Iron white copper pipe welding process and welding auxiliary tool

Abstract

The invention relates to the technical field of special pipe welding, and discloses an iron white copper pipe welding process which comprises pretreatment, bottoming layer welding, filling layer welding and capping layer welding, and further discloses a welding auxiliary tool which comprises a gas discharging pipe, a blocking plate and a gas conveying pipe. Compared with the prior art, the method has the following advantages and effects that the best welding method is found by utilizing the material characteristics of the iron white copper pipe made of the copper-nickel alloy material, welding defects such as welding pores, slag inclusion and incomplete fusion are avoided to the greatest extent, the problem that the welding starting time is judged by depending on worker experience is solved, and the welding efficiency is improved. The problem of automatic wire filling TIG welding of the iron white copper pipe is solved, the problems that a copper-nickel alloy material has many alloy components, the welding quality is unstable and only manual TIG welding can be adopted are solved, conversion from manual operation welding to mechanical welding is achieved, the welding quality and the working efficiency can be effectively improved, and the labor intensity and the difficulty of an operator are reduced.

Description

technical field [0001] The application relates to the technical field of special pipe material welding, in particular to a welding process of a white copper pipe and a welding auxiliary tool. Background technique [0002] At present, the new material of copper-nickel alloy iron cupronickel pipe has better mechanical properties and corrosion resistance, and is the best option for the production of marine engineering and large ship piping systems. Therefore, iron is used in the construction of large ships and marine engineering. The white copper pipe replaces the traditional material for the transportation of water, oil and other liquids. The copper-nickel alloy material has complex chemical composition and many alloy elements. In order to meet the conditions of use, the butt weld is required to be welded on one side and formed on both sides. 100% X-ray inspection according to NB / T47013.2-2015 standard, which increases the difficulty of welding. At present, the copper-nickel ...

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Problems solved by technology

[0002] At present, the new copper-nickel alloy iron white copper tube material has better mechanical properties and corrosion resistance, and is the best option for making marine engineering and large-scale ship piping systems. White copper pipes replace traditional materials as pipelines for water, oil and other liquids. The chemical composition of copper-nickel alloy materials is complex and there are many alloy elements. 100% X-ray inspection according to NB / T47013.2-2015 standard, which increases the difficulty of welding

At present, copper-nickel alloy iron-white copper pipes are all welded by manual TIG. The quality of welding has a great relationship with the skill level of the operators. The skill level of the welding operators is high, especially in thick-walled pipes. The labor intensity of the construction personnel during welding is high, and the welding quality is unstable. For example, a skilled welder needs more than 4 hours to complete the welding of a Φ160×9mm nozzle, and it cannot guarantee that 100% X-ray inspection is qualified, which seriously affects Normal and orderly construction of products

At present, there is no specification and method for automatic welding of white copper pipes in the existing technology. In the process of manual welding, the experience of workers is also relied on. It is impossible to directly convert manual welding into automatic welding, which increases production costs.

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