Effect of Jig Position and Release time on Welding Deformation and Residual Stress in Arc Welded Lap Joints of High Strength Steel Sheet
高張力薄鋼板重ね継手の溶接変形と残留応力に及ぼす治具拘束位置と解放タイミングの影響
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- Publication code
- 20264133
- Paper/Info type
- JSAE Transaction
Vol.57 No.2
- Pages
- 202-207(Total 6 p)
- Date of publication
- Mar 2026
- Publisher
- JSAE
- Language
- Japanese
Detailed Information
| Category(J) | 論文 Translation |
|---|---|
| Category(E) | Paper |
| Author(J) | 1) 大西 洋一郎, 2) 佐藤 健太郎, 3) 楢崎 邦男, 4) 麻 寧緒 |
| Author(E) | 1) Yoichiro Ohnishi, 2) Kentaro Sato, 3) Kunio Narasaki, 4) Ninshu Ma |
| Affiliation(J) | 1) JFEスチール株式会社，大阪大学, 2) JFEスチール株式会社, 3) 大阪大学, 4) 大阪大学 |
| Abstract(J) | 高張力薄鋼板のアーク溶接重ね継手の溶接変形に及ぼす治具拘束位置と解放タイミングの影響について溶接過程の昇温および降温時の材料特性を用いた数値解析より調査した．溶接変形の抑制には，鋼板が室温まで冷却されたタイミングでの治具解放，そして溶接幅方向ひずみが0になる箇所の治具拘束が有効であることを確認した。 Translation |
| Abstract(E) | It is well known that jig constraint during welding significantly affects welding deformation and residual stress. However, research on the deformation mechanism and welding deformation control in arc welded lap joints of high strength steel sheet remains insufficient. In this study, to precisely analyze residual stress and strain, material properties during both the heating and cooling of 780MPa high strength steel sheet were measured. Using these material properties, the residual stress and welding deformation in the arc welded lap joints were analyzed using the thermal elastic-plastic finite element method (FEM). The maximum temperature distribution on the heat affected zone (HAZ) was measured and well predicted by welding thermal conduction analysis. The release time of jig constraint and its constraint positions were changed in numerical experiments for investigation of their influence. When steel sheets cooled down to room temperature and the jig constraint is released, welding deformation can be significantly suppressed. When the jig constraint is located around the position where the Y-direction strain becomes to zero changing from weld metal, the bending deformation can be well controlled. When the jig is located within the plastic deformation zone, the welded lap joint bends toward the opposite side of the welded surface. When it is located far from the welded zone, the lap joint bends toward the welded surface side. |
