METHOD OF WELDING OF BASE STRUCTURES MANUFACTURED OF STEEL Russian patent published in 1997 - IPC

FIELD: shipbuilding, oil-and-gas producing industries. SUBSTANCE: automatic, semiautomatic and hand electric arc welding is carried out by positive polarity DC current. To reduce residual and angular deformations in multiple bead welds at butt joining, vees of edges are filled up in the following sequence: when welding curvilinear seams first seam from inner side of skin is filled up completely and then seam from outer side of skin is completely welded up. When welding straight-line seams first of all vee at side of framing is filled up flush with main metal and than, after gouging and cleaning, seam at other side is welded up than welding of seam from first side is finished. Automatic and semiautomatic hidden-arc welding is carried out in downhand position. Hand arc and semiautomatic welding of seams and backing of seam root are carried out with dividing of seam into sections of equal length. EFFECT: improved quality of weld seam. 14 cl, 3 dwg, 18 tbl