Evaluation of Crack Sensitivity and Gap Bridging Ability during Laser Butt Welding of Aluminum 5J32 and 6K21 Alloys

Young Nam Ahn; Cheol Hee Kim

doi:10.4028/www.scientific.net/MSF.695.247

Paper Titles

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Effect of Particle Size Distribution on the Workability of Alumina-Based Castable Refractories
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Effect of Heat Treatment Temperature and Atmosphere on Micro Structure of Polyphenylcarbosilane
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Effects of Physical Melt Treatments on Microstructural Evolution and Anodizing Characteristics of Al-Si Casting Alloys
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Evaluation of Crack Sensitivity and Gap Bridging Ability during Laser Butt Welding of Aluminum 5J32 and 6K21 Alloys
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Preparation and Hydrogen Permeation on Al₂O₃-CuO-ZnO (ACZ)/Co Membrane by Hot Press Sintering (HPS)
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Fabrications and Evaluations of Hydrogen Permeation on Al₂O₃-CuO-ZnO(ACZ)/Pd Coated Membrane
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Fabrications and Evaluations of Hydrogen Capacities on MgH_X-Transition Metal Oxide(TMO) Composites by Mechanical Alloying
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Improvement of Strength of Lotus-Type Porous Aluminum through ECAE Process
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HomeMaterials Science ForumMaterials Science Forum Vol. 695Evaluation of Crack Sensitivity and Gap Bridging...

Evaluation of Crack Sensitivity and Gap Bridging Ability during Laser Butt Welding of Aluminum 5J32 and 6K21 Alloys

Abstract:

Growing demand to reduce fuel consumption has accelerated the application of Al sheets to the body structure of automobiles. While recent studies on laser welding of Al 5xxx series and Al 6xxx series alloys have examined weldability, the laser autogenous welding usually results in low gap bridging capability and weld defects such as porosity, underfill, cracking, and so on. In this study, we evaluated the gap bridging capability and the crack sensitivity during laser autogenous welding, laser welding with filler wire, and laser-arc hybrid welding, respectively. Al 5J32 and 6K21 sheets were used as the base metal and Al 4xxx series and Al 5xxx series wires were used as the filler metal. Employing adequate welding conditions, the gap bridging capability during butt welding was investigated for each welding process. To clarify the solidification crack sensitivity, bead-on-plate welding was implemented for a tapered specimen as a self-restraint crack test. Compared with the laser autogenous welding, laser welding with filler wire and the laser-arc hybrid welding showed improved gap bridging capability and reduced crack sensitivity.