The waterproof layer of the lap joint should stick (welding) firm, tight sealing, no distortion, fold, curling and blister defects.

卷材屋顶防水层的搭接缝应粘(焊)结牢固，密封精密，不得有扭曲、皱折、翘边和起泡等缺陷。

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Steel surface should be no visible grease and dirt, and there is no attachment not firm scale, rust, paint and other impurities (water soluble salt and welding residue).

钢材表面应无可见的油脂和污物，并且没有附着不牢的氧化皮、铁锈和油漆涂层及其它杂质（水溶性盐和焊接残渣）。

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Feature: Wide suitability, firm welding spot, easy operation, stable function, safety& stability and so on.

特点：该机具有适应范围广、焊点牢固、操作方便、性能稳定、 安全可靠等优点。

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