Stainless steel weldment and pad combined welding method

A stainless steel weldment and pad combined welding method, comprising steps of:

• (a) respectively processing and pairing butts of to-be-welded portions of two weldments, wherein, during pairing, inner walls of the two weldments are aligned at the same plane;
• the butts of the two weldments are opposed to form a V-shaped groove with an angle α;
• and between bottoms of the butts of the two weldments is kept a gap L of 2-4 mm;
• (b) providing a copper pad at the gap between the bottoms of the butts of the two weldments, wherein the copper pad closely attaches to the inner walls of the two weldments;
• (c) welding the V-shaped groove to form a root pass;
• and
• (d) removing the copper pad, and filling the root pass to be welded into a cover pass, wherein the copper pad is 2 mm thick, 20-30 mm wide, and 100-200 mm long;
• the copper pad is manually inserted from external sides of the two weldments, through the gap between the bottoms of the butts, into the inner sides of the weldments to closely attach to the inner walls of the two weldments;
• and the copper pad is manually held to synchronously move with an arc.