Abstract
In this paper, pulsed Nd: YAG laser welding of 321 austenitic stainless steel and 630 (17-4PH) precipitation hardening martensitic stainless steel is being studied. The joints had a circular geometry and butt welded. Studies were focused on the effects of laser power, welding velocity, beam diameter and pulse duration on the depth and width of the welds. Microstructures of the welded joints were investigated by the optical microscopy (OM), scanning electron microscopy (SEM). The results show that both weld depth and weld width increase with voltage. In addition, the welding speed and pulse duration have bi-lateral effects on the weld bead depth and width. Very fine cellular and dendritic structures are achieved in the weld zone. The microstructure in the weld metal is found to be austenitic-feritic or martensitic.
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