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DEVELOPMENT OF AUTOMATIC QUALITY CONTROL FOR RESISTANCE WELDS IN ALUMINUM ALLOYS. PHASE II. MODIFICATION OF CIRCUITRY AND EVALUATION OF A FREEDBACK WELD CONTROL FOR RESISTANCE SPOT WELDING ALUMINUM ALLOYS
BUDD CO PHILADELPHIA PA
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Three principles for w ld feedback control of resistance spot welding of aluminum alloys are constant electrode voltage, constant weld current, and weld zone resistance change. The latter principle proved to be the most reliable signal for a feedback system. The weld control circuits for a single phase feedback system were modified to produce a laboratory working model of a control for the three phase welding machine. The weld tests indicated the feedback control corrected for changes in the weld zone resistance, as the weld zone resistance decreased with the weld growth or development. This was in accordance with the correlation that as the weld grew larger the weld zone resistance decreased in a predictable and reliable manner. The weld control system performed satisfactorily during the tests to maintain weld size and strength during a qualification-type weld test. Author
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