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A manual tungsten argon arc welding process for nickel alloy process pipes

A technology for argon tungsten arc welding and process piping, applied in welding equipment, metal processing, arc welding equipment, etc., can solve the problems of uneven arc dwell time, unstable arc length, and high requirements for welders' skills, and achieve good welding results. , The effect of low welding difficulty and reasonable welding process

Active Publication Date: 2017-11-24
江苏利柏特股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In actual welding, the arc stays on both sides of the groove unevenly, and the arc length is unstable, resulting in defects such as poor appearance, lack of fusion, pores and even incomplete penetration of the root.
In general, the requirements for welder skills are high, and the welding quality is unstable

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0042] The present invention will be described in further detail below through specific examples.

[0043] A nickel alloy process pipeline manual tungsten argon arc welding process, comprising the following steps:

[0044] A. Preparation before welding, including the following sub-steps:

[0045] A1) Selection tool: choose a 75° argon arc welding torch with a diameter of 40-50mm 2 Handle wire with a length of 3-4m, cerium tungsten electrode with a diameter of 2.0mm or 2.4mm, the tip of the cerium tungsten electrode is processed into a truncated conical shape with a taper of 35°-45°, and the diameter of the small circle of the truncated cone is 0.8-1.0mm. The protruding length of the tungsten electrode relative to the porcelain nozzle of the argon arc welding torch is 6-8mm;

[0046] A2) Acceptance inspection of pipes and tools: check the grade and specification of the pipe to ensure that the grade of the pipe is N08825, the diameter D>Φ13mm, δ>1.5mm; During the validity per...

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Abstract

The invention discloses a manual tungsten-electrode argon arc welding process for a nickel alloy process pipeline. The manual tungsten-electrode argon arc welding process comprises the following steps: A, preparation before welding; B, fitting up; C, tack welding; D, examination before welding; E, manual welding, wherein a direct current straight polarity forehand welding is employed for multi-pass vertical-up welding, and the step E comprises the following substeps: E1) determining welding process parameters; E2) determining a welding position, an arc starting position and a welding direction of backing welding; E3) backing welding; and E4) forming a second layer of deposited metal and a rear layer of deposited metal on a backing welding deposited metal pass; F, examination of various objective factors of welding in the welding process; and G, examination after welding. When a grade N08825 nickel alloy process pipeline is welded by use of the welding process, such advantages as beautiful weld joint appearance, even weld lines, small heat input amount, dense structure, stable weld joint quality and low welding difficulty can be achieved.

Description

technical field [0001] The invention relates to a welding process, in particular to a manual tungsten argon arc welding process specially for nickel alloy process pipes with the brand name N08825. Background technique [0002] The internal cleaning requirements of the N08825 process pipeline are relatively high. Manual arc welding, single-sided welding and double-sided forming technology can guarantee the welding quality, but the slag on the root surface cannot be completely removed, which cannot meet the requirements for cleanliness inside the process pipeline, and the scope of application is limited. However, argon tungsten arc welding has become the preferred welding process method for bottoming, filling and capping welding of N08825 process pipes due to the absence of slag, concentrated heat, and large penetration depth. The traditional N08825 manual argon tungsten arc welding group has a small gap or even no gap. The welding requires the welder to keep the arc length s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/167B23K9/235B23K9/028B23K101/06B23K103/08
CPCB23K9/0282B23K9/167B23K9/235B23K2101/06B23K2103/08
Inventor 陈杰恒
Owner 江苏利柏特股份有限公司
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