Electric heating – Metal heating – For bonding with pressure
Patent
1993-12-29
1995-09-12
Shaw, Clifford C.
Electric heating
Metal heating
For bonding with pressure
B23K 1124
Patent
active
054498775
ABSTRACT:
A weld controller utilizing a constant current control employs a stepper program for increasing current boost in predetermined percentage increments or steps following a predetermined stepper current profile to provide compensation for contact tip wear. The weld controller acquires weld power data in the form of current and voltage samples for each step of the stepper program, and computes Volt Amperes or power from this data during an acquisition run through the stepper program. The stepper program specifies a constant current at each step. Associated with each incremental current step, weld power that is required to produce that weld current is determined by the weld controller to generate a characteristic power curve. The power curve will be over the range of currents as specified by the combination of the programmed weld current and the range of current boost as specified by the stepper schedule. The weld controller will build a table of values relating weld current and delivered power or Volt Amperes. Once this table is complete, the table is available for an operator to edit, view, or copy into a characteristic power curve file for the weld system. Subsequent operations of the weld controller will utilize high and low power limit thresholds that track the nominal power profile. An event condition will be declared if the weld power is outside the lower or upper threshold. The thresholds can be defined as a fixed offset from the profile or as a percentage of the profile at each step of the stepper program. This allows the use of power limits to be established in close proximity to the nominal weld power at all times, enabling the use of tighter tolerances.
REFERENCES:
patent: 3445621 (1969-05-01), Schomer
patent: 3546421 (1970-12-01), Meyer et al.
patent: 4516008 (1985-05-01), Jones
patent: 4945201 (1990-07-01), Ito et al.
patent: 5083003 (1992-01-01), Clark, Jr. et al.
Buda Paul R.
Hinton Mark A.
Femal Michael J.
Golden Larry I.
Graefe Richard J.
Shaw Clifford C.
Square D Company
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