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Full-automatic root welding method for pipe end of bimetal composite pipe

A bimetallic composite pipe, fully automatic technology, applied in the direction of metal processing equipment, welding equipment, welding medium, etc., can solve the problems of difficult control of manual welding process, irregular appearance surface, easy to be burned by arc, etc., to improve labor efficiency Production efficiency, convenient construction, and the effect of improving welding efficiency

Active Publication Date: 2015-12-30
XIAN SUNWARD AEROSPACE MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1. The manual welding process is not easy to control. When the liner is a thin-walled alloy tube, it is easy to be burned through by the arc
[0004] 2. The quality of root welding is not high, and defects are prone to occur in the root welding part, and the appearance surface is irregular
[0005] 3. Manual root welding requires two layers of cladding, which is inefficient
[0006] 4. The welding wire used in manual root welding is ER309LMo, and the hardness of the welding heat-affected zone after root welding exceeds 345HV10, which is easy to cause cracking

Method used

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  • Full-automatic root welding method for pipe end of bimetal composite pipe
  • Full-automatic root welding method for pipe end of bimetal composite pipe
  • Full-automatic root welding method for pipe end of bimetal composite pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The bimetallic composite pipe to be welded is a composite pipe composed of a nickel-based alloy lining pipe 1 made of 825 nickel-based alloy and a carbon steel base pipe 2 made of L415QS carbon steel, and its specification is medium 217.8x (8+2.5)mm.

[0037] Step 1, first cut off the corrosion-resistant alloy liner 1 to a length of 25mm, and then process the outside of the exposed corrosion-resistant alloy liner 1 from outside to inside to form an inwardly inclined slope; the slope angle of the slope is 60°;

[0038] Step 2, under the protection of argon, use a fully automatic hot wire TIG welding machine to root weld from inside to outside on the inclined surface and form a single layer of nickel-based alloy root welding layer 3, the height of the inner wall of the nickel-based alloy root welding layer 3 is not low The height of the inner surface of the corrosion-resistant alloy lined pipe 1. The welding materials used are nickel-based alloy welding wire ERNiCrMo-3 / Φ...

Embodiment 2

[0040] The bimetallic composite pipe to be welded is a composite pipe composed of stainless steel lining pipe 1 made of 316L stainless steel and carbon steel base pipe 2 made of L360QS carbon steel, and its specification is medium 219.1x(10+2 )mm.

[0041] Step 1, first cut off the length of 60mm of the stainless steel lining pipe 1, and then process the outside of the exposed stainless steel lining pipe 1 from outside to inside to form an inwardly inclined slope; the slope angle of the slope is 75°;

[0042]Step 2, under the protection of argon, use a fully automatic hot wire TIG welding machine to root weld from inside to outside on the inclined surface and form a single layer of nickel-based alloy root welding layer 3, the height of the inner wall of the nickel-based alloy root welding layer 3 is not low The height of the inner surface of the stainless steel lined pipe 1. The welding materials used are nickel-based alloy welding wire ERNiCrMo-3 / Φ0.9; corrosion-resistant al...

Embodiment 3

[0044] The bimetal composite pipe to be welded is a composite pipe composed of a stainless steel lining pipe 1 made of 316L stainless steel and a carbon steel base pipe 2 made of L245N carbon steel, and its specification is medium 219.1x(11.1+3 ) mm.

[0045] Step 1, first cut off the corrosion-resistant alloy liner 1 to a length of 90 mm, and then process the outside of the exposed corrosion-resistant alloy liner 1 from outside to inside to form an inwardly inclined slope; the slope angle of the slope is 45°;

[0046] Step 2, under the protection of argon, use a fully automatic hot wire TIG welding machine to root weld from inside to outside on the inclined surface and form a single layer of nickel-based alloy root welding layer 3, the height of the inner wall of the nickel-based alloy root welding layer 3 is not low The height of the inner surface of the stainless steel lined pipe 1. The welding materials used are nickel-based alloy welding wire ERNiCrMo-3 / Φ0.9; corrosion-r...

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Abstract

The invention discloses a full-automatic root welding method for a pipe end of a bimetal composite pipe. The bimetal composite pipe subjected to root welding comprises an anti-corrosion alloy lining pipe and a carbon steel base pipe, wherein the outer side of the anti-corrosion alloy lining pipe is sleeved with the carbon steel base pipe. The method comprises the following steps: first, cutting off a 25-150 mm section of the anti-corrosion alloy lining pipe; then, processing the exposed outer side of the anti-corrosion alloy lining pipe from outside to inside into an inward slop; finally, under the protection of high-purity argon gas, performing automatic root welding on the slop from inside to outside by adopting an argon tungsten-arc welding machine, so as to form a single nickel base alloy root welding layer. According to the method, full-automatic root welding of the composite pipe can be realized through a welding process; the welding process adopts a single-pass forming mode, so as to overcome the defect that the welding efficiency is reduced due to a double-pass forming mode adopted by manual argon arc welding is overcome, and improve the welding efficiency.

Description

technical field [0001] The invention belongs to the technical field of pipe end treatment of bimetallic composite pipes, and in particular relates to a fully automatic root welding method for pipe ends of bimetallic composite pipes. Background technique [0002] In the existing composite pipe end treatment technology, most of the pipe end of the base pipe is cut off a section of the liner first, and then two manual root welding is performed at the junction of the liner groove and the inner side of the carbon steel layer, and then the root welding is performed after the root welding. Continue surfacing after the pass. In the actual application process, the disadvantages of the above-mentioned process are: [0003] 1. The manual welding process is not easy to control. When the liner is a thin-walled alloy tube, it is easy to be burned through by the arc. [0004] 2. The quality of root welding is not high, and defects are prone to occur in the root welding part, and the appe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/167B23K35/30
CPCB23K9/167B23K35/3033
Inventor 王富铎梁国萍王剑薛培婧韩立峰徐超凡边天军徐驰
Owner XIAN SUNWARD AEROSPACE MATERIAL CO LTD
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