DEVELOPMENT OF AUTOMATIC QUALITY CONTROL FOR RESISTANCE WELDS IN ALUMINUM ALLOYS. PHASE II. MODIFICATION OF CIRCUITRY AND EVALUATION OF A FEEDBACK WELD CONTROL FOR RESISTANCE SPOT WELDING ALUMINUM ALLOYS
An analysis was made of data on constant electrode voltage, constant weld current, and weld zone resistance change to determine the selection of three principles for weld feedback control of resistance spot welding of aluminum alloys. 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 necessary circuits were built in breadboard'' fashion and bench tested for continuity of signal. All circuits were integrated into a control system to be evaluated by resistance spot welding chemically cleaned 0.051'', 5456H343. 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 satis- t factorily during the tests to maintain weld size and strength we uring a qualification-type weld test. The control system 10 as desirable benefits as it provides an in-process control He ver the weld nugget development. (P.C.H.) co
- Research Organization:
- Budd Co. Materials Research Lab., Philadelphia
- DOE Contract Number:
- DA 36-034-ORD-3217 RD
- NSA Number:
- NSA-17-020429
- OSTI ID:
- 4696486
- Report Number(s):
- AD-294774
- Resource Relation:
- Other Information: Orig. Receipt Date: 31-DEC-63
- Country of Publication:
- United States
- Language:
- English
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