Abstract
Abstract The characteristics of liquid metal embrittlement (LME) cracks combined with the location, amount, and length of the resistance spot-welded joint of galvanized advanced high-strength steel were comprehensively investigated in this study. To better illustrate the features of LME cracks, a multilayer grinding and polishing technique was employed to more comprehensively reflect the existence of LME cracks compared with that of a single-layer technique. Based on the crack observation results of the cross section of the center weld, the longest type-I and type-II cracks were approximately 322.2 and 106.7 μm, respectively. On the contrary, the longest type-I and type-II cracks were approximately 1,062.9 and 194.7 μm, respectively, for the multilayer grinding and polishing technique. The existence of liquid zinc for more time and the resultant tensile stress at the center of the weld can trigger crack propagation, eventually resulting in type-I cracks that are longer than type-II cracks. Similarly, severe LME cracks mainly exist in the central position of the welded joint, implying that temperature and stress can have a crucial effect on the formation and propagation of LME cracks.
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