Year-end Sale % OFF 
Abstract
The aim of the present study is to investigate the influence of the laser hybrid welding parameters on the solidification cracks in the weld root for partial penetration welding. Welding trials were performed on thick-walled high-strength steels of grade S690QL under the same critical restraint intensity, with a variation of the welding velocity, wire feeding rate, and the focal position of the laser beam. It was ascertained that the welding velocity has a high impact on the solidification cracking phenomenon. A decrease in the welding speed leads to a reduction of the number of cracks in the weld root. The arc power has also a slight influence on the solidification cracking, while the change of the focal position of the laser beam shows also a remarkable effect. Besides, numerical simulation was performed to understand the thermomechanical behavior of the welds for different welding parameters to assist the interpretation of the experimental results.
Highlights
In recent years, laser-based welding processes such as laser beam welding (LBW) or hybrid laser-arc welding (HLAW) became important welding processes in welding of thick materials
The cross sections were extracted at the positions, where solidification cracks were determined
The weld shapes let conclude that the welds are formed to a wine-cup shape which is typical for HLAW
Summary
Laser-based welding processes such as laser beam welding (LBW) or hybrid laser-arc welding (HLAW) became important welding processes in welding of thick materials. The coupling of the laser beam and arc welding in one process zone has been presented at the end of the 1970s [1]. A thin film of liquid is present between the dendrite structures, which leads to the formation of hot cracks if the highly localized strains in the liquid films exceed their critical limits. This liquid film contains impurities, low-melting eutectic, and iron sulfide (FeS), which has a solidus temperature of 988 °C [8]. Hot cracks will occur if the strain during solidification exceeds the deformation capacity. Hot cracks are formed if the shrinkage rate exceeds the feeding rate
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
