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ABSTRACT The galvanized ultra-high-strength steels are prone to liquid metal embrittlement (LME) cracking during resistance spot welding (RSW), cracking is facilitated by the specific temperature and stress conditions on the… Click to show full abstract
ABSTRACT The galvanized ultra-high-strength steels are prone to liquid metal embrittlement (LME) cracking during resistance spot welding (RSW), cracking is facilitated by the specific temperature and stress conditions on the steel surface. A two-dimensional electro-thermomechanical model was established to simulate the RSW of a galvanized Q&P980 steel, which was susceptible to LME. Temperature and stress histories in the welding area were obtained from simulation, they could well explain the occurrence of LME. A mild steel cover sheet was used during welding, which was placed between the Q&P980 steel and the electrode. It was found that the cover sheet modified the temperature and stress states on the surface of Q&P980 steels and made them less satisfying to LME, and consequently suppressed LME cracking.
Journal Title: Materials and Manufacturing Processes
Year Published: 2020
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