Welding method for 10CrMo9-10 steel

Abstract

The invention discloses a welding method for 10CrMo9-10 steel. The method comprises the following steps of: S1), machining a welding groove to obtain an X-shaped groove, milling a piece to be welded by using an edge milling machine, wherein the groove angle is 70 degrees, cleaning the groove and parts in the ranges of 25mm on two sides of inner and outer walls of the groove until metal luster is exposed; S2), welding a positioning layer of the piece to be welded by a mixed gas protective welding mode; S3), welding a priming coat of the piece to be welded by the mixed gas protective welding mode; S4), welding a filling layer and a cover surface layer of the piece to be welded by a double-wire submerged-arc welding mode; and S5) tempering the welded piece to release stress, wherein the tempering temperature is 680 to 730 DEG C. A welded joint welded by the method has the high-temperature endurance strength, the creep limit, the physical property, the hydrogen resistance, the oxidation resistance, and the brittle fracture resistance which are basically the same as those of a base material; cold crack can be effectively prevented; high production efficiency can be achieved; and the welding process for the steel is greatly improved.

Description

technical field [0001] The invention relates to a welding method, in particular to a welding method applied to 10CrMo9-10 steel. Background technique [0002] With the rapid development of the thermal power station industry and the chemical industry, the demand for containers and pipes used in higher temperatures (350°C to 600°C) is also increasing. The materials used in traditional pipelines, such as Q345B, L360MB and other steels, are not suitable for thermal power stations and other high-temperature applications because they do not have sufficient thermal strength (high-temperature durability or creep strength) and sufficient pit oxidation and corrosion resistance. High engineering or parts. However, when heat-strength steel is used for welding production, multi-alloyed heat-strength steel has a greater tendency to cold cracking. In order to avoid cold cracking, traditional welding uses electrode arc welding, gas shielded welding, and single wire submerged arc welding. ...

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is to overcome the high-temperature endurance strength and creep limit, physical properties, hydrogen resistance and oxidation resistance, and resistance to brittle fracture of 10CrMo9-10 steel in the prior art in the weld seam and heat-affected zone Insufficient similarity to the base metal, providing a welding method for 10CrMo9-10 steel, assisting construction personnel to complete the welding work with high quality

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