Journal
WELDING IN THE WORLD
Volume 64, Issue 3, Pages 501-511Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s40194-020-00847-w
Keywords
Laser hybrid welding; Solidification cracking; Thick-walled steels; Partial penetration; High-power laser beam
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Funding
- Projekt DEAL
- Research Association for Steel Application (FOSTA)
- Federation of Industrial Research Associations (AiF)
- German Federal Ministry for Economic Affairs and Energy (BMWi Bundesministerium fur Wirtschaft und Energie) [19582N]
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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.
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