Porosity and solidification cracking in welded 45 mm thick steel by fiber laser-MAG process

Document identifier: oai:DiVA.org:ltu-75764
Access full text here:10.1016/j.promfg.2019.08.015
Keyword: Engineering and Technology, Materials Engineering, Manufacturing, Surface and Joining Technology, Teknik och teknologier, Materialteknik, Bearbetnings-, yt- och fogningsteknik, Laser welding, Hybrid welding, Solidification cracking, Porosity, Thick steel, Mechanical properties, Produktionsutveckling, Manufacturing Systems Engineering
Publication year: 2019
Relevant Sustainable Development Goals (SDGs):
SDG 9 Industry, innovation and infrastructureSDG 11 Sustainable cities and communities
The SDG label(s) above have been assigned by OSDG.ai

Abstract:

Porosity and solidification cracking in joining of thick sections are very common issues in deep penetration keyhole laser-arc hybrid welding (LAHW). In the present work, 45 mm thick high strength steel was joined by a double-sided technique. With combined use of fast welding speeds and larger air gap between plates, higher amount of porosity was found because of the dynamic behavior of the keyhole walls. Solidification cracking formed at the centerline in the bottom of the weld due to high-depth-to-width geometrical ratio. Numerical simulations have been performed and showed very high cooling rate and stresses occurred in the root of the deep welds, which corresponds with higher cracking tendency.

Authors

Ivan Bunaziv

SINTEF Industry, Trondheim, Norway
Other publications >>

Jan Frostevarg

Luleå tekniska universitet; Produkt- och produktionsutveckling
Other publications >>

Xiaobo Ren

SINTEF Industry, Trondheim, Norway
Other publications >>

Alexander Kaplan

Luleå tekniska universitet; Produkt- och produktionsutveckling
Other publications >>

Odd M. Akselsen

SINTEF Industry, Trondheim, Norway
Other publications >>

Record metadata

Click to view metadata