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Argon arc welding technological method for nickel base alloy tubes

A technology of nickel-based alloy and process method, applied in welding medium, welding equipment, metal processing, etc., can solve problems such as incomplete penetration, overheating of weld metal, and lack of fusion, and achieve excellent welding quality and beautiful weld shape Effect

Active Publication Date: 2015-07-08
中国石油天然气第一建设有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a nickel-based alloy pipe argon arc welding process, which is suitable for centrifugal casting ZG45Ni35Cr25NbM nickel-based alloy pipe argon arc welding, and solves the problems of thermal cracks, overheating of weld metal, unfused and unwelded roots during welding Penetrating defects, so that the welded joint has high temperature oxidation resistance, corrosion resistance and good high temperature mechanical properties

Method used

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  • Argon arc welding technological method for nickel base alloy tubes
  • Argon arc welding technological method for nickel base alloy tubes
  • Argon arc welding technological method for nickel base alloy tubes

Examples

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Effect test

Embodiment 1

[0023] The diameter of a ZG45Ni35Cr25NbM nickel-based alloy pipe centrifugally cast in a certain project is φ108×10.8mm. The specific implementation steps are as follows:

[0024] (1) The welding material is ERNiCr-3, the length is 1m, and the diameter of the welding wire is φ2.0mm; the welding wire is cleaned with acetone and dried; the protective gas is argon with a purity of ≥99.99%.

[0025] (2) if figure 1 As shown, the nickel-based alloy tube 1 and the nickel-based alloy tube 2 are machined into a V-shaped butt joint groove, and the angle of the groove is α is 65° without blunt edges. Clean the surface within the range to remove the hardened layer, burrs, etc. that affect the welding quality, and use acetone to clean the oil stains, various marks, and impurities around the groove and the groove.

[0026] (3) After cleaning the groove and its surroundings, use PT to test. If there is no crack on the surface, it is qualified. After passing the test, wash off the penetrati...

Embodiment 2

[0032] The centrifugal casting ZG45Ni35Cr25NbM nickel-based alloy pipe in a project has a diameter of φ141×18mm, which is a service pipe that has been used. The specific implementation steps are as follows:

[0033] (1) Selection of welding materials. According to the content of alloying elements in the quality certification document of the material, the straight welding wire ERNiCr-3 with a nickel content percentage greater than that of the base metal and relatively less harmful impurity elements such as S and P is selected. The length is 1m and the diameter of the welding wire is φ2.0mm. ; The welding wire is cleaned with acetone and dried; the protective gas is argon with a purity of ≥99.99%.

[0034] (2) if figure 1As shown, the nickel-based alloy tube 1 and the nickel-based alloy tube 2 are machined into a V-shaped butt joint groove, and the angle of the groove is α, which is 70° without blunt edges. Clean the surface within the range to remove the hardened layer and bu...

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Abstract

The invention discloses an argon arc welding technological method for nickel base alloy tubes. The argon arc welding technological method includes the following steps of selecting welding materials; conducting blanking and machining grooves, wherein cold cutting is adopted for blanking, and the grooves are machined; clearing the grooves and surfaces around the grooves, wherein areas in the range from 50 mm to100 mm around the grooves are cleared; conducting PR detection on the grooves; conducting connector pairing, wherein a pairing gap is controlled within the range from 1 mm to 2 mm, and no staggered edges exist; conducting backing welding, wherein backing welding is conducted sectionally and symmetrically; conducting filling and cosmetic welding, wherein a multilayer and multichannel welding mode is adopted, welding interlayer temperature is controlled not to exceed 100 DEG C, and specific welding technological parameters are set; conducting postwelding inspection. The argon arc welding technological method can effectively solve the problems that during welding of centrifugal casting ZG45Ni35Cr25NbM nickel base alloy tubes, hot cracks exist, weld metal is overheated, incomplete fusion occurs and roots of welds are not fused. Satisfying welding quality of nickel base alloy tubes is achieved, and use performance of nickel base alloy tubes is guaranteed.

Description

technical field [0001] The invention relates to the technical field of welding technology, in particular to an argon arc welding technology method for a nickel-based alloy tube. Background technique [0002] Nickel-based alloy is an alloy formed by adding Cu, Cr, Mo, Nb, W, Ti, Al and other elements based on Ni or Ni-Fe. The material has good high temperature oxidation resistance, corrosion resistance and good high temperature mechanical properties. Based on the superior performance of nickel-based alloys, it has been widely used in petrochemical, nuclear industry, aerospace and other fields. [0003] Centrifugally cast ZG45Ni35Cr25NbM nickel-based alloy pipes in petrochemical plants are prone to welding defects such as thermal cracks, overheating of the weld metal, and lack of fusion during welding construction. Especially, the repair of thermal cracks is more difficult to deal with, and often only rewelding through cuts To avoid secondary thermal cracks. Therefore, it i...

Claims

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Application Information

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IPC IPC(8): B23K9/167B23K35/30B23K9/235B23K9/022B23K101/06
CPCB23K9/022B23K9/167B23K9/235B23K35/304B23K2101/06
Inventor 洪宾院王云峰霍继生杨铭王磊王国红王涛岳乐邓光明杨文军王历明丁泓竣
Owner 中国石油天然气第一建设有限公司
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