Capillary action will work properly only when the surfaces of the metals are clean. If they are "contaminated" - coated with oil, grease, rust, scale or just plain dirt - those contaminants have to be removed. If they remain, they will form a barrier between the base metal surfaces and the brazing materials. An oily base metal, for example, will repel the flux, leaving bare spots that oxidize under heat and result in voids.
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12 июл 2017
