Procedure Development for Improved Quality Single and Dual LBW of Dissimilar Metals

摘要

In a previous investigation, sound welds were successfully performed on dissimilar steels using laser beam welding (LBW), taking advantage of the reduction of distortion and residual stresses this process affords. Some problems, however, were encountered due to the composition of the filler metal and the way it was introduced into the joint. In this work, an improvement of weld metal quality is sought through the simultaneous melting of two different filler materials with either single or dual LBW. The experimental work included metallographic observations, hardness tests, SEM microanalysis and estimation of phases on melt zones using the WRC-1992 diagram. The results showed that it is possible to obtain crack-free mi-crostructures of satisfactory composition.