Method of joining metallic members, and joined metallic members
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United States of America Patent
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Apr 24, 2001
Grant Date -
N/A
app pub date -
Oct 13, 1998
filing date -
Oct 13, 1997
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Abstract
Disclosed is a method of joining metallic members together. The metallic members are coated with an undercoat composed of an alloy of tin and zinc and contacted with each other through a mixture containing a solder comprising tin and zinc and a flux, while heating the metallic members to melt the solder. Then the molten solder is solidified to join the metallic members. Here, the ratio of zinc in the undercoat is represented by x (% by weight), the ratio of zinc in the solder is represented by y (% by weight), and the ratio, x, and the ratio, y, are values within an area enclosed by the line A or B in FIG. 1, which satisfies the formulas: 1.ltoreq.x.ltoreq.20, 3.ltoreq.y.ltoreq.13 and 3.ltoreq.(x+y)/2.ltoreq.13, or formulas: 0.1.ltoreq.x.ltoreq.25, 2.ltoreq.y.ltoreq.15 and 2.ltoreq.(x+y)/2.ltoreq.15.
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