MATHEMATICAL MODELLING OF THERMAL FIELD FOR RESISTANCE SPOT BRAZING OF STAINLESS STEELS WITH AMORPHOUS BRAZING ALLOY

摘要

Brazing stainless steels is difficult either due to the presence of hard stable oxides formed by some alloying elements as Cr, Mo, Mn, Si, Ti, Al on part's surfaces or by chrome carbides separation as a result of high brazing temperatures (800-1000℃). To avoid these problems brazing stainless steels should be performed at high heating and cooling speeds. Experimental researches investigated resistance spot brazing joints between austenitic stainless steel plates using an amorphous brazing alloy. The paper presents results of structural characterization of the brazed together with an analytical model that simulates thermal field during brazing. The model simulates accurately thermal processes that took place during brazing and confirmation of its precision is proved by structural analysis of the brazed joints.