Steel can be friction stir welded, but since the tool gets red hot, it is necessary to protect it against the enviroment using a shielding gas. The following movie illustrates the friction stir welding of interstitial-free steel, provided by Hidetoshi Fujii, Osaka University (JWRI), Japan. It takes a while before the plate becomes sufficiently heated to proceed with welding.
More details on:
http://www.msm.cam.ac.uk/phase-trans/2003/FSW/aaa.html
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