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The influence of Friction Stir Welding (FSW) on hydrogen content of ISO 3183 X80M high strength steel was evaluated for several welding conditions, including dry and underwater environments. The diffusible and non-diffusible (residual) hydrogen were measured by a hot extraction method that involved adaptation of ISO 3690 and AWS A4.3 (arc welding process) standards. It was found that FSW does not...