为降低镀覆在钢板表面的铝硅镀层对激光接头的不利影响,采用薄镀层热成形钢材料配合激光填丝焊技术,获得了焊缝内铝质量分数小于1%的激光填丝焊接头.对该接头进行了宏观及微观组织分析,发现热成形后焊接接头组织被全马氏体组织取代,避免了软化现象.力学性能分析表明,热成形前后试样的抗拉强度从约570 MPa提高到约1 500 MPa,接头的薄弱环节位于母材,高速拉伸对接头的抗拉强度没有不良影响,而断裂伸长率受影响较大.
To reduce the adverse effect of aluminum silicon coating layer on the surface of steel plate on laser joint,laser wire filler welding joint with aluminum mass fraction less than 1%in weld was obtained by using thin-coated hot-formed steel material and laser wire filler welding technology.The macro and microstructure of the welded joint were analyzed,it was found that the welded joint was replaced by the whole martensite structure after hot forming,which avoided the softening phenomenon.The mechanical property analysis shows that the tensile strength of the sample increases from about 570 MPa to about 1 500 MPa after hot forming,and the weak link of the joint is located in the base material.High speed tensile has no adverse effect on the tensile strength of the joint,but the elongation at break is affected greatly.