激光与光电子学进展, 2017, 54 (1): 011404, 网络出版: 2017-01-17  

保护气体对薄板A304光纤激光焊接接头形貌和力学性能的影响

Effect of Shielding Gas on Joint Morphology and Mechanical Property of Fiber Laser Welding of A304 Thin Sheet
作者单位
1 中国矿业大学材料科学与工程学院, 江苏 徐州 221008
2 常州信息职业技术学院, 江苏 常州 213164
摘要
在不同气压的高纯N2、Ar及N2/Ar混合气体保护条件下, 采用光纤激光器对厚度为2 mm的奥氏体304薄板进行了焊接试验, 研究了保护气体压强、气体类型和混合比例对焊接接头形貌及力学性能的影响。结果表明, 保护气体压强越大, 焊缝熔深就越大, 但气体压强对焊缝强度和硬度无明显影响。使用N2/Ar混合气体作为保护气体时, N2在保护气体中所占比例越大, 焊缝的熔深就越大, 而且使用不同比例的保护气体得到的焊缝均呈“丁”字形; 保护气体类型及比例对焊缝强度和硬度没有显著影响, 但焊缝的强度和硬度均大于母材。
Abstract
Under different protection conditions of shielding gases composed of pure N2, pure Ar, or N2 /Ar mixing, one experiment of fiber laser welding of 304 austenitic thin plate with a thickness of 2 mm is conducted, and the effects of shielding gas pressure, gas type, and mixing ratio on the weld joint morphology and mechanical property are investigated. The results indicate that the larger the shielding gas pressure is, the larger the weld penetration depth becomes, but the gas pressure has no obvious influence on the weld strength and hardness. When the N2/Ar mixing gas is used as the shielding gas, the larger the N2 content ratio is, the larger the penetration depth becomes, and the tee-heeded weld is kept no matter what the content ratio of shielding gas is. The type and content ratio of shielding gas have no obvious influence on the weld strength and hardness, but the strength and hardness are both larger than those of substrate.

樊宇, 李沛智, 柳岸敏, 陈正, 郭跃. 保护气体对薄板A304光纤激光焊接接头形貌和力学性能的影响[J]. 激光与光电子学进展, 2017, 54(1): 011404. Fan Yu, Li Peizhi, Liu Anmin, Chen Zheng, Guo Yue. Effect of Shielding Gas on Joint Morphology and Mechanical Property of Fiber Laser Welding of A304 Thin Sheet[J]. Laser & Optoelectronics Progress, 2017, 54(1): 011404.

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