


The mainstream manual butt welding process adopts TIG welding for root pass + SMAW for filling and capping. Strict control of temperature and heat input is implemented throughout the process to ensure the high-temperature creep strength and crack resistance of the welded joint.

Manual butt welding of P91 is suitable for the field installation and maintenance of high-temperature and high-pressure pipelines in power stations, petrochemical and nuclear power industries. With a mature and controllable process, it is a reliable manual welding solution for the butt joining of high-temperature pressure-bearing components.