| 摘要 |
PURPOSE:To reduce roughness and ruggedness after brazing and to inhibit tarnish and corrosion by residual cleaning soln., by specifying the compsn. of an Ag alloy filler metal for brazing. CONSTITUTION:This Ag alloy filler metal for brazing has a compsn. consisting of, by weight, 20-40% Cu, 0.001-1.5% P, 0.001-1.0% Si and the balance Ag. The reason that P and Si are contained in the Ag alloy filler metal is that P and Si reduce the surface tension of the filler metal during brazing, suppress the surface roughening of the filler metal and inhibit the occurrence of ruggedness. The P and Si contents are limited because <0.001% P or Si can not inhibit the surface roughening of the filler metal and the occurrence of ruggedness and >1.5% P or >1.0% Si enhances the flowability of the filler metal. By the enhanced flowability, the filler metal flows to a part of a base metal not to be brazed and deteriorates the corrosion resistance and fine appearance. In addition, >1.5% P or >1.0% Si imparts unfavorable influence on brazing strength.
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