Influence of welding gases and filler metals on hybrid laser-GMAW and Laser-FCAW welds

Abstract

Hybrid Laser-Arc Welding (HLAW) is a relatively new joining technique that combines advantages from both laser beam welding and arc welding. The interaction between laser beam and arc welding provides advantageous synergic effects, especially for thick joints. On the other hand, this interaction brings extra complexity to HLAW, limiting its acceptance in industry. Therefore, it is still necessary to elucidate some features of HLAW, such as the influence of parameters and consumables on the characteristics of the resulting joints. In the present study, the effects of welding gases (Ar + CO2 in different proportions) and filler metals (solid and flux-cored wires) on thick S355 structural steel joints are assessed. The best welds in terms of geometric characteristics, microstructures, and mechanical behavior were fabricated with high CO2 content welding gases and flux-cored welding wires. The use of flux-cored wires promoted higher penetration, lower hardness, and formation of acicular ferrite, avoiding the formation of martensite encountered in joints welded with solid wires. Moreover, the application of flux-cored wires could lead to cost savings in future applications, by reducing the laser power required to produce sound joints.

Análise da tensão residual em soldagem de revestimento de aço AISI 347L em aço Cr-Mo através do método de medição por coordenadas

“…O efeito do CO 2 para amostra RV4 teve uma influência diferente de RV2, isso pode ser devido a uma maior taxa de resfriamento e outros efeitos térmicos associados, como maior energia de soldagem devido à maior condutividade térmica do CO 2 em relação ao Ar (630 e 430 W/K, respectivamente), fato também observado por TUSEK e SUBAN [48] e WALLERSTEIN et al [49]. MISHCHENKO e SCOTTI [50] explicam como a adição de calor aumenta o tamanho da poça de fusão e promove um aumento na taxa de fusão do arameeletrodo, levando a um reforço excessivo; a maior quantidade de metal fundido gera maiores esforços residuais durante a contração produto da solidificação.…”

Characterisation of weld bead and microhardness of SS316L weld overlays on S355J2+N steel using GTAW under E-type magnet

“…This study selected S355J2+N, a high-strength low-alloy (HSLA) steel [12], as the substrate material and SS316L as the overlay material. S355J2+N steel is widely applied in offshore and marine structures, pressure vessels and boilers, pipes, mining equipment, wind and water power plants, and power generation fields [12][13][14]. The chemical compositions of substrate and filler materials are shown in tables 1 and 2, respectively.…”

Recent Developments in Laser Welding of Aluminum Alloys to Steel

“…Hybrid laser-arc welding (HLAW) combines a laser beam and an arc source in order to produce a synergic welding process and overcome some limitations of the individual processes [91]. Thus, some approaches involving HLAW have also been proposed to join aluminum to steel.…”