Influence of Assembly Gap Size on the Structure and Properties of SUS301L Stainless Steel Laser Welded Lap Joint
Open Access
- 20 February 2021
- Vol. 14 (4), 996
- https://doi.org/10.3390/ma14040996
Abstract
The microstructure and properties of laser welding lap joints with different assembly gap sizes are experimentally investigated. The laser weld joint is composed of γ-austenite and δ-ferrite, and the strip ferrite phase is mainly distributed at the austenite grain boundary. The weld metal presents the austenitic-ferritic (AF) solidification mode. When there is a gap between the two plates, a triangular region composed of similar equiaxed crystals can be found, and the size of the cellular crystals in this region decreases significantly. When the assembly gap size increases from 0.1 mm to 0.4 mm, the weld penetration state of the joint changes from full penetration to semi-penetration, and the surface collapse increases. The excessive size of the gap leads to a decrease in the tensile-shear force and fatigue strength of laser welded joints. In order to ensure that the surface morphology and properties of the welded joint meet the quality standard and requirement, the assembly gap should be less than 0.1mm.Funding Information
- CRRC Changchun Railway Vehicles Co., LTD (No.3J1203579416)
This publication has 18 references indexed in Scilit:
- Comparative investigation on single laser beam and dual laser beam for lap welding of aluminum alloyJournal of Laser Applications, 2020
- Investigation of metal mixing in laser keyhole welding of dissimilar metalsMaterials & Design, 2020
- Experimental Investigation of Laser Welding Process in Overlap Joint ConfigurationJournal of Materials Science and Chemical Engineering, 2019
- Dual beam laser keyhole welding of steel/aluminum lapped jointsJournal of the American Academy of Dermatology, 2018
- Mechanical properties of an innovative shear-clinching technology for ultra-high-strength steel and aluminium in lightweight car body structuresWelding in the World, 2016
- Impact of inter-sheet gaps on laser overlap welding performance for galvanised steelJournal of the American Academy of Dermatology, 2015
- Influence of the Gap Width on the Geometry of the Welded Joint in Hybrid Laser-Arc WeldingPhysics Procedia, 2015
- Effect of Fiber Laser–MIG Hybrid Process Parameters on Weld Bead Shape and Tensile Properties of Commercially Pure TitaniumMaterials and Manufacturing Processes, 2010
- Ti6Al4V sheets lap and butt joints carried out by CO2 laser: mechanical and morphological characterizationJournal of the American Academy of Dermatology, 2004
- Real time monitoring weld quality of resistance spot welding for the fabrication of sheet metal assembliesJournal of the American Academy of Dermatology, 2003