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S18 Processos Mecânico-Metalúrgicos |
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Title:
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IN-PROCESS MONITORING OF DYNAMIC RESISTANCE ON RESISTANCE WELDING AND EVALUATION OF YOUR RELATIONSHIP WITH NUGGET S MECHANICAL STRENGTH
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Summary :
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ABSTRACT. IN THIS WORK, A TECHNIQUE OF DYNAMIC RESISTANCE MONITORING WAS USED DURING WELD PRODUCTION AND RELATED WITH ITS MECHANICAL STRENGTH. A SYSTEM WAS DEVELOPED TO MONITOR WELDING CURRENT, WELDING VOLTAGE AND THE FORCE APPLIED BY THE ELECTRODES. DYNAMIC RESISTANCE WAS OBTAINED BY THE RELATIONSHIP BETWEEN THE FIRST TWO VARIABLES AND THE FORCE WAS USED AS AN AUXILIARY VARIABLE. MECHANICAL STRENGTH OF THE WELD WAS EVALUATED BY THE TENSILE-SHEAR TEST. IT WAS VERIFIED THAT WELDS OF LOWEST MECHANICAL STRENGTH SHOWED A SUDDEN FALL IN THE DYNAMIC RESISTANCE CURVE. IT WAS CONCLUDED THAT ACTING ON THE FORCE WOULD ALLOW TO CORRECT THIS PROBLEM AND OBTAIN WELDS WITH HIGHER MECHANICAL STRENGTH. IT WAS FOUND THAT A CONTROL SYSTEM BASED ON DYNAMIC RESISTANCE, HAVING THE FORCE AS AUXILIARY VARIABLE, WOULD BE CAPABLE TO GUARANTEE WELD QUALITY.
KEY WORDS: RESISTANCE WELDING, IN-PROCESS MONITORING, DYNAMIC RESISTANCE, MECHANICAL STRENGTH
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Author :
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Bracarense, Alexandre Queiroz
Fonseca, Eduardo Teixeira
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Paper View :
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