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The Arc Brazing by Variable Polarity AC Pulse MIG Welding Machine  

조상명 (부경대학교 신소재공학부 생산가공공학전공)
공현상 ((주)동화엔텍 연구개발부)
Publication Information
Journal of Welding and Joining / v.21, no.4, 2003 , pp. 56-62 More about this Journal
Abstract
MIG brazing is used for many parts without melting base metal because of high productivity. Pulsed MIG brazing can be used to further reduce heat input and to improve the process stability. However, a significant amount of zinc in galvanized sheet steel is burned off in the area of brazes. Therefore, the brazing method to reduce the heat input is needed. In the brazing for galvanized sheet steel, variable polarity AC pulse MIG arc brazing can be applied to more decrease the heat input by setting EN-ratio adequately. In this research, we studied for the variable polarity AC pulse MIG arc brazing to decrease the heat input by using ERCuSi-A wire. As the result of increasing EN-ratio, melting ratio of base metal and burning off of zinc were reduced in galvanized sheet steel.
Keywords
Galvanized sheet steel; MIG brazing; Arc brazing; Heat input; EN-ratio; Waveform control; Variable polarity AC pulse MIG arc brazing; Silicon bronze wire;
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