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采用双光束光纤激光热源对1.5 mm厚5083铝合金和1.8 mm厚304不锈钢异种合金搭接接头进行了激光深熔焊接工艺实验,研究了光束相对位置对接头焊缝成形、界面组织及接头力学性能的影响.结果表明,在无任何填充材料条件下,采用双光束激光进行铝合金/不锈钢异种合金激光深熔焊接能够获得良好的焊缝表面成形,小能量分光束在前的接头界面金属间化合物(IMC)厚度相对较薄.接头界面纳米硬度测试结果表明,IMC层平均硬度为9.61 GPa,且明显高于不锈钢母材(4.12 GPa)和铝合金母材(1.09 GPa).接头拉伸断裂于铝合金/不锈钢IMC界面层.小能量分光束在前的接头获得机械抗力大于分光束在后的接头.
Laser welding of 1.5 mm thick 5083 aluminum alloy and 1.8 mm thick 304 stainless steel dissimilar alloy lap joint was carried out by using double-beam fiber laser heat source. The welding beam forming, interfacial microstructure and mechanical properties of joints The results show that using double beam laser for laser welding of aluminum alloy / stainless steel dissimilar alloy can obtain good weld surface forming, small energy beam splitting before interface interface intermetallic compound (IMC) was relatively thin.The results of nano-hardness test showed that the average hardness of IMC layer was 9.61 GPa, which was significantly higher than that of stainless steel (4.12 GPa) and aluminum alloy base (1.09 GPa) Aluminum / Stainless Steel IMC Interface Layer Small Energy Sub-Beam The front connector gains mechanical resistance greater than the sub-beam rear connector.