Researchers develop high-speed #FSW technique for #aluminum joining at high volume production speeds
… For more than a decade, research related to the production of aluminum TWBs has been available. Specific studies describing the weldability of aluminum sheets have characterized numerous joining techniques including laser, electron beam, gas tungsten arc, and FSW. Each methodology has been shown to have specific advantages and disadvantages associated with the joining of aluminum alloys, which overall have proven much more problematic than welding automotive steel sheets. These difficulties are inherent in the physical chemistry of aluminum alloys and are most apparent when striving to manage a weld pool of molten aluminum. In this state, aluminum maintains a higher affinity for hydrogen than the surrounding atmosphere, so the association of hydrogen in the weld pool is common even with the use of traditional cover gases. Exfoliating during the solidification process, th...