Welding method suitable for easy-to-oxidize alloy thin-walled tube

A welding method and technology for thin-walled pipes, applied in welding equipment, applications, metal processing, etc., can solve problems such as stress concentration, and achieve the effects of reducing stress concentration, increasing weld area, and improving welding quality and efficiency.

Pending Publication Date: 2021-08-17
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The invention aims to solve the technical problem that defects and stress concentration are likely to occur when thin-walled pipes are welded and connected, and provides a welding method suitable for easily oxidized alloy thin-walled pipes, which can reduce assembly difficulty, improve connection strength, and reduce joint stress Concentration, thereby improving welding quality and welding efficiency, and realizing efficient connection of easily oxidized alloy thin-walled pipes

Method used

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  • Welding method suitable for easy-to-oxidize alloy thin-walled tube
  • Welding method suitable for easy-to-oxidize alloy thin-walled tube
  • Welding method suitable for easy-to-oxidize alloy thin-walled tube

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Embodiment 1

[0055] In this embodiment, for the connection of two pipe sections with the same pipe diameter, only any one of the pipe sections is expanded in parallel, and after cleaning, circular seam self-fluxing welding is performed on the basis of assembly and connection.

[0056] Such as Figure 2-4 As shown, the pipe diameters of the first pipe section 1 and the second pipe section 3 are both 10 mm, and the wall thickness is 1 mm; the first pipe section 1 and the second pipe section 3 are butt welded, specifically according to the following steps:

[0057] Step 1: Perform a parallel flaring process on the 10mm-long connection end of the second pipe section 3 to form a parallel flaring portion 4, the inner diameter of which is 11mm.

[0058] Step 2: Use stainless steel silk to carefully polish the area within 20mm of the connecting end of the first pipe section 1, and the parallel flared part 4 of the second pipe section 3 and the area within 20mm near it, and then use alcohol or acet...

Embodiment 2

[0062] In this embodiment, for the connection of two pipe sections with similar pipe diameters, the flaring-shrinking process is used for cleaning, and then the circular seam is self-fluxing welded on the basis of the assembly connection.

[0063] Such as Figure 5-7 As shown, the pipe diameter of the third pipe section 5 is 8 mm, and the wall thickness is 1 mm; the pipe diameter of the fourth pipe section 9 is 10 mm, and the wall thickness is 1 mm. Butt welding the third pipe section 5 and the fourth pipe section 9 is carried out according to the following steps:

[0064] Step 1: Perform a tapered necking process with a taper of 5:1 on the 15 mm length section of the end of the third pipe section 5 with a pipe diameter of 10 mm to form a tapered necking part 6;

[0065] A taper flaring process with a taper of 5:1 is performed on the 15 mm length section at the end of the fourth pipe section 9 with a pipe diameter of 8 mm to form a taper flaring portion 8 .

[0066] Step 2: ...

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Abstract

The invention belongs to the technical field of easy-to-oxidize alloy material welding, and discloses a welding method suitable for an easy-to-oxidize alloy thin-walled tube. The welding method comprises the steps that when two tube sections with the same tube diameter are connected, a parallel flaring process is conducted on the connecting end of one tube section; when two tube sections with similar tube diameters are connected, the connecting end of the tube section with the larger tube diameter is subjected to a taper necking process, and the connecting end of the tube section with the smaller tube diameter is subjected to a taper flaring process; and the two tube sections are assembled and connected after being cleaned, and two circular seam autogenous welding is carried out between the connecting ends of the two tube sections by adopting argon arc welding, so that reliable connection is realized. According to the welding method, the assembly precision requirement and the welding difficulty can be lowered, the method is suitable for being used in field maintenance operation, and efficient connection of the easy-to-oxidize alloy thin-walled tube is achieved.

Description

technical field [0001] The invention belongs to the field of welding technology, and in particular relates to a welding method suitable for easily oxidized alloy materials such as titanium alloy, aluminum alloy and stainless steel. Background technique [0002] For the connection of thin-walled easy-to-oxidize alloy pipes with a diameter of φ5.0-φ100.0mm and a wall thickness of δ0.1mm-δ1.0mm, the argon arc welding method with small heat input is mainly used. The common groove forms are as follows: Types: end-to-end I-shaped bevel and edge bevel, such as figure 1 (a) and (b) shown. [0003] For welded joints where the end face is connected to the I-shaped groove, it is difficult to ensure the butt joint gap and position of the pipe body, and problems such as weld leakage or welding deviation are particularly prone to occur. In addition, due to the strong high-temperature activity of easily oxidized alloys, when I-shaped groove end-to-face butt welding is used, the backside ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/16B23K9/028B23K9/235B23K33/00B23K101/06
CPCB23K9/16B23K9/0282B23K9/235B23K33/004B23K2101/06
Inventor 周晓锋程方杰樊立民武少杰
Owner TIANJIN UNIV
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