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Automatic tube butt joint all-position TIG welding technology for coiled tubing

A coiled tube, all-position technology, applied in manufacturing tools, welding equipment, metal processing, etc., can solve the problems of low welding efficiency, high requirements for welders' operation skills, and high labor intensity of welders, so as to improve work efficiency and excellent comprehensive performance , The effect of reducing the influence of human factors

Inactive Publication Date: 2015-07-01
XI'AN PETROLEUM UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the current butt welding method of coiled tubing at home and abroad is mainly manual TIG (tungsten argon arc welding) welding. This butt welding process has low welding efficiency, high labor intensity for welders, and high requirements for welders' operation skills. Development of welding processes with increasing automation

Method used

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  • Automatic tube butt joint all-position TIG welding technology for coiled tubing
  • Automatic tube butt joint all-position TIG welding technology for coiled tubing
  • Automatic tube butt joint all-position TIG welding technology for coiled tubing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] The dimensions and grades of the coiled tubing applicable to this embodiment are pipe diameter 31.75mm (1.25′), wall thickness 3.18mm, QT800 ultra-fine grain steel coiled tubing, yield strength σs≥552Mpa, tensile strength σb≥621MPa , using all-position automatic TIG welding.

[0057] According to the method of the present invention, a V-shaped groove is opened, the angle of groove processing is 75°, the blunt edge is 0.7mm, and there is no gap for pairing.

[0058] Table 1 Process parameters of QT800 coiled tubing

[0059]

[0060] The welded joint performance of embodiment is as follows:

[0061] Stretching test:

[0062] Tensile test results (gauge length 50mm)

[0063] sample

σ b (MPa)

δ(%)

broken state

[0064] Coiled tubing base material

605.5

19

base material

Welded joint sample

627

16.7

fracture in heat affected zone

[0065] Bending test: The bending test of the welded joint ad...

Embodiment 2

[0068] The dimensions and grades of the coiled tubing applicable to this embodiment are pipe 50.8mm (2′), wall thickness 5.18mm, QT900 ultra-fine grain steel coiled tubing, yield strength σs≥630Mpa, tensile strength σb≥715MPa, All-position automatic TIG welding is adopted.

[0069] According to the method of the present invention, a U-shaped bevel is opened, the groove processing slope angle is 25° ± 2°, the blunt edge length is 3mm, the blunt edge thickness is 1.6mm, the radius of the transition arc is 1mm, the pair gap is 0.5mm, and the welding wire model specification : ER70S-6, φ1.0mm, see Table 2 for welding specification parameters.

[0070] Table 2 QT900 coiled tubing process parameters

[0071]

[0072] Appearance inspection of QT900 grade coiled pipe welds after welding in this example shows that the surface is well formed and has no welding defects; according to GB / T5097-2005 inspection standards, the welded joints are subjected to non-destructive inspection by p...

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Abstract

The invention provides an automatic tube butt joint all-position TIG welding technology for coiled tubing. The technology comprises the steps that the tube ends at the two sides of the coiled tubing are straightened, the tube ends of the two sides are subjected to V-shaped edge preparation or U-shaped edge preparation, the inner wall and the outer wall of a joint between the tube ends are cleaned, then the tube ends are assembled in a butt joint mode, a butt joint of the coiled tubing is subjected to non-wire-filling backing weld, filling weld and cosmetic weld through the automatic all-position TIG welding technology, when the butt joint is welded, the arc starting position of a welding gun is located at 1:30 or 2:00, and a separated section welding technology method is adopted for welding. By means of the welding technology, aiming at the tube butt joint welding of the coiled tubing, the traditional manual TIG welding is transferred into full-automatic TIG welding, the working efficiency is improved, the labor intensity is lowered, and the welding joint of the coiled tubing of great comprehensive performances is obtained.

Description

technical field [0001] The invention belongs to the field of welding technology, and in particular relates to an all-position automatic TIG welding process for pipe butt joint of continuous pipe. Background technique [0002] Coiled tubing (CT for short, also known as coiled tubing, flexible tubing, serpentine tubing or coiled tubing) is the basis and important part of coiled tubing technology. A thousand-meter pipe without joints, mainly made of steel, coiled on a large-diameter (generally about 1m or more) reel. In recent years, with the development of the petroleum industry, the coiled tubing operation technology composed of coiled tubing and its working machine has become more and more prominent in the fields of oil exploration, drilling, well washing, and oil transportation. Due to its wide application range, Easy to use, etc., known as "universal operation equipment". [0003] During the operation and construction, the coiled tubing coiled on the reel is sent downhol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/167B23K9/235
CPCB23K9/167B23K9/235B23K2101/06
Inventor 王洪铎石凯李霄周勇徐学利刘彦明
Owner XI'AN PETROLEUM UNIVERSITY
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