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）。

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).

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焊条与焊丝应该表面光洁，不能有表面缺陷和锈垢、油脂以及其他杂质，因为它们会影响焊接质量。

Rods and wires shall have a smooth finish, free from surface imperfections, corrosion products, grease or other foreign matter which would affect the quality of the weld.

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注：含杂质较多的线材不能焊接。

Notice : Wire materials that contain much impurity cannot be effectively welded.

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