Electric heating – Metal heating – For bonding with pressure
Patent
1996-07-29
1998-07-28
Simmons, David A.
Electric heating
Metal heating
For bonding with pressure
2191171, B23K 910, B23K 1124
Patent
active
057865582
ABSTRACT:
Inverter-resistance welding control, for any resistance welding machine and for any welding operation, which guarantees a welding current having a quick rise time and which is free from overshoot. In particular, when a maximum allowable current value of the resistance welding machine involved has been entered and a selected current value of a particular welding operation has been entered, a CPU computes an initial pulse width of a control pulse from the maximum allowable current value and the selected current value. In a first cycle of the welding operation, the CPU supplies a first control pulse having the initial pulse width to the inverter circuit to thereby start the welding operation. The initial control pulse width is determined as a function of a machine current capacity and the desired current level of a welding operation, and may be made in proportion to a relative magnitude (ratio) of the desired current to the machine current capacity. In the subsequent cycles of the welding operation, the CPU reads the measured current value of each cycle and compares it with a selected current value to compute the deviation of the measured current value. Based on the deviation, the CPU determines a next pulse width in order that the deviation will be cancelled.
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Miyachi Technos Corporation
Rivard Paul M.
Simmons David A.
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