Abstract
Microstructure and alloy element distribution of dissimilar joint 316L and EH36 in laser welding were researched, especially the influence of misalignment on weld profile and alloy element distribution. Weld zone (WZ) consisted of austensite and ferrite (F), and heat affected zone (HAZ) of EH36 side consisted of martensite, F, pearlite and carbide precipitation. Positive misalignment increased both upper and bottom widths (BWs), while negative misalignment made BW wider and upper width narrower. HAZ in steel EH36 side was clear and was narrowed and homogenised by negative misalignment. Alloy element contents of Cr and Ni in WZ was much more in negative misalignment. The interface transition gradient of alloy element between 316L and WZ was sharpened in the +0.8 mm misalignment, but diminished in the −0.8 mm misalignment. The influence of misalignment on alloy element distributions can be attributed to the effect of gravity on transient flow of weld pool.
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