Residual Stress Reduction with the LTT Effect in Low Carbon Manganese-Steel through Chemical Composition Manipulation Using Dissimilar Filler Material in Laser Beam Welding

This paper investigates the manipulation of chemical composition a laser weld by dissimilar filler material and its effect on residual stress. The aim is to minimize stresses in seam. In order negate stresses, combinations low-carbon manganese steel (S235JR) base with high-alloyed solid wires (G19 9 G25 20), as well similar low-alloyed wire G3Si1 are analyzed. goal show that so-called low-transformation-temperature can be used induce compressive without use specially manufactured wires. Chemical compositions generated within laser-beam-welding process means dilution, proving concept situ alloying usable affect martensite formation weld. Dilatometry measurements varying Cr Ni content reduces phase-transformation temperature increases dilatation. EBSD analysis indicates fully martensitic negligible amount retained austenite created while preserves ferritic-pearlitic microstructure. Residual stress hole-drilling method demonstrate reduction longitudinal tensile whereby magnitude induced depend Ms temperature. As result this research, it was proven targeted conventional materials possible. Under experimental conditions, seam could reduced 0 MPa. some cases, even achieved.