拉丝表面焊接后的去划痕及毛刺。
图中的这位工人在一块钢板表面加热一块电脑电路板以取下焊接在上面的芯片原件。
In this photo, a worker heats a computer board on a steel surface to remove the computer chips soldered into it.
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.
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