Friction stir welding high strength low alloy steel using a multilayer approach
- Lim Y.C. ,
- Sanderson S. ,
- Mahoney M. ,
- et al
- Lim Y.C. ,
- Sanderson S. ,
- Mahoney M. ,
- Wang Y.L. and
- Feng Z.L.
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With the aim of overcoming the thickness limitations of conventional friction stir welding (FSW), a multilayer multirun FSW process was developed in which six layers of ASTM A516 G70 (0.18%C, 1.1%Mn, 0.08%Cr, 0.16%Ni, 0.04%Mo, 0.02%Ti, 0.03%Al, 0.32%Cu) high strength low alloy steel plates (thickness 6 mm) were joined to fabricate a layered assembly. A CS4 tool design with a convex scroll shoulder step-spiral pin was used and was made from MS80 grade polycrystalline cubic boron nitride. The bottom layer was welded with a butt joint geometry, subsequent layers were stacked and joined with partial penetration, but the last two layers were tack welded in order to cope with distortion and residual stresses. Welding was performed at a spindle speed of 180-250 rpm to maintain a constant tool temperature. Microstructure was observed by optical microscopy and SEM. Mechanical properties were characterised by Vickers hardness measurements and Charpy impact tests.
10th International Symposium, 20-22 May 2014, Session 5B: Steel II, Paper 04
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