Laser Oscillating of Nickel Alloyed Welds on Press-hardened Steel

Laser oscillating welding was employed to fabricate Al-Si coated press-hardened steel (PHS) to improve the element homogeneity in the fusion zone. Three oscillation amplitudes that are 0 mm, 0.5 mm and 1.3 mm were studied in this present. Ni foil of 0.06 mm thickness was used as an interlayer between two tailored PHS welded. Welds defects was absent for any oscillation amplitudes, and weld width increased with increasing oscillation amplitudes. Compared to linear laser welding, Ni and Al had an uneven elemental profile due to strong stirring force, full martensite was achieved in fusion zone. However, δ-ferrite was present with oscillation amplitudes increased to 1.3 mm, since Ni content had a sharp descent compared to Al. Tensile srtength of welded joints was not influnced by altering oscillation amplitudes.