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Large-caliber nickel base composite pipe X groove no-back surface argon filling welding method

A welding method and technology for composite pipes, applied in welding equipment, welding accessories, arc welding equipment and other directions, can solve the problems of affecting the integrity and plasticity of welded joints, expensive nickel-based alloy welding materials, and high interlayer temperature, etc. The effect of saving gas filling time, saving welding time, and thickness of deposited metal

Active Publication Date: 2018-09-14
CHINA NAT CHEM ENG THIRD CONSTR
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Otherwise, using nickel-based alloy welding consumables first and then carbon steel welding consumables will inevitably cause the interlayer temperature of the iron-nickel-based alloy Incoloy825 to exceed 100°C, which will affect the integrity and plasticity of the welded joints
Nickel-based alloy welding consumables are expensive, and a large amount of welding consumables is required for welding large-diameter composite pipes; and for large-diameter pipes, the amount of argon gas required for argon back protection is also increased, which further increases the cost
Argon back protection requires multiple steps to check the quality, the steps are cumbersome, and the welding time is long

Method used

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Embodiment 1

[0028] The diameter of the nickel-based alloy composite pipe welded in this embodiment is Φ508 mm, the thickness of the base layer Q245R is 16 mm, and the thickness of the cladding layer Incoloy825 is 5 mm. figure 1 It is a circular weld X-shaped groove, the groove angle α is 65°, the root gap b is 2mm, the blunt side length p is 2mm, and the distance h from the root of the base groove to the joint surface of the base layer and the composite layer is 3mm.

[0029] The welding steps are: processing grooves on the end faces of two nickel-based alloy composite pipes to be welded, and then connecting the two ends to form a circular weld, the circular weld is figure 1 The X-shaped groove shown; adopt double-sided welding, first use carbon steel wire electrode to weld the base layer, and then use nickel-based alloy wire electrode to weld the transition layer and cladding layer in turn; the whole welding process does not use argon back protection. When welding, two operators are used...

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Abstract

The invention provides a large-caliber nickel base composite pipe X groove no-back surface argon filling welding method. A base layer of a nickel base alloy composite pipe is Q245R; a composite layeris Incoloy825; and the pipe diameter is not smaller than 500 mm. The method firstly adopts carbon steel welding wires and welding strips to weld the base layer, and then, uses welding wires and welding strips of nickel base alloys for welding a transition layer and the composite layer. The argon back surface protection is not used in the whole welding process, so that a lot of argon is saved, andwelding steps are simplified; and the base layer is welded by common carbon steel, so that the welding material cost is low, and the welding layer number is low. The method shortens the construction period, saves the energy, reduces the emission, and achieves excellent economical benefit and social benefit.

Description

technical field [0001] The invention belongs to the technical field of pipeline welding, and in particular relates to a large-diameter nickel-based composite pipe X-groove welding method free of back argon filling. Background technique [0002] Incoloy 825 is a fully austenitic nickel-iron-chromium alloy stabilized by titanium, and copper and molybdenum are added. It has acid and alkali corrosion resistance in both oxidizing and reducing environments. It is a typical heat-resistant alloy and can be used at high temperatures. high pressure media. Q245R is a kind of carbon steel with high rigidity, which can provide better mechanical properties. The composite pipe made of Q245R and Incoloy825 uses Q245R as the base layer and Incoloy825 as the cladding layer. It combines the excellent properties of the two materials, so it is more and more widely used in the petrochemical industry. [0003] For the welding of Q245R and Incoloy825 composite pipes, in the traditional method, th...

Claims

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Application Information

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IPC IPC(8): B23K9/16B23K9/32
CPCB23K9/16B23K9/32
Inventor 程国华苏玉贤吴燕张少宾段秀丽宋丽
Owner CHINA NAT CHEM ENG THIRD CONSTR