60 mm厚304不锈钢板超窄间隙光纤激光焊接接头组织性能研究

张国伟; 肖荣诗

doi:doi:10.3788/cjl201441.0803007

中国激光, 2014, 41 (8): 0803007, 网络出版: 2014-07-08

60 mm厚304不锈钢板超窄间隙光纤激光焊接接头组织性能研究下载： 543次

Microstructure and Mechanical Property of 60 mm-Thick 304 Stainless Steel Joint by Ultra-Narrow Gap Fiber Laser Beam Welding

论文大纲

张国伟 ^*肖荣诗

作者单位

北京工业大学激光工程研究院, 北京 100124

摘要

利用IPG公司YLS-6000光纤激光器及5 mm超窄间隙焊接了60 mm厚304不锈钢板，并利用光学显微镜、扫描电镜、能谱仪和低温拉伸试验机分析了接头组织性能。结果表明，超窄间隙激光焊接方法可得到成形良好无明显缺陷的焊接接头，焊缝上下宽度一致约3.8 mm。焊缝组织为柱状奥氏体与均匀分布的骨架状和板条状铁素体。热影响区并无明显晶粒长大，少量铁素体沿熔合线向母材方向扩散生长。Cr、Ni等合金元素在焊缝及热影响区分布均匀，无明显偏析。焊缝与母材显微硬度相当，略低于热影响区。接头拉伸强度随温度降低而上升，最高达1260 MPa，在183 K、213 K、243 K、273 K温度下接头拉伸强度分别为母材的86%、96.7%、94.5%和92.6%。试样弯曲180°无裂纹及其他缺陷产生。

Abstract

304 stainless steel plates of 60 mm thick are welded using IPG YLS-6000 fiber laser and 5 mm wide groove. The microstructure and mechanical property of joint are tested by optical microscope, scanning electron microscope, energy disperse spectroscopy and tensile testing machine at low temperature. The result shows that complete defect free butt joints are obtained with ultra-narrow gap laser welding. The width of weld is uniform and is about 3.8 mm. Microstructure of joint are consist of columnar austenitic, the skeletal and the lath ferrite. There is a little ferrite diffuses and grows to the direction of the base metal and no obvious coarse grain in heat affected zone (HAZ). Main alloy elements such as Cr, Ni are even distributed in the weld and HAZ. The microhardness of the HAZ is slightly higher than that of weld metal and base metal. The tensile strength at temperature of 183 K, 213 K, 243 K and 273 K temperature are 86%, 96.7%, 94.5% and 92.6% of base metal, respectively, which increases when temperature decreases and the maximum is up to 1260 MPa. Samples are bended by 180° without any cracks or other defects.

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张国伟, 肖荣诗. 60 mm厚304不锈钢板超窄间隙光纤激光焊接接头组织性能研究[J]. 中国激光, 2014, 41(8): 0803007. Zhang Guowei, Xiao Rongshi. Microstructure and Mechanical Property of 60 mm-Thick 304 Stainless Steel Joint by Ultra-Narrow Gap Fiber Laser Beam Welding[J]. Chinese Journal of Lasers, 2014, 41(8): 0803007.

60 mm厚304不锈钢板超窄间隙光纤激光焊接接头组织性能研究下载： 543次

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