Ultrasonic resistance welding of TRIP-780 steel
Ultrasonic resistance welding of TRIP-780 steel
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DOI：
10.1016/j.jmatprotec.2019.116287
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发表时间：
2019-12
影响因子：
6.3
通讯作者：
U. Shah;Xun Liu
中科院分区：
文献类型：
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作者：
U. Shah;Xun Liu
提出了一种复合超声电阻点焊工艺，将大功率超声振动与常规电阻点焊工艺相结合。在此基础上研究了镀锌相变诱发塑性（TRIP-780）钢的焊接性。超声波电阻焊与常规电阻点焊相比，表现出熔核拔出的破坏模式和更好的延展性。光学显微镜和扫描电子显微镜分析表明，超声电阻焊焊缝熔合区和热影响区的组织得到细化。常规电阻点焊的熔合区存在聚结贝氏体，而超声波电阻焊中观察到可能的回火马氏体和羽毛状贝氏体，这解释了其较高的延展性行为。
A hybrid ultrasonic resistance spot welding process is developed, which integrates high-power ultrasonic vibrations into conventional resistance spot welding process. Weldability of galvanized transformation induced plasticity (TRIP-780) steel is studied based on this process. Ultrasonic resistance welds showed nugget pullout failure mode and more ductility compared with conventional resistance spot welds. Optical and scanning electron microscopic analysis revealed the refined microstructure in the fusion zone and heat affected zone of ultrasonic resistance welds. Coalesced bainite is present the fusion zone of conventional resistance spot welds while possible tempered martensite and feathery bainite is observed in ultrasonic resistance welds, which accounts for their higher ductile behavior.