Dissimilar autogenous full penetration welding of superalloy K418 and 42CrMo steel by a high power CW Nd:YAG laser

Numerical simulation and experimental investigation of laser overlap welding of Ti6Al4V and 42CrMo

“…The chemical composition of Fe, Cr, Mn, Mo, and Si in this region are 97.79 at.%, 1.05 at.%, 0.57 at.%, 0.33 at.%, 0.26 at.%, respectively. Liu et al (2007) found the similar microstructure features in laser penetration welding of superalloy K418 and 42CrMo steel. Fig.…”

Transmission electron microscopy characterization of laser welding cast Ni-based superalloy K418 turbo disk and alloy steel 42CrMo shaft

“…Chemical composition of the particles enriched in Nb were identified as (Fe + Cr + Ni, 56.2%) and (Nb + Mo + Ti, 38.5%), which is generally possess the form of (Ni, Cr, Fe) 2 (Nb, Mo, Ti) and has a MgZn 2 type hexagonally closed packed (hcp) Laves crystal structure. This result is somewhat different with our previous work [12]. In that case, Laves particle possess the chemical composition of (Fe + Cr + Ni, 70%) and (Nb + Mo + Ti, 28%) under the investigation of SEM-EDS.…”

“…But presently, laser power levels are still limited for the material thickness involved. Recently, we have successfully made the full penetration butt welding joints between K418 and 42CrMo flat plates with the same thickness of 3.5 mm by appropriate selection of processing parameters [12]. Although the microhardness of the laser-welded seam was lower than that of the base metal, the strength of the joint was equal to that of the base metal and the fracture mechanism showed fine ductility.…”

Experimental and numerical study on laser keyhole welding of 42CrMo under air and argon atmosphere

“…7b. Such different surface rippling phenomena can be ascribed to different fluid flow patterns in the weld pool, oxidation of metal in high temperature, and the Kelvin-Helmholtz instability [24] at the interface between the molten layer and the plasma plume.…”

“…Alternatively, highpower-density laser has attracted enormous research interest and found its wide application in a broad branch of manufacturing areas including selective laser sintering and three-dimensional printing [1][2][3][4][5][6], surface nanostructuring [7][8][9][10][11][12], multimaterial joining and integration [13][14][15][16][17], material removal [18,19], and mechanical/optical property enhancements [20][21][22][23]. Characteristics, such as contact-free processing, good flexibility and tunablity, high efficiency, and throughput, make laser a feasible route for welding of 42CrMo [24,25]. Compared with conventional fusion welding process, laser welding has the advantage of high welding speed, narrow heat-affected zone, low distortion, and ease of automation.…”