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In order to achieve in-service safety evaluation of girth weld, property prediction of X80 self-shielded flux-cored girth weld metal based on strain ageing kinetics was conducted. Strength increment ( ΔY ) and toughness reduction ( ΔCVN ) relationship was obtained through tensile and Charpy impact test using specimens before and after strain ageing. 1% prestrain was conducted and then aged at different conditions (150°C/100°C for 1–6 h, 80°C/50°C for 1–120 days). Strain ageing kinetics was investigated based on experiment results, and diffusion activation energy ( Q ) was calculated as 88.1 kJ/mol. The correlation equation of ageing temperature and period was obtained:,  T1 &lt; T2  &lt;423 K. It is predicted that, since occurrence of 1% prestrain, toughness of girth weld metal would drop down to &lt;80 J after 3.9 years service in the present case, and its service safety should be reconsidered. Other prediction should be based on experimental results of specific consumable and welding parameters.

In-service property prediction of X80 self-shielded flux-cored (FCAW) girth weld metal based on strain ageing kinetics