6.面板与龙骨连接紧密,表面平整,接缝均匀。无污染、折缺、缺棱掉角、锤伤、脱层、漏、透、翘角。
[5] Harlin N,Jones T B,Parker J ld growth mechanism of resistance spot welds in zinc coated steel. J Mater Process Tech . 2003