Properties Evaluation of the Welded Joints Made by Disk Laser

Ján Viňáš; Janette Brezinová; Henrich Sailer; Jakub Brezina; Miroslav Sahul; Pavlo Maruschak; Olegas Prentkovskis

doi:10.3390/ma14082002

Materials (Apr 2021)

Properties Evaluation of the Welded Joints Made by Disk Laser

Ján Viňáš,
Janette Brezinová,
Henrich Sailer,
Jakub Brezina,
Miroslav Sahul,
Pavlo Maruschak,
Olegas Prentkovskis

Affiliations

Ján Viňáš: Department of Technology, Materials and Computer Aided Production, Faculty of Mechanical Engineering, Technical University of Košice, 040 01 Košice, Slovakia
Janette Brezinová: Department of Technology, Materials and Computer Aided Production, Faculty of Mechanical Engineering, Technical University of Košice, 040 01 Košice, Slovakia
Henrich Sailer: Department of Technology, Materials and Computer Aided Production, Faculty of Mechanical Engineering, Technical University of Košice, 040 01 Košice, Slovakia
Jakub Brezina: Department of Technology, Materials and Computer Aided Production, Faculty of Mechanical Engineering, Technical University of Košice, 040 01 Košice, Slovakia
Miroslav Sahul: Department of Welding and Joining of Materials, Faculty of Materials Science and Technology in Trnava, Slovak University of Technology in Bratislava, 917 24 Trnava, Slovakia
Pavlo Maruschak: Department of Industrial Automation, Ternopil Ivan Puluj National Technical University, 46001 Ternopil, Ukraine
Olegas Prentkovskis: Department of Mobile Machinery and Railway Transport, Vilnius Gediminas Technical University, Plytinės g. 27, LT-10105 Vilnius, Lithuania

DOI: https://doi.org/10.3390/ma14082002
Journal volume & issue: Vol. 14, no. 8
p. 2002

Abstract

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The process of laser welding of sheets of HSLA (high-strength low-alloy steel), DP600 (dual-phase steel) and TRIP steels was investigated. A weld was successfully made in a double-sided hot-dip galvanized sheet with a thickness of 0.78–0.81 mm using a laser power of 2 kW per pass without any pretreatment of the weld zone. Microstructure studies revealed the presence of martensitic and ferritic phases in the weld zone, which could be associated with a high rate of its cooling. This made it possible to obtain good strength of the weld, while maintaining sufficient ductility. A relationship between the microstructural features and mechanical properties of welds made in the investigated steels has been established. The highest hardness was found in the alloying region of steels due to the formation of martensite. The hardness test results showed a very narrow soft zone in the heat affected zone (HAZ) adjacent to the weld interface, which does not affect the tensile strength of the weld. The ultimate tensile strength of welds for HSLA steel was 340–450 MPa, for DP600 steel: 580–670 MPa, for TRIP steel: ~700 MPa, respectively, exceeding the strength of base steels.

Published in Materials

ISSN: 1996-1944 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering; Technology: Engineering (General). Civil engineering (General); Science: Natural history (General): Microscopy; Science: Physics: Descriptive and experimental mechanics
Website: http://www.mdpi.com/journal/materials/

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