| 摘要 |
PROBLEM TO BE SOLVED: To improve productivity of partial soldering. SOLUTION: There are provided a flux applying process 2, where a flux is applied to a partial soldering part of a substrate at which partial soldering, is performed, a preliminary heating process 3 where at least a partial soldering part of the substrate with the flux coated is preliminary heated, while the substrate is transported, and a partial soldering process 4 where the partial soldering part of the substrate which has been preliminary heated is soldered.
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