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Gas-shielded welding wire and welding process for local mandrel repair

A technology of partial repair and welding process, applied in welding equipment, welding medium, welding equipment and other directions, can solve the problems of energy consumption, increase in production cost of enterprises, long production cycle of die steel, etc., to meet the requirements of use, reduce production costs, The effect of good welding manufacturability

Active Publication Date: 2021-02-23
ANGANG STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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Embodiment Construction

[0016] According to the invention, a gas-shielded welding wire for partially repairing mandrels for H13 seamless steel pipes, the chemical composition of the gas-shielded welding wire is: C 0.04%-0.09%; Si 0.2%-0.5%; Mn 1.0% ~1.8%; Ni 1.5%~3.0%; Mo 0.7%~1.90%; S 0.0030%~0.0150%; P≤0.018%; V 0.89%~1.0%; Cr1.0%~6.0%; %; Nb 0.055% to 0.2%; Als 0.02% to 0.04%; the balance is iron and unavoidable impurities.

[0017] A welding process for partial repair of mandrels, using the gas-shielded welding wire to perform on-line welding repairs on the mandrel; specifically comprising the following steps:

[0018] 1) Thoroughly clean the part of the mandrel to be welded and the gas-shielded welding wire used, including removing oil, rust and other impurities, and clean it with acetone at least once after cleaning;

[0019] 2) Manual tungsten argon arc welding is used to repair the mandrel, the welding torch is equipped with a ceramic nozzle, the current is controlled at 120-150A during weld...

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Abstract

The invention relates to a gas-shielded welding wire for partially repairing mandrels for H13 seamless steel pipes. The chemical composition of the gas-shielded welding wire is: C 0.04%-0.09%; Si 0.2%-0.5%; Mn 1.0%- 1.8%; Ni 1.5%~3.0%; Mo 0.7%~1.90%; S 0.0030%~0.0150%; P≤0.018%; V 0.89%~1.0%; Cr 1.0%~6.0%; Nb 0.055% ~ 0.2%; Als 0.02% ~ 0.04%; the balance is iron and unavoidable impurities. The gas-shielded welding wire of the present invention has excellent welding manufacturability, is suitable for repairing and welding the mandrel after being damaged, and can improve the service life of the repaired mandrel.

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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/30B23K9/16
CPCB23K9/16B23K35/3086
Inventor 魏勇武裕民王佳骥付魁军傅博项金杨韩严法王辉马俊男刘祥峰
Owner ANGANG STEEL CO LTD
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