Effect of filler wire on laser welded blanks of Al-Si-coated 22MnB5 steel
Effect of filler wire on laser welded blanks of Al-Si-coated 22MnB5 steel
复制标题
填充焊丝对Al-Si涂层22MnB5钢激光焊接毛坯的影响
DOI：
10.1016/j.jmatprotec.2018.04.041
复制
发表时间：
2018-09-01
影响因子：
6.3
通讯作者：
Wu, Dongsheng
中科院分区：
文献类型：
--
作者：
Lin, Wenhu;Li, Fang;Wu, Dongsheng
采用碳钢填充焊丝解决了22 MnB 5铝硅涂层激光焊板的涂层问题。研究了填充焊丝对熔合区组织和力学性能的影响。Al含量被填充焊丝稀释。在减少Al和均匀化之后，δ-铁素体相也减少。接头强度接近1210 MPa，伸长率为1.1%。当使用填充焊丝时，接头强度提高到1550 MPa，延伸率大于3%。焊接接头的断口为韧性断口。研究了焊接速度和送料速度对焊接质量的影响。发现在较高进料速度下减少Al含量或使用较低焊接速度是最有效的，因为这两种方法都能够添加更多的填充材料以降低熔合区中Al-Si涂层的比率。在不存在填充焊丝的情况下，δ-铁素体相大且长，连接到体区。当使用填充焊丝时，δ铁素体相被破碎，变得窄而小，并均匀地分布在马氏体基体中。
Carbon-steel filler wire was used to solve the coating problem in laser welded blanks of Al-Si-coated 22MnB5 without a decoating procedure. The effect of the filler wire on the fusion-zone microstructure and mechanical properties was investigated. The Al content was diluted by the filler wire. The delta-ferrite phase was also reduced after the reduction in Al and homogenization. The joint strength was similar to 1210 MPa, and the elongation was 1.1% without filler wire. When filler wire was used, the joint strength increased to 1550 MPa, and the elongation was greater than 3%. The fracture surface of the joint with the filler wire was ductile. The effects of welding speed and feeding speed were also studied. A reduction in the Al content at the higher feeding speed or the use of a slower welding speed was found to be most effective because either approach enabled more filler material to be added to lower the ratio of the Al-Si coating in the fusion zone. In the absence of the filler wire, the delta-ferrite phases were large and long, connecting to a bulk zone. When the filler wire was used, the delta-ferrite phases were broken up and became narrow and small with a uniform distribution in the martensite matrix.