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Welding method of titanium welded tube for petrochemical engineering

A welding method and technology of titanium welded pipes, applied in welding equipment, welding accessories, welding/welding/cutting items, etc., can solve problems such as long manufacturing cycle, titanium rebound, and difficulty in pipe penetration

Inactive Publication Date: 2013-03-13
LUOYANG SUNRUI TI PRECISION CASTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many manufacturing processes for seamless pipes, the manufacturing cycle is long, and there are problems of uneven wall thickness and pipe diameter, which make it difficult to wear pipes. We are committed to replacing seamless pipes with welded pipes
However, due to the small diameter and large wall thickness of titanium welded pipes with this thickness and pipe diameter, the rebound phenomenon of titanium itself is serious, and there are problems of difficult welding and welding and impermeability. These problems have become the current production of this kind of pipe Technical Difficulties of Small Diameter and Super Thickness Titanium Welded Pipe

Method used

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  • Welding method of titanium welded tube for petrochemical engineering
  • Welding method of titanium welded tube for petrochemical engineering

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The raw material is TA2 titanium strip, the width is 60.0~60.5, and the wall thickness is 1.25mm. It is continuously cold-formed by using a Φ19-sized roll mold to prepare a Φ19×1.25mm-sized straight seam titanium welded pipe. The narrow titanium strip is formed by continuous cold bending, tungsten argon arc welding, welding process parameters: welding speed 0.5~1m / min, welding current 110~125A, welding voltage 8.8~98V, argon gas flow 10~25l / min, welding The opening of the squeeze roller is 1.7mm, and the inclination angle between the welding torch and the workpiece is 30°, so that the weld seam is fully filled and the transition is smooth. After welding, the eddy current non-destructive flaw detection device is used to monitor the quality of the weld, alarm if there is a defect, and cut off the alarm part. After welding, the pipe is subjected to sizing straightening and on-line induction annealing heat treatment. Online induction annealing to remove the stress remainin...

Embodiment 2

[0027] The raw material is TA2 titanium strip, the width is 79.3~79.6, and the wall thickness is 1.25mm. It is continuously cold-formed by using a Φ25-sized roll mold to prepare a Φ25×1.25mm-sized straight seam titanium welded pipe. The narrow titanium strip is formed by continuous cold bending and argon tungsten arc welding, using welding process parameters: welding speed 0.5~1m / min, welding current 120~135A, welding voltage 8.8~9.4V, argon flow 10~25 l / min , The opening of the welding squeeze roller is 2.0mm, and the inclination angle between the welding torch and the workpiece is 35°, so that the weld seam is fully filled and the transition is smooth. After welding, the eddy current non-destructive flaw detection device is used to monitor the quality of the weld, alarm if there is a defect, and cut off the alarm part. After welding, the pipe is subjected to sizing straightening and on-line induction annealing heat treatment. On-line induction annealing to remove the stress...

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Abstract

The invention introduces a welding method of a titanium welded tube for petrochemical engineering. A titanium belt is subjected to on-line continuous cold roll forming to form closed bore diameter and then fed into a welding case body, a single gun is adopted for argon tungsten-arc welding, argon tungsten-arc welding is carried out by adopting appropriate welding parameters such as welding inclination angle, welding current and voltage, so as to weld the molded titanium belt into a straight-seam titanium welded tube; and during the welding process, argon gas is used for carrying out internal and external protection on the welded tube, protecting the single gun and protecting a welding support cover, so that the titanium welded tube for petrochemical engineering is prepared. The welding quality, surface quality and the like of the straight-seam titanium welded tube produced by the method can meet the requirements of titanium welded tubes for petrochemical engineering such as PTA (Pure Terephthalic Acid) engineering, the titanium welded tube can be used for replacing seamless titanium tubes for the petrochemical engineering industry, and the welding difficulty of the titanium welded tube with small tube diameter and super thick wall can be solved; and compared with a seamless titanium welded tube preparation method, the method provided by the invention has the advantages of less working procedures, simplicity in operation and easiness for realization of large-batch production.

Description

[0001] technical field [0002] The invention relates to a technique in the field of material processing, in particular to a welding method for a petrochemical titanium welded pipe. Background technique [0003] Titanium has excellent properties such as small specific gravity, high specific strength and corrosion resistance. Titanium and titanium processed materials are widely used in the petrochemical industry, of which titanium pipes account for a large proportion. In the petrochemical PTA industry (purified terephthalic acid), the parts that require anti-corrosion equipment are reactors and heat exchangers, and the main raw materials in reactors and heat exchangers are titanium pipes. [0004] At present, the titanium tubes used before the petrochemical PTA industry are generally seamless titanium tubes, the thickness is generally 1.0~2.0mm, and the diameter is generally Φ16~Φ32mm. There are many manufacturing processes for seamless pipes, the manufacturing cycle is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/167B23K9/08B23K9/32B23K101/06B23K103/14
Inventor 贾祥亚马虹剑张东东
Owner LUOYANG SUNRUI TI PRECISION CASTING
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