Friction stir welding of high temperature alloys: lessons learned
- Steel R. ,
- Packer S. ,
- Larsen S. ,
- et al
- Steel R. ,
- Packer S. ,
- Larsen S. ,
- David T. ,
- Fleck D. and
- Mahoney M.
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Description
Based on lessons learned from the MegaStir research programme devoted to friction stir welding (FSW) of high temperature alloys and with the aim of producing high quality, defect free welded joints while maximising tool life, a report is presented into topics such as tool design, tool material selection, weld set up, plunge procedure, transition to equilibrium FSW conditions, process parameters, weld depth, and manual parameter adjustments based on visual observations. Issues discussed include polycrystalline cubic boron nitride (PcBN) tool life, the wear resistance, fracture toughness and transverse rupture strength of Q series and MS series PcBN FSW tools, the liquid cooled low run out tool spindle, a temperature telemetry system, inert cover gas and workpiece surface condition, anvil considerations, and weldment microstructure dependence on tool rotational speed.
11th International Symposium, 17-19 May 2016, Session 4A: High Temperature I, Paper 01
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