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Pipe-pipe site butt welding method of continuous pipes

A coiled tube and butt welding technology, which is applied in welding equipment, welding accessories, arc welding equipment, etc., can solve the problems that the stability of welded joint quality depends on the welder's operating skill level, the thermal process cannot be controlled, and the required power is large. , to achieve the effects of reducing the tempering softening zone, slowing down the growth of grains, and improving the welding fusion ratio

Inactive Publication Date: 2012-01-25
XI'AN PETROLEUM UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The manual arc welding method is a very common and easy-to-use welding method. The disadvantage is that the stability of the welded joint quality depends on the welder's operational skill level
[0013] Resistance butt welding is a method of welding by using the resistance heat generated by the current passing through the contact surface of the joint and the adjacent area and applying pressure after the weldment is assembled, which is called resistance butt welding, but the equipment is large, the required power is large, and there are internal burrs, Uncontrollable thermal process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The dimensions and grades of coiled tubing applicable to this embodiment are pipe diameter 31.75mm (1.1 / 4′), wall thickness 3.404mm, A606-4 type HSLA steel coiled tubing, yield strength σ s ≥480Mpa, tensile strength σ b ≥550MPa. TIG manual welding is adopted. This embodiment includes the following steps:

[0028] 1. Straighten the two bent coiled pipes by cold calibration, and select a mechanical straightening device. During the straightening process, the pipe body must not be damaged, and hard bends, indentations, steps, and scratches must not occur. They will be ready for welding The two pipe ends are completely straightened, and the straightening section of each pipe end is 400mm in length, so as to ensure that the pipe-to-pipe butt joint is clamped, and then the continuous pipe from the pipe end to the coiled reel is selectively adjusted. Bend straightening so that the two pipe ends of the fully straightened section touch, the axes coincide and lie on a straight ...

Embodiment 2

[0041] The dimensions and grades of coiled tubing applicable to this embodiment are pipe diameter Φ38.1mm (1.1 / 2′), wall thickness 3.1mm, coiled tubing made of QT700 ultra-fine grain steel, and yield strength σ s =510MPa, tensile strength σ b =625 MPa. All-position TIG automatic welding is adopted. This embodiment includes the following steps:

[0042] 1. Straighten the two bent coiled pipes by cold calibration method, and use a hydraulic straightening device. During the straightening process, the pipe body must not be damaged, and hard bends, indentations, steps, and scratches must not occur. They will be ready for welding The two pipe ends are completely straightened, and the straightening section of each pipe end has a length of 500mm, so as to ensure the docking of the pipe-pipe butt joint, and then the continuous pipe from the pipe end to the coiled drum is selectively and moderately bent Straighten so that the two pipe ends of the fully straightened section touch, the...

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Abstract

The invention relates to a pipe-pipe site butt welding method of continuous pipes. The pipe-pipe site butt welding method comprises the following steps: firstly adopting a cold straightening method to straighten the continuous pipes, then adopting a cold rounding method to carry out rounding, secondly carrying out groove processing with same angles on the butted positions of the pipe ends, then adopting an outer aligning mode to process the two continuous pipes into pipe ends with grooves so as to carry out welding and aligning assembly, and then adopting full-position non-melt electrode argon arc (TIG) automatic welding or manual welding; and finally carrying out electric arc burn-back heat treatment. The pipe-pipe site butt welding method can finish pipe-pipe site butt welding of the continuous pipes in situ, and obtain welding joints with the structure size of being consistent to that of the continuous pipes and comprehensive mechanical property of being near to that of a main body.

Description

technical field [0001] The invention relates to a welding process, in particular to a pipe-pipe on-site butt welding method for continuous pipes. Background technique [0002] Coiled Tubing (CT for short, also known as coiled tubing, flexible tubing, serpentine tubing or coiled tubing) refers to the use of metal materials, mainly steel, which can be coiled on a large diameter (generally about 1m or more) On the reel, a pipe with a length of several hundred meters to several thousand meters without joints. 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, It is easy to use and is known as "universal operation equipment". Some experts pointed out that the proportion of coiled tubing used in oil and gas production reflects t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/167B23K9/235B23K9/32B23K33/00C21D9/50
Inventor 石凯周勇彭涛刘彦明李霄王洪铎张啊妮张燕娜
Owner XI'AN PETROLEUM UNIVERSITY
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