ISA INVERTER WELDING CONTROLS APPLICATION OF TECHNOLOGY

•Chaining,successive and spot welding modes•Squeeze delay,squeeze,cool and hold •Forge delay programming •Constant current and constant power feedback modes,fixed pulse open loop mode•Flexible stepper functions (including linear stepper option) •Monitoring limits – current / voltage / power / pulse width •Nine programmable impulses for temper sensitive materialssuch as high strength steels The ISA Series consistsof an inverter control packaged in a “NEMA”style cabinet,a versatile programming pendant (optional additional moni- toring pendant) and a range of matched industrial transformers optimized for total system performance and efficiency. Programming is simple:the user can set up to 64 weld schedules containing dual pulse welding profiles with upslope and downslope control.Time can be programmed in cycles or millisecond increments. Other key features include:

FEEDBACK MODES

Primary Constant Current RMS – acquires feedbackfrom a primary internal sensor. Primary Limit – acquires feedbackfrom a primaryinternal sensor.Fastest rise time. Secondary Constant Current RMS – acquiresfeedback from a secondary coil.Most accurate control of current and response to weld dynamics. Secondary Constant Power RMS Fixed Pulse – allows the pulse width to be fixed fora constant primary output. – acquirescurrent feedback from a secondary coil and voltage feedback from the voltage drop across the electrodes.Useful for coated steels,aluminum and oxidation problems,extends electrode life.

Technology

600, 800, 1000 Hz Power Supply Feedback WeldingTransformer Weld Head Schematic of Industrial inverter

Constant Current

•Delivers the same current regardless of resistance changes•Compensates for part thickness changes •Programmable upslope for round parts or to reduce splash and marking •When welding in constant current,monitor voltage and power

Constant Power

•Precisely varies the current and voltage to achieve consistent energy •Breaks up surface contaminants,oxides and plating •Ideal for automation,extends electrode life •When welding in constant power,monitor current and voltage
Representation of energy waveforms for wire-to-wire weld.