WO2015198405A1 - Structure de partie de soudure - Google Patents

Structure de partie de soudure Download PDF

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Publication number
WO2015198405A1
WO2015198405A1 PCT/JP2014/066757 JP2014066757W WO2015198405A1 WO 2015198405 A1 WO2015198405 A1 WO 2015198405A1 JP 2014066757 W JP2014066757 W JP 2014066757W WO 2015198405 A1 WO2015198405 A1 WO 2015198405A1
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WO
WIPO (PCT)
Prior art keywords
weld
welding
weld metal
solidification
heat affected
Prior art date
Application number
PCT/JP2014/066757
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English (en)
Japanese (ja)
Inventor
真 緒方
Original Assignee
株式会社日立製作所
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社日立製作所 filed Critical 株式会社日立製作所
Priority to PCT/JP2014/066757 priority Critical patent/WO2015198405A1/fr
Publication of WO2015198405A1 publication Critical patent/WO2015198405A1/fr

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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
    • 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
    • B23K9/095—Monitoring or automatic control of welding parameters

Definitions

  • the present invention relates to a welded part structure that reduces weld solidification cracking.
  • welding is included in the manufacturing process of nuclear power plants, chemical plants, railway vehicles, and the like.
  • Casting steel, stainless steel, aluminum alloy, and nickel-base alloy are used in nuclear power plants, chemical plants, and railway vehicles.
  • an arc or laser is used as a heat source to melt and solidify the material.
  • the fusion welding method to be joined is used.
  • the high-strength material indicates a material having a martensite phase having a tensile strength of 600 MPa or more.
  • An object of the present invention is to reduce solidification cracking during martensitic steel welding.
  • FIG. 1 shows a welded part structure in which a weld metal part 2 is formed by heating and melting a base material 1 from above the base material 1 using a welding torch 7 for the base material 1 made of martensitic steel. It is sectional drawing at the time of seeing from the advancing direction.
  • FIG. 1 shows a one-layer, one-pass, one-side welding structure. Multi-layer and multi-pass and double-side welded structures may be used.
  • a weld heat affected zone 3 exists between the weld metal portion 2 and the base material 6, and 5 is a surface heat affected zone width. Boundaries can be visually confirmed between the weld metal portion 2 and the weld heat affected zone 3 and between the weld heat affected zone 3 and the base material 1.
  • the welding heat-affected zone 3 is a portion where the base material is not melted but structurally altered due to the influence of heat from welding.
  • the compressive strain 12 is mechanically transferred from the outside of the billet to the final solidified portion 10 by the amount of the tensile strain 11 generated along with the solidification shrinkage.
  • the light reduction technique that is applied is used.
  • This light reduction technology is suitable for structures that are easy to apply stress from the outside, such as a rectangular parallelepiped, such as a continuous cast billet. If not, compression strain corresponding to the tensile strain generated along with solidification shrinkage cannot be applied appropriately.
  • FIG. 5 shows the strain generated in the weld metal part 2 and the base material 1 around the expansion of the weld heat affected part 3.
  • the volume expansion 13 caused by the martensitic transformation in the weld heat affected zone 3 generates a strain 14 that compresses the final solidified portion 16 in the weld metal 2 and pushes the base material 1 in the direction opposite to the weld heat affected zone 3 15. Is generated.
  • a strain 14 that compresses the final solidified portion 16 in the weld metal 2 is applied when the final solidified portion 16 reaches a temperature range where solidification cracks occur.
  • produces in the last solidification part 16 at the time of martensitic steel welding can be reduced.
  • the solidification rate in the vicinity of the final solidification zone 16 is in the solidification brittle temperature region of 0.8-0.99, When the strain is 0.2%, solidification cracking is likely to occur.
  • the weld heat affected zone 3 is between the martensite start temperature and the end temperature while the final solidified portion 16 at the center of the weld metal portion 2 is in the solidification brittle temperature range of 0.8 to 0.99. Is the first condition to achieve the objective.
  • the surface heat-affected zone width 5 is a ratio of a certain ratio to the surface melt width 6. Must have.
  • the surface heat affected zone width 5 is W H and the surface melt width 6 is W W , it is necessary that 0.25 ⁇ W H / W W ⁇ 0.75.
  • the surface melt width 6 and the melt depth 4 have a constant ratio.
  • the melt depth 4 is D W , 0.4 ⁇ W W / D W ⁇ 0.6. desirable.
  • the compressive strain 14 for compressing the final solidified portion 16 when the final solidified portion 16 reaches a temperature range where solidified cracks are generated it is possible to reduce the solidified cracks generated in the final solidified portion 16. .
  • the final solidified portion 16 has a gap amount 18 between the ends of the dendrites extending from the outside of the weld metal portion 2 toward the central portion as shown in FIG.
  • collisions and integration may occur. It is characterized by having a microstructure like the equiaxed crystal 19 when dendrites collide and are cut.
  • a welding process plan as shown in FIG. 8 can be considered.
  • the preheating torch 20 precedes the welding torch 7 to heat the base material to produce the pretropical zone 21, thereby reproducing an arbitrary temperature gradient during the main welding of the welding torch 7 and reducing solidification cracks.
  • a structure can be obtained.
  • the temperature state in the vicinity of the weld is monitored in real time, and the output of the electric heating is controlled.
  • a mechanism that can be controlled to a certain degree it is possible to obtain a welded part structure that reproduces an arbitrary temperature gradient during the main welding of the welding torch 7 and reduces solidification cracking.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Arc Welding In General (AREA)

