Developments in multi-pass laser welding technology with filler wire
X. Zhang, Hitachi Research Laboratory, Hitachi Ltd, Japan
Abstract:
This chapter presents the results of multi-pass laser welding of thick plates for type 316L stainless steels with filler wire. The lack of fusion can be prevented by optimizing the relationship between laser power intensity and the deposited metal volume. The solidification crack, which usually occurs in the weld metal of the build-up passes, can be suppressed by controlling the chemical composition of the filler wire. The maximal tensile residual stress and the range of the tensile stress of the laser welded joint are lower than those of the conventional gas tungsten arc welding (GTAW).
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