CASTINGS REPAIRE METHOD, USING THE ARC WELDING Russian patent published in 2017 - IPC B23P6/04 B23K9/04 

FIELD: metallurgy.

SUBSTANCE: bevelling for welding is provided on the defect to be repaired. Remove the defective section of the casting. Preliminary heating is carried out along the contour of the defective section, being repaired, for the width of at least 250 mm in the temperature range from 150 upto 250°C. Provide the overlapping of intermediate layer, the welded rollers, the facing rollers and the cooling of the welded joint. In this case, the intermediate layer overlapping is carried out by the two-layer metal deposition with the thickness of 3 upto 5 mm with the temporary tensile strength at 20-30% below the properties of the base metal and the relative elongation at 20-30% above the base metal of the casting to be repaired and the weld metal. The welded rolls overlapping is performed with covering of not more than 50% and holding of the interlayer temperature between the overlapping welded rollers in the temperature range from 150 upto 250°C. By the facing rollers overlapping along the contour of the defect to be repaired, form the weld belt with the width not exceeding 25 mm.

EFFECT: invention makes possible to increase the weld metal resistance to fracturing in the patch work.

3 cl, 3 dwg, 1 tbl