| 摘要 |
PROBLEM TO BE SOLVED: To eliminate use of power from outside, prevent jet condition from changing by the adhesion of an oxide and prevent a bridge, an icicle, etc., from being generated. SOLUTION: In this method, primary soldering is performed for a printed board by the roughened jet waves of a primary jet nozzle, and then soldering is performed again with the gentle jet waves of a secondary jet nozzle. In this case, meandering waves are made by letting fused solder flow out of the narrow outlet 9 of a jet 5, and applying the fused solder having flown out to the entry side to the wall face 12 of a trough 10, and making it interfere with the fused solder surging from behind. Performing the soldering of the printed board with the meandering waves will enable the soldering without a bridge or an icicle.
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