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Welding method for butt joint of T2 red copper and S32168 stainless steel pipes

A stainless steel tube and welding method technology, applied in welding equipment, auxiliary devices, manufacturing tools, etc., can solve the problems of reduced mechanical properties of welded joints, large differences in physical properties, and high welding difficulty, and achieve efficient connection, moderate melting point, and guaranteed resistance. Effects of Corrosive Properties

Inactive Publication Date: 2021-01-05
HEFEI GENERAL MACHINERY RES INST +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

T2 copper has high price and low strength, while S32168 austenitic stainless steel has higher strength and economy; the physical properties of the two are quite different, welding is difficult, and many welding defects are prone to occur, such as welding hot cracks, penetration cracks, and welding defects. The mechanical properties of the joints are reduced, which often makes the welded joints of the two become the weak link in the welded structure.

Method used

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  • Welding method for butt joint of T2 red copper and S32168 stainless steel pipes
  • Welding method for butt joint of T2 red copper and S32168 stainless steel pipes
  • Welding method for butt joint of T2 red copper and S32168 stainless steel pipes

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Embodiment Construction

[0043] For ease of understanding, the specific working method of the present invention is further described as follows here:

[0044] In the welding method of the present invention, T2 copper tubes and S32168 stainless steel tubes can be selected for specific welding. in:

[0045] The chemical composition of the T2 copper tube base material is: 99.9% Cu+Ag, Fe, S, and Pb are not more than 0.005%; the melting point of the T2 copper tube is 1065-1082.5°C, and the thermal conductivity is 380λ / w·(m· k) -1 , the coefficient of linear expansion is 16.92α / 10 -6 k -1 .

[0046]The chemical composition of the base material of S32168 stainless steel pipe is: C content is 0.08%, Cr content is 17-19%, Ni content is 9-12%, Ti content is ≥5C-0.70%; melting point is 1398-1427°C, thermal conductivity 16.1λ / w·(m·k) -1 , the coefficient of linear expansion is 16.0α / 10 -6 k -1 .

[0047] The welding method is to expand the T2 copper tube first, then assemble it with the S32168 stainless...

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Abstract

The invention relates to the technical field of fusion welding of dissimilar materials, in particular to a welding method for butt joint of T2 red copper and S32168 stainless steel pipes. The method comprises the following steps: (1) carrying out pretreatment; (2) carrying out flaring and butting to form a welding joint; (3) preheating the welding joint; and (4) uniformly heating the welding jointto a brazing temperature, and adding brazing filler metal containing Ag, Cu, Ni and Li until a brazing seam is filled to form a welding seam. The method has the advantages of being high in operationreliability and high in welding yield, and the purpose of high-quality and efficient connection between the T2 red copper pipe and the S32168 stainless steel pipe can be realized easily, convenientlyand rapidly.

Description

technical field [0001] The invention relates to the technical field of fusion welding of dissimilar materials, in particular to a welding method for butt jointing of T2 red copper and S32168 stainless steel pipes. Background technique [0002] Copper and copper alloys are widely used in electrical, chemical, machinery manufacturing and other industries due to their excellent properties. At the same time, the demand for high-quality and efficient welding technology is becoming stronger; the welding between copper and steel dissimilar metals is the most One of the common welding needs. Due to the excellent thermal conductivity of copper and the huge difference in physical and chemical properties from steel, conventional welding methods are difficult to achieve good welding results. For example, T2 red copper is a metal material with high thermal conductivity and excellent seawater corrosion resistance, which is widely used in seawater cooling, desalination and military indust...

Claims

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Application Information

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IPC IPC(8): B23K1/00B23K1/19B23K1/20B23K3/08
CPCB23K1/0008B23K3/08B23K1/19B23K1/20
Inventor 徐鹏程叶醒龙杜珊珊李在鹏马晓光王勇王晓峰汪越李志岭骆念东
Owner HEFEI GENERAL MACHINERY RES INST
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