Effect of Tensile Direction on HAZ Softening Fracture of Laser Welded Martensite Steel Sheet
自動車用鋼板のレーザー溶接HAZ軟化部破断におよぼす引張方向の影響
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- Publication code
- 20244094
- Paper/Info type
- JSAE Transaction
Vol.55 No.2
- Pages
- 393-398(Total 6 p)
- Date of publication
- Mar 2024
- Publisher
- JSAE
- Language
- Japanese
Detailed Information
| Category(J) | 論文 Translation |
|---|---|
| Category(E) | Paper |
| Author(J) | 1) 天野 由紀子, 2) 吉田 一也, 3) 窪田 紘明 |
| Author(E) | 1) Yukiko Amano, 2) Kazunari Yoshida, 3) Hiroaki Kubota |
| Affiliation(J) | 1) 東海大学, 2) 東海大学, 3) 東海大学 |
| Abstract(J) | 高強度自動車用鋼板のレーザー溶接部ではHAZ軟化部で破断することがある．本研究では1500MPa級鋼板を用いて，レーザー溶接線に対して任意の方向に引張りを加えて強度を評価した．その結果，溶接線角度を20°とすることで継手強度と伸びが大幅に向上することを明らかにした．さらに，FEMを用いてそのメカニズムを考察した． Translation |
| Abstract(E) | In recent years, demand for high-tensile strength steel sheets has been increasing from the viewpoints of energy conservation through weight reduction and the upgrading of product functions. However, since such high tensile strength steel sheets contain martensite, it has been reported that material strength is greatly reduced in the Heat Affected Zone (HAZ) due to tempering during laser welding. In other words, when laser welding is applied to high-strength materials, there is a possibility that rupture will be apparent in the HAZ softened zone. In this study, we evaluate the strength of a 1500 MPa steel sheet, which is subject to HAZ softening, by applying tension in any direction to the laser weld line and rupturing it. The results show that a welding angle of 20 ° significantly improves elongation and strength. If it is possible to minimize the strength loss due to HAZ softening by using these results, the welding portion of high-strength materials can be located where tensile deformation occurs during forming or collision, thereby increasing design flexibility. |
