Method of utilizing CO2 gas shielded welding technology to weld boiler header parts

Abstract

The invention discloses a method of utilizing a CO2 gas shielded welding technology to weld boiler header parts, and belongs to the technical field of methods of welding the boiler header parts through CO2 gas shielded welding. The method comprises the steps that the first step, the bottom of a first layer of a pipe joint is sealed through argon arc welding; the second step, flux-cored carbon dioxide gas shielded welding is adopted by filling welding, and the pipe joint is placed at the vertical position to be welded; and the third step, when a surface layer covers the pipe joint, the pipe joint is located at the horizontal position, weaving welding is adopted, the angle of a welding gun is adjusted at any time, a weld joint can be located within the protection range of the carbon dioxidegas, and therefore the high-quality weld joint which is attractive in appearance and is free of internal defects can be obtained. Compared with manual arc welding, the method has the advantages that the welding efficiency is improved by 3-5 times. Only two pipe joints can be welded every day when the 150 * 20 pipe joints are welded through manual arc welding, and at least eight pipe joints can bewelded every day when CO2 gas shielded welding is used for welding. Slag-gas combined protection is adopted by CO2 gas shielded welding, the high-quality weld joint is more easily achieved, the deformation of a welded product is small, and the physical and psychological health of welders is facilitated.

Description

technical field [0001] The present invention relates to a method using CO 2 A method for welding boiler header parts by gas shielded welding technology, which belongs to CO 2 The technical field of gas shielded welding methods for boiler header components. Background technique [0002] At present, the header parts of boilers are mostly welded by traditional manual arc welding. The welding process of this welding method is relatively complicated. During the welding process, the header parts need to be heated to 150-200°C. The welder must weld within this temperature range. Due to the low efficiency of manual arc welding, the welding process cannot be performed well. Control the temperature of the welding area of ​​the entire product, which will cause the mechanical performance index of the entire product to fail to meet the standard requirements, greatly affecting the service life of the entire boiler. Also, due to the complex structure of the boiler header components, the...

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Problems solved by technology

The welding process of this welding method is relatively complicated. During the welding process, the header parts need to be heated to 150-200°C. The welder must weld within this temperature range. Due to the low efficiency of manual arc welding, the welding process cannot be performed well. Control the temperature of the welding area of ​​the entire product, which will cause the mechanical performance index of the entire product to fail to meet the standard requirements, greatly affecting the service life of the entire boiler

In addition, due to the complex structure of boiler header components, the spatial position of a single pipe joint varies greatly, which requires welders to have excellent practical operation skills

In addition, welders perform continuous welding in such a high-temperature environment, which will cause great harm to the physical and mental health of welders.

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