铜对钢/铝激光-MIG复合焊接头组织及性能的影响
Effects of Cu on microstructures and properties of laser-MIG hybrid welded joint of steel/aluminum
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摘要: 采用激光-MIG复合焊方法研究了铜对SYG960E超高强度度钢/6061铝合金焊接接头微观组织及力学性能的影响.结果表明，与MIG焊相比，激光-MIG复合焊有利于改善焊缝成形及焊接质量.钢/铝界面层具有双层结构，靠近铝焊缝侧为针状的FeAl3金属间化合物，而靠近钢母材侧为条状的Fe2Al5金属间化合物.铜对钢/铝界面层及接头的力学性能具有显著的影响.添加铜后可以有效地减小界面层厚度和裂纹敏感性，降低钢/铝接头的最高硬度，明显提高接头的抗拉强度，接头强度可以提高110%，这主要与铜抑制界面层生长和改善界面层中Fe-Al金属化合物的脆硬性有关.Abstract: Effects of Cu on microstructures and mechanical properties of laser-MIG hybrid welded joint of SYG960E ultra-high strength steel to 6061 aluminum were studied. The experimental results showed that compared with MIG welding, laser-MIG hybrid welding was beneficial to improve the weld appearance and welding quality. The interface layer of steel and aluminum has a double-layer structure consisting of needle-like FeAl3 intermetallic compound at aluminum side and strip-like Fe2Al5 intermetallic compound at steel side. The Cu has great effect on the interface layer and mechanical properties of steel-Al joints. When the Cu is added, the thickness of interface layer, the crack sensitivity and maximum micro-hardness of steel-Al joints will be decreased, and the tensile strength of steel-Al joints will be increased by 110%. It is related to that Cu can restrain the growth of interface layer and decrease the brittleness of Fe-Al intermetallic compounds in the interface layer. Therefore, the addition Cu is an effective way to improve the microstructures and mechanical properties of laser-MIG hybrid welded joints of ultra-high strength steel to aluminum.
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