Argon tungsten-arc repair welding method based on activated flux

A technology of argon tungsten arc welding and active flux, which is applied in arc welding equipment, welding equipment, manufacturing tools, etc., can solve the problems of high labor intensity, low repair welding efficiency, large workpiece deformation, etc., and achieves simple and convenient operation. The effect of small repair welding deformation and improving arc energy density

Inactive Publication Date: 2012-10-10
XIAN AEROSPACEMOTOR MACHINE FACTORY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the high labor intensity, low repair welding efficiency and large workpiece deformation after repair welding in the prior art, it is not suitable for thin-wall and medium-wall thickness stainless steel, high-strengt

Method used

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  • Argon tungsten-arc repair welding method based on activated flux
  • Argon tungsten-arc repair welding method based on activated flux

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Effect test

Embodiment 1

[0016] This embodiment is an active flux-based repair welding method for a low-alloy high-strength steel pressure vessel by argon tungsten arc welding.

[0017] In this embodiment, the workpiece to be repaired is a low-alloy high-strength steel pressure vessel with a diameter of φ1200 mm, a wall thickness of 3.2 mm, and a material of 30CrMnSiA high-strength steel with a material strength level of 1000 MPa. After argon tungsten arc welding was adopted, many cracks were found in the girth weld by X-ray inspection. The active flux used is low-carbon steel argon tungsten arc welding active flux produced by Xi'an Aerospace Power Machinery Factory, and the gas hole defects in the weld seam of the low-alloy high-strength steel pressure vessel are repaired by argon tungsten arc welding , the specific repair welding steps are:

[0018] Step 1, perform appearance treatment on the weld seam. The conventional method is used to clean the defect parts in the weld seam of low-alloy high-st...

Embodiment 2

[0023] This embodiment is an active flux-based repair welding method for a low-alloy high-strength steel pressure vessel by argon tungsten arc welding.

[0024] In this embodiment, the workpiece to be repaired is a low-alloy high-strength steel pressure vessel with a diameter of φ1400 mm, a wall thickness of 4.5 mm, and a material of 30CrMnSiA high-strength steel with a material strength level of 1000 MPa. After argon tungsten arc welding was adopted, X-ray flaw detection found that there were clusters of air hole defects with a diameter of about φ1.0mm scattered in the girth weld in a length of about 500mm. The active flux used is low-carbon steel argon tungsten arc welding active flux produced by Xi'an Aerospace Power Machinery Factory, and the gas hole defects in the weld seam of the low-alloy high-strength steel pressure vessel are repaired by argon tungsten arc welding , the specific repair welding steps are:

[0025] Step 1, perform appearance treatment on the weld seam...

Embodiment 3

[0030] This embodiment is an active flux-based repair welding method for a low-alloy ultra-high-strength steel pressure vessel by argon tungsten arc welding.

[0031] In this embodiment, the workpiece to be repaired is a low-alloy ultra-high-strength steel pressure vessel with a diameter of φ2000mm and a wall thickness of 6.5mm. The material is 31Si2MnCrMoVE ultra-high-strength steel, and the material strength level is 1700MPa. After adopting automatic argon tungsten arc welding, X-ray flaw detection found that there were many incomplete penetration at the root of the girth weld. Due to the limitation of the product structure, root cleaning and repair welding cannot be performed directly from the back of the weld. Manual argon tungsten arc welding based on active flux is used to repair the above-mentioned incomplete penetration defect at the root of the weld from the front of the weld. The active flux used is low-carbon steel argon tungsten arc welding active flux produced by ...

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Abstract

The invention discloses an argon tungsten-arc repair welding method based on activated flux. The argon tungsten-arc repair welding method based on activated flux is suitable for low-alloy high-strength steel, low-alloy ultra-high-strength steel and stainless steel. The argon-arc welding activated flux of a low-carbon steel tungsten electrode is mixed into paste with acetone, and is coated at the part of a workpiece, which is to be repair-welded; argon tungsten-arc welding is adopted to carry out the repair welding treatment at the part of the workpiece, which is to be repair-welded and is coated with the activated flux; and when the workpiece is made by high-strength steel or ultra-high-strength steel, stress removal annealing treatment is carried on the whole repair-welded workpiece. The activated flux which is adopted during the repair welding process of the technology can improve the arc energy density; compared with the traditional repair welding technology, the method has the advantages that the weld heat input amount is reduced by about 50%, the repair welding deformation is reduced by about 40%, and the repair welding efficiency is improved to about 100%; the repair welding technological process with high efficiency, high performance and low deformation can be realized; and the method has the characteristics of simplicity and convenience in operation.

Description

technical field [0001] The invention relates to a tungsten argon arc welding repair welding process using active flux, which is a high-quality and high-efficiency weld seam repair welding technology. Background technique [0002] It is difficult to completely avoid all kinds of welding defects in the welding process of metal materials, and there is a defect repair welding problem for welds with high quality requirements. The traditional repair welding method is "repair the defect first, then fill the wire repair welding", that is: X-ray flaw detection to determine the defect location → use grinding wheels and other tools to grind the weld defect → clean the place to be welded after grinding → fill the defect grinding pit Repair welding of welding consumables → stress relief annealing treatment if necessary → X-ray inspection to confirm that the defects have been eliminated. Since it is necessary to use tools such as grinding wheels to completely remove the defects in the we...

Claims

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Application Information

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IPC IPC(8): B23K9/167B23K9/235B23K9/022
Inventor 王卫玲吴军张立武胡春海吴岩杨平会万志平贺永海
Owner XIAN AEROSPACEMOTOR MACHINE FACTORY
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