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Bimetal composite pipe end sealing weld technology based on R-shaped groove

A bimetallic composite pipe and groove technology, which is applied in metal processing, metal processing equipment, manufacturing tools, etc., can solve the problems of poor welding seam quality and easy quality defects of bimetallic composite pipes, so as to facilitate construction and labor production. The effect of improving efficiency and reducing the difficulty of sealing and welding

Active Publication Date: 2014-03-05
XIAN SUNWARD AEROSPACE MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a bimetallic composite pipe end sealing welding process based on R-shaped grooves in view of the above-mentioned deficiencies in the prior art, the sealing welding process steps are simple, the sealing welding process is easy to control and The welding quality is good, which can effectively solve the problems of poor weld seam quality existing in the existing composite pipe end sealing welding method, and the welded bimetallic composite pipe is prone to quality defects, etc.

Method used

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  • Bimetal composite pipe end sealing weld technology based on R-shaped groove

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Embodiment 2

[0066] In this embodiment, the difference from Embodiment 1 is that the specification of the bimetal composite pipe to be sealed and welded is Φ114×(10+3) mm, and the material of the carbon steel base pipe 2 of the bimetal composite pipe to be sealed and welded is L360NS carbon steel and its wall thickness is 10mm, the material of the stainless steel lining pipe 1 of the bimetal composite pipe to be sealed and welded is 825 stainless steel and its wall thickness is 3mm, and the arc radius R2 of the arc section=2.5mm , the arc radius R1=3.5mm of the arc-shaped transition section, the height of the arc section is 4mm, α=30°; when root welding is performed in step 2, the welding current is 85A and the welding voltage is 16V When carrying out cover welding in step 3, welding current is 110A and welding voltage is 17V; When carrying out bottom welding in step 2 and carrying out cover welding in step 3, the stainless steel welding wire that adopts is 625 welding wire, wherein The di...

Embodiment 3

[0070] In this embodiment, the difference from Embodiment 1 is that the specification of the bimetallic composite pipe to be sealed and welded is Φ76×(7+2) mm, and the material of the carbon steel base pipe 2 of the bimetallic composite pipe to be sealed and welded is 20G carbon steel and its wall thickness is 7mm, the material of the stainless steel lining pipe 1 of the bimetal composite pipe to be sealed and welded is 316L stainless steel and its wall thickness is 2mm, the arc radius R2 of the arc section=2mm, The arc radius R1=3mm of the arc-shaped transition section, the height of the arc section is 3mm, α=20°; when performing bottom welding in step 2, the welding current is 70A and the welding voltage is 15V; the step When the cover welding is performed in the third step, the welding current is 90A and the welding voltage is 15V; when the bottom welding is performed in the step 2 and the cover welding is performed in the step 3, the stainless steel welding wire used is the...

Embodiment 4

[0074]In this embodiment, the difference from Embodiment 1 is that the specification of the bimetallic composite pipe to be sealed and welded is Φ168×(12.7+3) mm, and the material of the carbon steel base pipe 2 of the bimetallic composite pipe to be sealed and welded is 20G carbon steel and its wall thickness is 12.7mm, the material of the stainless steel lining pipe 1 of the bimetallic composite pipe to be sealed and welded is 316L stainless steel and its wall thickness is 3mm, α=35 °; carry out back welding in step 2 , the welding current is 90A and the welding voltage is 22V; when the cover welding is performed in step 3, the welding current is 110A and the welding voltage is 22V; The stainless steel welding wires are all stainless steel welding wire HS316L; the stainless steel welding wire HS316L contains the following chemical composition: 0.024%C, 1.57%Mn, 0.65%Si, 0.001%S, 0.015%P, 18.37%Cr, 11.36% Ni and 2.10% Mo, the balance is iron; the diameter of the stainless ste...

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Abstract

The invention discloses a bimetal composite pipe end sealing weld technology based on an R-shaped groove. A sealing weld bimetal composite pipe is composed of a stainless steel lining pipe and a carbon steel base pipe. The technology comprises the first step of machining the R-shaped groove, namely, the R-shaped groove is formed in the carbon steel base pipe end of a bimetal composite pipe to be sealed and welded; the second step of carrying out backing weld, namely, the backing weld is carried out on the joint between a circular arc plane and the stainless steel lining pipe through an argon arc welding machine to form a backing weld layer which is located inside a circular arc section; the third step of carrying out cosmetic welding, namely, under the protection of inert gases, the cosmetic welding is carried out on the outer side of the backing weld layer through the argon arc welding machine to form a cosmetic welding layer, and the upper portion of the cosmetic welding layer is higher than the upper portion of a circular arc transmission section. The sealing weld technology steps are simple, the sealing weld technology process is controlled easily, the welding quality is good, and the problems that an existing bimetal composite pipe end sealing weld method is poor in welding quality, the welded bimetal composite pipe has the quality defect easily can be effectively solved.

Description

technical field [0001] The invention belongs to the technical field of bimetallic composite pipe welding, and in particular relates to a bimetallic composite pipe end sealing welding process based on an R-shaped groove. Background technique [0002] The bimetallic composite pipe combined based on the deflagration composite method mainly uses explosives to generate instantaneous shock waves, causing plastic deformation of the stainless steel lining pipe, and elastic deformation of the carbon steel base pipe, finally reaching the mechanical state of internal and external interference fit. Since deflagration cladding is a mechanical cladding method, there is a certain physical gap between the carbon steel base pipe and the stainless steel liner pipe, so the sealing welding of the pipe end becomes one of the important links in the quality control of the bimetal clad pipe end. The main function of sealing welding is: first, to prevent pollutants from entering the gap between the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/16B23K9/235
CPCB23K9/0282B23K9/164B23K9/167B23K9/235B23K2101/06
Inventor 梁国萍王斌姜义郭霖梁国栋王小艳
Owner XIAN SUNWARD AEROSPACE MATERIAL CO LTD
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