Abstract

Afin de réduire la fissuration due à la solidification lors du soudage de l'acier martensitique, l'invention concerne une structure de partie de soudure dans laquelle un matériau parent contient du fer, et a une partie métallique soudée et une zone affectée par la chaleur de soudage sur l'extérieur de la partie métallique soudée. Quand la largeur de la surface de la partie métallique soudée est WW et la largeur de la surface de la zone affectée par la chaleur de soudage est WH, la relation 0,25 < WH/WW < 0,75 est satisfaite.
PCT/JP2014/066757 2014-06-25 2014-06-25 Structure de partie de soudure WO2015198405A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2014/066757 WO2015198405A1 (fr) 2014-06-25 2014-06-25 Structure de partie de soudure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2014/066757 WO2015198405A1 (fr) 2014-06-25 2014-06-25 Structure de partie de soudure

Publications (1)

Publication Number Publication Date
WO2015198405A1 true WO2015198405A1 (fr) 2015-12-30

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Family Applications (1)

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PCT/JP2014/066757 WO2015198405A1 (fr) 2014-06-25 2014-06-25 Structure de partie de soudure

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WO (1) WO2015198405A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021182516A1 (fr) * 2020-03-12 2021-09-16 公立大学法人大阪 Procédé de fabrication de structure soudée

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6233072A (ja) * 1985-07-31 1987-02-13 Sumitomo Metal Ind Ltd サブマ−ジ・ア−ク溶接方法
JP2006183127A (ja) * 2004-12-28 2006-07-13 Jfe Steel Kk 高強度溶接鋼管の製造方法
US20080203139A1 (en) * 2001-06-29 2008-08-28 Mccrink Edward J Method for controlling weld metal microstructure using localized controlled cooling of seam-welded joints
JP2013099793A (ja) * 2011-01-26 2013-05-23 Denso Corp 溶接方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6233072A (ja) * 1985-07-31 1987-02-13 Sumitomo Metal Ind Ltd サブマ−ジ・ア−ク溶接方法
US20080203139A1 (en) * 2001-06-29 2008-08-28 Mccrink Edward J Method for controlling weld metal microstructure using localized controlled cooling of seam-welded joints
JP2006183127A (ja) * 2004-12-28 2006-07-13 Jfe Steel Kk 高強度溶接鋼管の製造方法
JP2013099793A (ja) * 2011-01-26 2013-05-23 Denso Corp 溶接方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021182516A1 (fr) * 2020-03-12 2021-09-16 公立大学法人大阪 Procédé de fabrication de structure soudée

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