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Girth welding method of duplex stainless steel bimetal composite pipe

A bimetallic composite pipe, duplex stainless steel technology, applied in welding equipment, metal processing equipment, welding/welding/cutting items, etc. The effect of high performance, high welding qualification rate and balanced welding seam

Inactive Publication Date: 2009-02-11
XIAN SUNWARD AEROSPACE MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the above welding method needs to use a variety of different welding processes and welding materials in the welding process, the process is complicated, and defects such as pores, slag inclusions and cracks are prone to occur.

Method used

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  • Girth welding method of duplex stainless steel bimetal composite pipe
  • Girth welding method of duplex stainless steel bimetal composite pipe

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Embodiment Construction

[0024] The girth welding welding method of duplex stainless steel bimetal composite pipe of the present invention comprises the following steps:

[0025] The first step, groove treatment: such as figure 1 As shown, the duplex stainless steel bimetallic composite pipe is composed of a duplex stainless steel lining pipe 2 with a wall thickness of 0.6-2 mm and a carbon steel base pipe 1 set outside the inner lining pipe 2; first, the base pipe 1 is welded The surface is machined with a V-shaped groove, the angle α of the groove is 45-55°, and the length of the liner 2 protruding from the base pipe 1, that is, the blunt edge 6, is 2-3 mm. In this embodiment, the base pipe 1 is 20 steel and its wall thickness is 7 mm. In practice, the base pipe 1 can also be 20G steel, L245NB pipeline steel or L360 pipeline steel, etc.; the material of the lining pipe 2 is 2205 duplex stainless steel And its wall thickness is 2mm. Firstly, the welding surface of the base pipe 1 is processed into ...

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Abstract

The invention discloses a method for girth welding for double-phase stainless steel bimetal composite tubes. The method comprises the following steps of: firstly, groove processing: the double-phase stainless steel bimetal composite tube consists of a double-phase stainless steel lining tube and a carbon steel base tube, the welding surface of the base tube is processed into a V-shaped groove at an angle of 45-55 degree, and the lining tube is 2-3 mm longer than the base tube; secondly, caulk welding: the connection ports between the base tube and the lining tube are welded through argon tungsten-arc welding, double-phase stainless steel welding wires are adopted, and the welding current is 65-80 A; thirdly, backing welding: the connection ports of lining tube are welded through argon tungsten-arc welding, double-phase stainless steel welding wires are adopted, and the welding current is 60-90 A; fourthly, base tube welding: the connection ports of the base tube are welded through arc welding, and double-phase stainless steel welding wires are adopted. The procedures and the steps are simple, the used welding material is in a small amount, the welding qualification rate is high, the welding defect can be reduced or avoided, and the production efficiency can be greatly improved.

Description

technical field [0001] The invention relates to a welding method for bimetallic composite pipes, in particular to a method for girth welding of duplex stainless steel bimetallic composite pipes. Background technique [0002] In recent years, with the increasing application of bimetallic composite pipes, a variety of different types of welding methods for composite pipes have emerged. After searching, no welding method about duplex stainless steel composite pipe has been found. At present, most of the welding methods commonly used in bimetallic composite pipes divide the welding process into four parts: sealing weld, lining bottom weld, transition weld and base pipe weld. First, argon arc welding is used for sealing welding. , and then carry out argon arc welding stainless steel lining bottom welding to ensure the content of Cr and Ni in the chemical composition of the lining layer, so as to ensure the corrosion resistance of the corrosion resistance layer; then use stainles...

Claims

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Application Information

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IPC IPC(8): B23K9/16B23K9/235B23K9/095B23K101/06B23K103/16
Inventor 张立君张燕飞郭崇晓
Owner XIAN SUNWARD AEROSPACE MATERIAL
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