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A fully automatic butt welding process for bimetal composite pipe

A bimetallic composite pipe, fully automatic technology, applied in metal processing, metal processing equipment, welding medium and other directions, can solve the problems of low one-time welding pass rate, high construction time cost, high labor intensity of welders, etc., to ensure consistent forming and reliable quality, improve welding efficiency and pass rate, and improve the effect of welding efficiency

Active Publication Date: 2015-08-05
XIAN SUNWARD AEROSPACE MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, manual bottom welding, over welding, semi-automatic filling welding and cover welding are mainly used. This butt welding process has disadvantages such as low welding efficiency, high labor intensity of welders, and low welding pass rate during long-term welding. Deep-sea pipelines have high construction time and high requirements for pass rate. Using existing technology will prolong the construction period and increase costs

Method used

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  • A fully automatic butt welding process for bimetal composite pipe
  • A fully automatic butt welding process for bimetal composite pipe
  • A fully automatic butt welding process for bimetal composite pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Taking Φ168.3mm×(14.2mm base layer + 2mm corrosion-resistant layer) bimetallic composite pipe as an example, the base material is L415QB, the lining material is 316L, and the corrosion-resistant layer at the end of the bimetallic composite pipe is in the form of surfacing welding and For the 625 alloy combined with basic metallurgy, the butt welding method is:

[0033] Step 1, such as figure 1 As shown, a J-shaped groove is machined at the ends of the two bimetal composite pipes to be welded; the length of the blunt edge of the J-shaped groove is 1.5 mm, the thickness of the blunt edge is 1.8 mm, and the groove angle is 6 °, a smooth transition between the groove and the blunt edge, the radius of the transition arc is 4.6mm;

[0034] Step 2. Butt-fitting the grooves of the two bimetal composite pipes machined in step 1, the gap of the butt-fitting is 0.3mm, and the widest part of the weld bead after the butt-fitting is 15mm;

[0035] Step 3. Preheat the bimetallic com...

Embodiment 2

[0041] Taking Φ273mm×(14.2mm base layer + 2mm corrosion-resistant layer) bimetallic composite pipe as an example, the base material is L360QB, the lining material is 316L, and the corrosion-resistant layer at the end of the bimetallic composite pipe is in the form of surfacing welding and base metallurgy. Combined 625 alloy, the butt welding method is:

[0042] Step 1, such as figure 1 As shown, a J-shaped groove is machined on the pipe ends to be welded of two bimetal composite pipes; the length of the blunt edge of the J-shaped groove is 1.6mm, the thickness of the blunt edge is 1.7mm, and the groove angle is 6.5 °, a smooth transition between the groove and the blunt edge, the radius of the transition arc is 3mm;

[0043] Step 2, butt fitting the grooves of the two bimetal composite pipes machined in step 1, the gap of the butt fitting assembly is 0.14mm, and the widest part of the weld bead after the butt fitting assembly is 12mm;

[0044] Step 3. Preheat the bimetallic ...

Embodiment 3

[0050] Take the Φ168.3mm×(12.7mm base layer + 3mm corrosion-resistant layer) bimetallic composite pipe as an example, in which the base material is X65, the lining material is 316L, and the corrosion-resistant layer at the end of the bimetallic composite pipe is in the form of surfacing welding and For the 625 alloy combined with basic metallurgy, the butt welding method is:

[0051] Step 1, such as figure 1 As shown, a J-shaped groove is machined at the ends of the two bimetallic composite pipes to be welded; the length of the blunt edge of the J-shaped groove is 1.4mm, the thickness of the blunt edge is 2.0mm, and the groove angle is 3 °, a smooth transition between the groove and the blunt edge, the radius of the transition arc is 5mm;

[0052] Step 2. Butt-fitting the grooves of the two bimetallic composite pipes machined in step 1, the gap of the butt-fitting is 0.5mm, and the widest part of the weld bead after the butt-fitting is 14.2mm;

[0053] Step 3. Preheat the bi...

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Abstract

The invention discloses a full-automatic butt welding technology of bi-metal composite tubes. The process comprises the steps that J-type grooves are machined at pipe ends to be welded of the two bi-metal composite tubes respectively; the machined grooves of the two bi-metal composite tubes are assembled in a butt joint mode; the bi-metal composite tubes after the butt joint assembly are preheated, and then a full-automatic argon arc welding machine is adopted to carry out backing welding on the bi-metal composite tubes; the full-automatic argon arc welding machine is adopted to carry out hot passage welding on the bi-metal composite tubes after the backing welding; the full-automatic argon arc welding machine is adopted to carry out filling welding on the bi-metal composite tubes after the hot passage welding; the full-automatic argon arc welding machine is adopted to carry out cosmetic welding on the bi-metal composite tubes after the filling welding. The welding technology can achieve the full-automatic backing welding and hot passage welding on the bi-metal composite tubes, the welding technology is optimized, the welding efficiency is improved, and the backing welding and hot passage welding efficiency is improved by 4-5 times than that in the prior art.

Description

technical field [0001] The invention belongs to the field of welding technology, and in particular relates to a fully automatic butt welding process for bimetal composite pipes. Background technique [0002] At present, in oil and gas field development projects, because the oil and natural gas transported contain more corrosive media, ordinary carbon steel pipes cannot meet the anti-corrosion performance requirements. Ordinary carbon steel + corrosion inhibitors only slow down the corrosion rate of pipelines. High cannot be promoted on a large scale. In this context, bimetallic composite pipes have been rapidly promoted in oil and gas fields due to their structural characteristics, and have broad market prospects. However, due to their special structure, the welding process of composite pipes is essentially different from that of carbon steel pipes. At present, manual bottom welding, over welding, semi-automatic filling welding and cover welding are mainly used. This butt w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/167B23K35/30B23K9/095B23K9/235
CPCB23K9/0209B23K9/022B23K9/0282B23K9/16B23K33/006B23K35/3026B23K2101/06
Inventor 梁国栋梁国萍张燕飞郭霖
Owner XIAN SUNWARD AEROSPACE MATERIAL CO LTD