Electric heating – Metal heating – By arc
Patent
1989-06-20
1990-05-15
Albritton, C. L.
Electric heating
Metal heating
By arc
21912164, B23K 2600
Patent
active
049260227
ABSTRACT:
A method of reflow soldering an electrical lead to a solder pad using a laser in which the solder pad, rather than the terminal, is irradiated by the laser beam. The pad becomes hot enough to melt the solder which efficiently transfers the thermal energy to the lead. Upon removal of the laser beam, the solder sets forming an intimate electrical and mechanical connection between the common areas of the lead and pad. To practice the process, the solder pad should extend out beyond the portion of the lead in contact with the pad by a distance equal to or exceeding the diameter of the laser beam used in the bonding process.
REFERENCES:
patent: 3402460 (1968-09-01), Smith
patent: 3610874 (1971-10-01), Gagliano
patent: 3718968 (1973-03-01), Sims et al.
patent: 3952180 (1976-04-01), Gnanamuthu
patent: 4404453 (1983-09-01), Gotman
patent: 4531044 (1985-07-01), Chang
patent: 4714815 (1987-12-01), Swarts et al.
Albritton C. L.
Digital Equipment Corporation
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