TWI

A rotating data logger system was developed to investigate the influence of process parameters on tool tip temperature during friction stir spot welding (FSSW) of AA 6061-T6 and 5083-O aluminium alloy lap joints. The data logger was designed to rotate with the main spindle at speeds up to 3000 rpm and incorporated a variable data sampling rate to ensure adequate resolution. The FSW probe contained holes equipped with chromel thermocouples. Spot FSW experiments were undertaken in a cross-tension configuration at rotational speeds of 500-2000 rpm, welding time of 1-3 s, and a tool shoulder penetration depth fixed at 0.1 mm under the plate surface. Welded joints were characterised by tensile strength tests. Issues discussed include the effect of probe geometry on FSSW thermal cycles and the correlation between thermal distribution and probe temperature.

9th International Symposium, 15-17 May 2012, Session 5A: Process I, Paper 03