需焊接或热切割的表面应排除所有可能会损坏焊材或母材的杂物，如脂、油、灰尘、水垢、熔渣和油漆等。
Surfaces to be welded or thermally cut shall be cleaned of all foreign material such as grease, oil, dirt, scale, slag and paint that would be detrimental to either the weld or base material.
合金钢材料，表面镀镍，全密封焊接，防油、防水、耐腐蚀，可适用于各种环境。
Alloy steel, nickel plated, hermetically welded oil-proof, waterproof and anti-corrosion, suitable for all kinds of environments.
合金钢材料，全密封焊接，防油、防水、防一般腐蚀性气体及介质，可适用于各种环境。
Alloy steel, completely welded, oil-proof, waterproof and anti-corrosive gas and medium, suitable for all kinds of environments.
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