Laser lap-fillet welding was used to weld Al–Si-coated 22MnB5 steel. The effect of laser beam offset and filler wire on microstructure and mechanical properties of the joint was investigated. Weld depression was observed with the low laser beam offset. Increasing the laser beam offset or adding filler wire was beneficial to good weld appearance. The fusion zone (FZ) consisted of martensite (in Al-deficient regions) and \( \delta \)-ferrite (in Al-rich regions). The amount of \( \delta \)-ferrite with filler wire was less than that without filler wire when the other welding parameters were the same. Three different zones existed in the heat-affected zone (HAZ) with microstructures of martensite (inner HAZ), mixed martensite and ferrite (middle HAZ) as well as tempered martensite (outer HAZ). The outer HAZ with tempered martensite exhibited the minimum hardness (about 250HV_0.1). After the tensile test, the specimens with low laser beam offset were fractured at the FZ of the upper sheet, while the specimens with high laser beam offset (more than − 1 mm with filler wire and 1 mm without filler wire) were fractured at the HAZ (the soften zone, outer HAZ). The maximum tensile force was 9581 N with the laser beam offset of 2 mm and with addition of filler wire.

激光搭接角焊用于焊接涂有Al-Si的22MnB5钢。研究了激光束偏移和填充焊丝对接头组织和力学性能的影响。在低激光束偏移下观察到焊缝凹陷。增加激光束偏移量或增加填充焊丝有利于良好的焊接外观。熔合区（FZ）由马氏体（在Al不足的区域）和\（\ delta \）-铁素体（在Al丰富的区域）组成。的量\（\三角洲\）当其他焊接参数相同时，带填充焊丝的铁氧体小于不带填充焊丝的铁氧体。热影响区（HAZ）中存在三个不同的区域，其微观结构为马氏体（内部HAZ），马氏体和铁素体混合合金（中间HAZ）以及回火马氏体（外部HAZ）。带有回火马氏体的外热影响区表现出最低硬度（约250HV _0.1）。拉伸试验后，激光束偏移量低的样品在上层板的FZ处断裂，而激光束偏移量高的样品（带填充线的样品大于-1 mm，不带填充线的样品大于1 mm）断裂。 HAZ（软化区，外部HAZ）。最大拉力为9581 N，激光束偏移为2 mm，并添加了填充焊丝。