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分别采用摆动焊与不摆动(直线)焊进行了12 mm厚7系铝合金的脉冲熔化极气体保护焊焊接,并对比分析了焊接接头显微组织和力学性能。显微组织分析表明,摆动焊时打底焊道只有少量柱状晶组织,其余均为较粗大的等轴晶组织,而不摆动焊打底焊道几乎全部为柱状晶组织,填充焊道和盖面焊道为较细小的等轴晶组织。力学性能测试结果显示,摆动焊接头抗拉强度、屈服强度均小于不摆动焊接;摆动焊时焊缝显微硬度值波动比不摆动焊大;摆动焊焊缝中心冲击功与不摆动焊差别不大,但热影响区的冲击韧性略高。以上结果是由于摆动焊接中热源沿焊缝方向移动速度慢,母材熔化多,热输入大导致的。
The pulse-melting gas-shielded welding of 12-mm-thick 7-series aluminum alloy was carried out by using wobble and non-wobble (straight line) welding respectively. The microstructure and mechanical properties of the welded joint were analyzed. The microstructure analysis shows that there is only a small amount of columnar grain in the base weld during the wobble welding and the rest are the coarser equiaxed grains, while the non-swivel welding base weld is almost all of the columnar grain structure, the filler bead and the cover Face weld for the smaller equiaxed grain structure. The test results of mechanical properties show that the tensile strength and yield strength of the wobble welded joint are all less than that of the non-wobbled welding; the microhardness of the welded joint fluctuates more than the non-wobbled welded steel; the difference between the center impact energy and non- Large, but the toughness of the heat affected zone is slightly higher. The above result is due to the swinging welding heat source moving along the direction of the weld slow, melting parent metal, heat input caused by a large.