采用V和Cu复合过渡段的TA2和304SS的激光焊接

Laser Welding of TA2 and 304SS with V and Cu Composite Transition Sections

采用2~5 mm厚的纯V与纯Cu组成复合过渡段,进行了TA2与304不锈钢的激光焊接试验,测试了接头的拉伸强度,利用金相显微镜、扫描电镜以及能谱仪对连接界面处元素扩散、接头断口形貌进行了分析。结果表明,采用加入2~5 mm V/Cu复合过渡段进行TA2和304不锈钢的激光焊接时,可以获得连接良好、无裂纹的焊接接头。中间过渡段越厚,接头抗拉强度越大,加入5 mm V/Cu复合过渡段时,接头平均抗拉强度最高达297 MPa,断裂发生在Cu过渡段内,属韧性断裂。

The laser welding experiment of TA2 and 304 stainless steel was carried out by using pure V and pure Cu composite transition sections with thickness of 2-5 mm. The tensile strength of the joint was tested and the element diffusion at the interfaces and the fracture morphologies of the joints were analyzed by metallographic microscope, scanning electron microscope and energy dispersive spectrometer. The results show that the welded joint of TA2 and 304 stainless steel can be obtained with good joining and no crack by adding 2-5 mm V/Cu composite transition sections. The bigger the thickness of intermediate transition zone is, the higher the tensile strength of the joint is. When adding 5 mm V/Cu composite transition sections, the average tensile strength of the joint is the maximum, which is 297 MPa, and the fracture occurs in the Cu transition zone, which belongs to ductile fracture.