METHOD FOR GAS SHIELD WELDING AT FORCED COOLING OF SEAM AND ZONE OF THERMIC INFLUENCE Russian patent published in 2004 - IPC

FIELD: electric arc gas shield welding.

SUBSTANCE: method comprises steps of shielding welded seam and adjacent to it portions of base metal by means of gas flow providing arc burning; feeding from downwards second gas flow for shielding back side of seam; feeding from downwards third gas flow directed onto metal being crystallized, onto crystallized metal of seam and onto metal in zone of heat influence and oriented outside along the same axis as gas flow shielding back side of seam and used for cooling. It allows to narrow width of seam, adjacent to it heat influence zone.

EFFECT: enhanced metal structure of welded seam and in heat influence zone.

3 dwg, 2 tbl, 2 ex