a) on the first member 1 side constitutes a Y-shaped groove.
  • the groove composed of the first end surface 1a and the second end surface 2a is not limited to the Y groove.
  • the groove composed of the first end surface 1a and the second end surface 2a may be a V-shaped groove, an X-shaped groove, a K-shaped groove, or the like.
  • the welding step S2 (welded metal forming step S21 and auxiliary heating step S22) in the method for manufacturing a welded structure according to the fourth embodiment may be repeated a plurality of times. That is, the weld metal portion 3 of the welded structure according to the fourth embodiment may be formed by multi-layer welding.
  • the welding step S2 in the welding structure manufacturing method according to the fourth embodiment replaces the welding step S2 in the welding structure manufacturing method according to the first embodiment with the welding structure according to the second embodiment. Welding step S2 in the manufacturing method may be used.
  • FIG. 15 is a perspective view of the welded structure according to the fifth embodiment.
  • FIG. 15 shows a cross-sectional view of the weld metal portion 3 orthogonal to the extending direction.
  • FIG. 16 is a cross-sectional view of the welded structure according to the fifth embodiment.
  • the welded structure according to the fifth embodiment includes a first member 1, a second member 2, and a weld metal portion 3.
  • the first member 1 has a first end surface 1a and a first main surface 1b.
  • the second member 2 has a second end surface 2a and a second main surface 2b.
  • the second member 2 is arranged on the first member 1 (on the first main surface 1b) so that the second end surface 2a faces the first main surface 1b.
  • the weld metal portion 3 extends along the first direction DR1 and joins the first main surface 1b side of the first member 1 and the second end surface 2a side of the second member 2. That is, the welded structure according to the first embodiment is a butt joint, while the welded structure according to the fifth embodiment is a T joint.
  • the method for manufacturing a welded structure according to the fifth embodiment includes a preparation step S1 and a welding step S2.
  • the welding step S2 includes a welding metal forming step S21 and an auxiliary heating step S22.
  • the method for manufacturing the welded structure according to the fifth embodiment is different from the method for manufacturing the welded structure according to the first embodiment.
  • the method for manufacturing the welded structure according to the fifth embodiment is different from the method for manufacturing the welded structure according to the first embodiment with respect to the details of the preparation step S1 and the welding step S2.
  • the second member 2 is placed on the first member 1 (first main surface 1b) so that the second end surface 2a faces the first main surface 1b. Placed on).
  • FIG. 17 is a schematic view for explaining the welding step S2 in the method for manufacturing the welded structure according to the fifth embodiment.
  • the weld torch 5 is moved from one side of the first direction DR1 to the other side of the first direction DR1.
  • the first main surface 1b side of the first member 1 and the second end surface 2a side of the second member 2 are melted to form the weld metal portion 3.
  • the first auxiliary torch 6a and the second auxiliary torch 6b move from one side of the first direction DR1 toward the other side of the first direction DR1. , Moved with the welding torch 5. At this time, the first auxiliary torch 6a is heated so as not to melt the first main surface 1b, and the second auxiliary torch 6b is heated so as not to melt the second main surface 2b.
  • the first auxiliary torch 6a and the second auxiliary torch 6b are on one side of the welding torch 5 in the first direction DR1.
  • the positions of the first auxiliary torch 6a and the second auxiliary torch 6b in the first direction DR1 overlap with the positions of the solidification brittle temperature region 52 formed by the welding torch 5 in the first direction DR1.
  • a third auxiliary torch 6c and a fourth auxiliary torch 6d are used in place of the first auxiliary torch 6a and the second auxiliary torch 6b.
  • the third auxiliary torch 6c and the fourth auxiliary torch 6d may be used together with the first auxiliary torch 6a and the second auxiliary torch 6b.
  • the third auxiliary torch 6c and the fourth auxiliary torch 6d are the first main surface 1b and the first main surface 1b on the other side in the first direction DR1 from the welding torch 5, respectively.
  • the second main surface 2b is heated so as not to melt.

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PCT/JP2021/009544 2020-03-12 2021-03-10 溶接構造体の製造方法 WO2021182516A1 (ja)

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Cited By (1)

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EP4434666A1 (en) * 2023-03-23 2024-09-25 Linde GmbH Apparatus and method of heating an area of a workpiece prior to welding said area of the workpiece and/or after welding the workpiece, and welding system comprising such an apparatus

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JPH09192839A (ja) * 1996-01-19 1997-07-29 Mitsubishi Heavy Ind Ltd 自動溶接方法及び装置
WO2015198405A1 (ja) * 2014-06-25 2015-12-30 株式会社日立製作所 溶接部構造

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JPH09192839A (ja) * 1996-01-19 1997-07-29 Mitsubishi Heavy Ind Ltd 自動溶接方法及び装置
WO2015198405A1 (ja) * 2014-06-25 2015-12-30 株式会社日立製作所 溶接部構造

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4434666A1 (en) * 2023-03-23 2024-09-25 Linde GmbH Apparatus and method of heating an area of a workpiece prior to welding said area of the workpiece and/or after welding the workpiece, and welding system comprising such an apparatus
WO2024193854A1 (en) * 2023-03-23 2024-09-26 Linde Gmbh Apparatus and method of heating an area of a workpiece prior to welding said area of the workpiece and/or after welding the workpiece, and welding system comprising such an apparatus

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