By comparing backgouging of plasma arc with carbon arc to the welded joint of 13-5 martensitic stainless steel, the backgouging of plasma arc is proved feasible for the full penetration weld.

It was found that impact toughness of weld metal was maximum using carbon arc air gouging, and it was minimum using acid backing.

The method of Carbon arc-welding is adopted. It is feasible in practice to be used in the material weld. The feedback from the user demonstrates the reliability of welding quality.