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To eliminate the tearing defect in friction stir welding (FSW) Ti-6Al-4V alloy joint, back heating assisted FSW (BHAFSW) method was put forward in this study. Using different back heating temperatures, joint formation and microstructure were mainly discussed. Results show that the temperature gradient along thickness plays a more important part than the welding peak temperature affecting the tearing...
To widen the parameter range for friction stir welding (FSW) of Ti–6Al–4V alloy, back heating assisted FSW (BHAFSW) technology was proposed in the present study. Both the conventional FSW and BHAFSW processes were used to weld 2.5mm thick Ti–6Al–4V alloy to investigate their performances. Results show that during conventional FSW, tearing defects always appear at the joint bottom and it can only be...
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