汽车用镀锌钢板电阻点焊可焊性的研究

摘要

采用剥离试验、扫描电子显微镜和能谱仪等方法对比分析了不同镀层钢板对电阻点焊可焊性工艺窗口和电极磨损的影响规律.结果表明,与纯锌镀层钢板相比,锌铁合金镀层钢板的点焊工艺窗口要宽33%左右;连续点焊电极寿命约长4 000点,原因在于纯锌镀层更容易与电极帽中的铜发生合金化反应.%The effects of different coatings on the weldability and electrode wear of automotive galvanized steel sheet in resistance spot welding are comparatively analyzed by peeling test, scanning electron microscopy and energy dispersive spectrometry.The results show that compared with pure Zn coated steel, the welding process window of Fe-Zn coated steel is 33％ wider and the lifespan of its electrode is much longer ( some 4,000 spots more).The reason of the latter is that alloy reaction with copper in electrode tip is easier to happen for pure-Zn coating.