Continuous oil pipe steel strip butting technique

A steel strip and process technology, applied in the field of coiled tubing steel strip butt joint process, can solve the problems of wide welding heat affected area, many welding passes, unsuitable production, etc. The effect of weld structure

Inactive Publication Date: 2010-09-15
BAOJI PETROLEUM STEEL PIPE
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It was not until 1987 that according to the process characteristics of ERW welded steel pipes, the 45°TIG oblique welding process was first used for steel strip butt jointing

Method used

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  • Continuous oil pipe steel strip butting technique
  • Continuous oil pipe steel strip butting technique

Examples

Experimental program
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Example Embodiment

[0026] Attached figure 1 Describe an embodiment of the present invention (steel strip specification 3.18×120.2 mm).

[0027] 1. Cut the butt ends of the steel belt I and the steel belt II into 45° end faces and then polish and remove rust;

[0028] 2. Grind and remove the rust from the tangent end faces of the arc ignition and extinguishing plate I, the arc ignition and extinguishing plate II and the steel belt I and the steel belt II;

[0029] 3. Align and compress the butt ends of the steel strip I and steel strip II, and use manual TIG welding to spot weld the butt ends of the steel strip I and steel strip II to form a butt seam;

[0030] 4. Place the ignition and extinguishing arc plate I and the ignition and extinguishing arc plate II at the beginning and end of the butt joint formed by spot welding of the steel strip I and the steel belt II, and make the ignition and extinguishing arc plate I and the ignition and extinguishing arc plate II be polished and removed. The rust end ...

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Abstract

The invention relates to a continuous oil pipe steel strip butting technique. The technique comprises the following steps: respectively cutting butt ends of two steel strips into a 45-degree end face, and polishing to remove rust; polishing end faces on two tab plates tangent to the steel strips to remove rust; aligning and compacting the butt ends of the steel strips, and spot-welding the butt ends of the steel strips by manual TIG welding to form a butt joint; respectively putting the tab plates on the head and tail of the butt joint of the steel strips, abutting the polished end faces of the tab plates against the two sides of the steel strips, and spot-welding the polished end faces of the tab plates by manual TIG welding for being fixed on the head and tail of the butt joint of the steel strips; carrying out backing welding by using a PLASMA welding technique; carrying out cosmetic welding by using the TIG welding technique; carrying out thermomechanical treatment on the butt joint; and removing the tab plates on the two sides of the welding seam. The invention combines the TIG welding technique with the PLASMA wire-filling welding technique, so that the welding seam has favorable toughness and plasticity. The invention enhances the fatigue strength of the continuous pipes, and prolongs the service life of the continuous pipes. The continuous oil pipe product has the advantages of stable performance and good quality.

Description

technical field [0001] The invention relates to a butt jointing process of coiled tubing steel strips. Background technique [0002] The steel strip butt joint and steel plate butt joint in the prior art include submerged arc welding, CO 2 Gas shielded welding, Ar 2 +CO 2 Mixed gas shielded welding, TIG welding, PLASMA welding and other butt joint processes. For the vast majority of steel pipe production, they are supplied according to the specified length. Reasonable control of the production process can save the joints at the end of the pipe or the end of the pipe for cutting. However, for the production of coiled tubing (COILED TUBING), the length of a single steel pipe is often 3000-5000m, or even more than 10,000 meters. Therefore, the quality of steel belt butt joint directly determines whether qualified coiled tubing products can be produced. Since the diameter of the coiled tubing is generally Φ19.1-114.3mm, it is generally produced by ERW (high-frequency straig...

Claims

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Application Information

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IPC IPC(8): B23K28/02
CPCB21C47/247
Inventor 杨忠文毕宗岳温宏伟李红智张万鹏谈树美余晗张锦刚张旭科刘换军李博峰锁伟苏建科张晓锋介升旗张鹏
Owner BAOJI PETROLEUM STEEL PIPE
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