Control of welding energy flux density

Details Control of welding energy flux density Control of welding energy flux density

1980-04-02

1982-08-10

Shaw, C. C.

Electric heating

Metal heating

For bonding with pressure

219109, B23K 1124

Patent

active

043439802

ABSTRACT:
An electrical resistance spot welding system and method is disclosed. The system has adjustable output power circuitry for applying electrical heating energy to a weld site by way of weld tips, in accordance with a welding operation. An energy monitor senses instantaneous accumulated energy applied during the welding operation, and terminates the operation when an adjustable predetermined total energy has been applied. Other circuitry monitors applied welding voltage, and derives therefrom a signal which is a function of the energy density per unit area applied at the weld site. Circuitry responds to the energy density sensing to control the energy monitor and the power circuitry to govern the total energy applied in the welding operation. As weld energy flux density decreases, such as happens when weld tips spread or "mushroom", total applied energy is increased, compensating for weld tip changes, thereby holding the amount of applied energy per unit of weld site area relatively constant from one welding operation to another.

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patent: 3980857 (1976-09-01), Sciaky
patent: 4024371 (1977-05-01), Drake

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