Hot cracking during laser welding of steel: influence of the welding parameters and prevention of cracks

Marcel Schaefer; Steffen Kessler; Philipp Scheible; Nicolai Speker; Thomas Harrer

doi:10.1117/12.2254424

22 February 2017 Hot cracking during laser welding of steel: influence of the welding parameters and prevention of cracks

Marcel Schaefer, Steffen Kessler, Philipp Scheible, Nicolai Speker, Thomas Harrer

Author Affiliations +

Proceedings Volume 10097, High-Power Laser Materials Processing: Applications, Diagnostics, and Systems VI; 100970E (2017) https://doi.org/10.1117/12.2254424
Event: SPIE LASE, 2017, San Francisco, California, United States

Abstract

In continuous wave keyhole-mode laser welding of high strength steel alloys hot cracking can occur. The hot crack susceptibility depends on the mutual interaction of several factors like the welding parameters, the alloy composition and the weld fixturing. In this paper we focus on the influence of the welding parameters and investigate the dependency of the laser power, the welding speed and the laser wavelength on the crack formation. X-ray images are used to visualize the hot crack patterns, which exhibit a pronounced periodicity. To influence the hot crack formation, the incident energy input into the process was adapted. For specific welding parameters, we show exemplarily the prevention of hot cracking by the use of a twin-spot optics.

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Citation Download Citation

Marcel Schaefer, Steffen Kessler, Philipp Scheible, Nicolai Speker, and Thomas Harrer "Hot cracking during laser welding of steel: influence of the welding parameters and prevention of cracks", Proc. SPIE 10097, High-Power Laser Materials Processing: Applications, Diagnostics, and Systems VI, 100970E (22 February 2017); https://doi.org/10.1117/12.2254424

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