Electric heating – Metal heating – For bonding with pressure
Patent
1988-11-29
1991-07-16
Shaw, Clifford C.
Electric heating
Metal heating
For bonding with pressure
219 8518, 219 8516, 219 8511, 219553, B23K 100
Patent
active
050327038
ABSTRACT:
Simultaneous solder connections of multiple electrical terminals to respective electrical leads is achieved by conducting thermal energy from an actuable heater body (10,40,50,60,70) to the multiple connection sites via the terminals (20,21,45) themselves, the terminals being formed integrally with the heater body. The terminals are scored, perforated, etc., to facilitate severence from the heater body after soldering. The preferred heater body takes the form of a copper substrate (17,27,41,51,61) having a skin depth surface layer (19,29,43,53,63,65) of magnetically-permeable, high resistance alloy. Alternating current of constant amplitude and high frequency is passed through the heater body and concentrated in the surface layer at temperatures below the Curie temperature of the alloy. For higher temperatures the current is distributed through the lower resistance substrate to limit further heating. During the time interval required for the surface layer to reach its Curie temperature, the resistive power dissipation creates sufficient thermal energy to melt solder that is pre-deposited on the terminals and/or leads.
REFERENCES:
patent: 2759161 (1956-08-01), Berg
patent: 3589591 (1971-06-01), Schwenn
patent: 3750252 (1973-08-01), Landman
patent: 3820055 (1974-06-01), Huffnagle et al.
patent: 4788404 (1988-11-01), Kent
Standard Search Report, 9/13/89.
Henschen Homer E.
McKee Michael J.
Pawlikowski Joseph M.
AMP Incorporated
Shaw Clifford C.
Smith David L.
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