Features of formation of the welded seam of heat-resistant HN45VMTYUBR alloy depending on the modes of laser welding

The paper presents the results of investigations of the influence of the power and speed of the laser beam on the shape and dimensions of the welded seam of the high-temperature alloy HN45VMTYUBR after welding with a CO2 laser in various modes. It is established that at laser radiation powers above 3 kW in the entire welding speed range, the depth of the welded seam increases mainly due to the growth of the depth of the steam channel. In weld seams with a LR power of 3 kW and above, spherical pores and microcracks formation in the HAZ at the border of a welded seam the sizes from 0.1 to 0.3 mm are observed. The influence of heat input on the dimensions and shape of the welded seam is shown.