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doi:https://doi.org/10.5781/JWJ.2019.37.3.7    [Epub ahead of print]
The Tensile Strength Comparison of 6xxx and 7xxx Series Aluminum Sheet Weldment using Laser Beam Welding and Friction Stir Welding Process
Jason Cheon*, Minjung Kang*, Jin-young Yoon*, Cheolhee Kim*
*Joining R&D Group, KITECH, Incheon, 21999, Korea
Correspondence: Cheolhee Kim  Email: chkim@kitech.re.kr
Received April 4, 2019  Accepted April 22, 2019  Published online May 29, 2019
ABSTRACT
Due to the high thermal diffusivity and metallurgical sensitivity, the proper welding processes of the aluminum are required. The Laser beam welding and friction stir welding processes have been focused as the appropriated welding processes for aluminum. The heat treated 6xxx series and 7xxx series aluminum sheet were welded by the laser beam welding and friction stir welding processes. Also, the effects of heat input through the welding parameters were investigated. The tensile strength of weldments was evaluated respectively and compared by the processes and heat input level. The insignificant tensile strength differences were found for the 6xxx series by the welding processes. However, the friction stir welded 7xxx series weldments were shown 82~89% joint efficiency while laser beam welded weldment were shown 48~58%. Overall, the effect of heat input level was not revealed in this experiment range. The degradations in hardness of weldments tended to be in proportion to the joint efficiency loss.
Keywords: Laser beam welding | Friction stir welding | Aluminum alloy | Tensile strength | Thermal diffusivity
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