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采用波长为1070nm的光纤激光,对厚度均为0.2mm的304不锈钢和T2紫铜超薄板进行了激光搭接焊。采用钢-铜-钢三层搭接方法时,能得到良好的焊缝和较宽的工艺窗口。焊缝显微结构呈现出与焊缝边缘平行的黑色层状花纹。能谱分析结果表明,焊缝下部的铜含量高于上部的。显微硬度测试结果表明,接头硬度最低区域为铜层热影响区,单侧热影响区的宽度在1mm左右。拉伸试验结果显示,断裂位置处于铜层热影响区,其最大拉伸强度为213 MPa。
Laser lap welding was performed on a 304 stainless steel and a T2 ultra-thin copper plate of 0.2 mm in thickness using a fiber laser at a wavelength of 1070 nm. Using steel - copper - steel lap method, can get a good weld and a wider process window. The microstructure of the weld presents a black layered pattern parallel to the edge of the weld. The results of energy spectrum analysis show that the copper content in the lower part of the weld is higher than that in the upper part. The results of microhardness test show that the lowest hardness of joint is the heat affected zone of copper layer and the width of unilateral heat affected zone is about 1mm. Tensile test results show that the fracture location is in the heat affected zone of copper layer and the maximum tensile strength is 213 MPa.