Gas shielded welding wire for core bar local repair and welding technology

Abstract

The invention relates to a gas shielded welding wire for core bar local repair for an H13 seamless steel pipe. The gas shielded welding wire is prepared from, by mass, 0.04%-0.09% of C, 0.2%-0.5% of Si, 1.0%-1.8% of Mn, 1.5%-3.0% of Ni, 0.7%-1.90% of Mo, 0.0030%-0.0150% of S, 0.018% or less of P, 0.89%-1.0% of V, 1.0%-6.0% of Cr, 0.04%-0.2% of Cu, 0.055%-0.2% of Nb, 0.02%-0.04% of Als and the balance iron and inevitable impurities. The gas shielded welding wire has excellent welding manufacturability, is applicable to repair welding of a damaged core bar, and can prolong the service life of the repaired core bar.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a gas-shielded welding wire for partially repairing mandrel rods and a welding process. Background technique [0002] In recent years, my country's seamless steel pipe production enterprises have increased the intensity of technological transformation and investment, and the technical equipment has been greatly improved. The stop mandrel used in the continuous pipe rolling mill is used as an important deformation tool for steel pipe production, which seriously affects the quality of the inner surface of the steel pipe. and steel pipe production costs. The mandrel is the main consumption part in the production unit of the steel pipe industry, and more than 50% of the production and maintenance costs of the continuous rolling mill equipment are used for the consumption and replacement of the mandrel. [0003] There are many factors that affect the life of the mandrel, such as stee...

AI Technical Summary

Problems solved by technology

[0004] The common material of mandrel is H13 die steel, that is, 4Cr5MoSiV1. After a long period of harsh service environment, there will often be scratches on the surface of mandrel, which seriously affects the quality of the inner surface of seamless steel pipe. However, because of the long production cycle of die steel itself, the production cost is high If there is a problem during its service and it is easily replaced and scrapped, it will cause a substantial increase in the production cost of the enterprise, and it is also a manifestation of excessive energy consumption