| 摘要 |
PURPOSE:To permit satisfactory soldering with high projection energy and short time by incorporating black powder which does not form a compd. with solder to a solder paste consisting of solder particles, flux and additives. CONSTITUTION:This solder paste 6 is composed of 90% solder particles, 1% carbon as black particles 7 and the balance flux. The black particles 7 transmit the projection energy to the solder particles and the solder paste 6 melts partly when laser light is projected to such paste 6. The paste is melted to a molten pad 5 and is then soldered via solder 5. The projection energy of the laser light, etc. can be increased and the quick satisfactory soldering is executed by using such black particles.
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