Effect of Preheating on Hot Cracking Susceptibility in Pulsed Laser Welding of Invar Alloy

Abstract

Hot cracking is a serious problem in welding of Invar alloy. The weld hot cracking susceptibility of Invar was evaluated using pulsed laser welding on fish-bone sheet experiment. The pulse wave consisted of preheating pulse and welding pulse. Hot cracks that formed along the grain boundary propagated from the weld upper surface to the inside. The experiments show that adding a preheating pulse can effectively reduce the hot cracking susceptibility of Invar alloy. Finite Element Modeling (FEM) calculations and experimental measurement results show that the welding temperature gradient and cooling rate decrease with increasing preheating pulse duration. However, as the preheating pulse duration increases, the hot cracking susceptibility of the Invar alloy does not decrease all the time, but decreases first and then increases. This is because the increase of heat input leads to the increase of shrinkage plastic strain when the preheating pulse duration increases. The maximum tensile strength of the butt welded joint of the Invar alloy was 467.3 MPa, which is 92.3% of the base metal when the preheating pulse duration is 3 ms.

Study on the Influence of Weld Spacing on the Tensile Strength of Laser Double-Pass Reciprocating Welding of DP780/6061-T6 Dissimilar Metals

“…Relevant studies have shown that preheating can reduce the heat input, temperature difference, and residual stress during welding, and affect the thickness of the IMCs, the tensile strength of the welded joint, and the characteristics of the fracture surface of the weld [ 16 , 17 , 18 ]. At present, the relevant experiments are mainly realized by the overall preheating of the plate, the local preheating by double laser beams, and the local preheating by hybrid welding.…”