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High-strength and high-reliability-sealing radial friction welding method for steel pipe fitting

A technology of friction welding and steel pipes, applied in welding equipment, non-electric welding equipment, metal processing equipment, etc., can solve the difficult process of large-length stable clamping and high-speed rotation, and it is difficult to meet the high sealing requirements of high-pressure fluid steel pipes, and it is difficult to meet large Length steel pipe welding requirements and other issues to achieve the effect of saving process and process costs, avoid welding flash or weld burr, and ensure welding quality and welding strength

Active Publication Date: 2021-12-10
NO 59 RES INST OF CHINA ORDNANCE IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, steel pipes have different sizes and properties according to different uses; for example, fluid steel pipes for 10-30 MPa high-pressure fluid transportation usually require a single steel pipe to be more than tens of meters in length, and the high-pressure resistance and other sealing properties of the steel pipe are required There are higher requirements; however, the length of ordinary steel pipes is usually about 3 to 10 meters, which usually faces the problem of multi-section high-strength and high-seal connection of large-length steel pipes
[0003] At present, the traditional welding process such as manual arc welding is a common method to realize the connection of large-length steel pipes; however, after adopting MIG multi-layer multi-pass arc welding, there are usually welding defects related to solidification metallurgy such as pores and cracks in the weld, which is difficult to meet High sealing requirements for high-pressure fluid steel pipes
In the prior art, the joint strength of the inertial axial friction welding joint is high, and the welding seam does not produce welding defects related to solidification metallurgy. It is an effective method to achieve high-quality connection of steel pipes and avoid welding defects; In the welding process, the steel pipe weldment at one end needs to be rotated at high speed, but the length of the steel pipe is large, and the process of stable clamping and high-speed rotation of the large-length and heavy-weight steel pipe weldment in the welding process is difficult, and the radial runout is large, resulting in post-weld The steel pipe has problems such as poor welding coaxiality and difficulty in removing flashes in welding, and it is also difficult to meet the welding requirements of long-length steel pipes

Method used

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  • High-strength and high-reliability-sealing radial friction welding method for steel pipe fitting
  • High-strength and high-reliability-sealing radial friction welding method for steel pipe fitting
  • High-strength and high-reliability-sealing radial friction welding method for steel pipe fitting

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Experimental program
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Effect test

Embodiment 1

[0037] Radial friction welding is carried out for 20 steel rings with an outer diameter of φ70mm and 35CrMoSi steel pipes with an outer diameter of φ60mm; a high-strength, high-reliability sealed radial friction welding method for steel pipes is characterized in that:

[0038] Include the following steps:

[0039] a. According to the structural dimensions of the steel pipe and the steel ring, select the appropriate steel ring rotating and pressurizing tooling 30 and the steel pipe fixing and clamping tooling 40;

[0040] b. Carry out machining on the steel ring to be welded and the steel pipe to be welded to be welded, and process the steel ring welding blank 10 and the steel pipe welding blank 20. The specific processing dimensions of the steel ring welding blank 10 are: width 15mm, outer diameter φ70mm, inner diameter φ62mm , the specific processing size of the steel pipe welding blank 20 is φ60mm×7mm×5000mm; the tensile strength of the steel ring material to be welded is no...

Embodiment 2

[0048] Radial friction welding is carried out for 20 steel rings with an outer diameter of φ150mm and 35CrMoSi steel pipes with an outer diameter of φ130mm; a high-strength, high-reliability sealed radial friction welding method for steel pipes is characterized in that:

[0049] Include the following steps:

[0050] a. According to the structural dimensions of the steel pipe and the steel ring, select the appropriate steel ring rotating and pressurizing tooling 30 and the steel pipe fixing and clamping tooling 40;

[0051] b. The steel ring to be welded and the steel pipe to be welded are machined to process the steel ring welding blank 10 and the steel pipe welding blank 20. The specific processing dimensions of the steel ring welding blank 10 are: width 35mm, outer diameter φ150mm, inner diameter φ132mm , the specific processing size of steel pipe welding blank 20 is φ130mm×10mm×5000mm; the tensile strength of the steel ring material to be welded is not greater than 600MPa, ...

Embodiment 3

[0059] The rotary pressing tool 30 includes a tool body 31, a mounting plate 32, a ball bearing 33, an annular positioning plate 34, a telescopic rod 35, a reversing fixture 36, a radial ejector rod 37 and a clamping claw 38; the tool body 31 is a round sleeve structure and its cross-section is a stepped structure, the middle part of the tooling body 31 is provided with a through-type shaft hole 311; The central axis is collinear, and the mounting disc 32 is an annular disc; the other end of the tooling body 31 is provided with a positioning groove 315 for setting the fixed clamping tooling 40; one end of the tooling body 31 near the positioning groove 315 is fixedly sleeved with a ball bearing 33, It is used to connect with external equipment so as to fix and install the entire tool body 31. The outer wall of the tool body 31 on the side of the ball bearing 33 close to the installation groove 312 is fixedly sleeved with an annular positioning disc 34. The annular positioning d...

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Abstract

The invention provides a high-strength and high-reliability-sealing radial friction welding method for a steel pipe fitting. According to the method, a clamping mode that a rotary pressurizing tool (30) clamps a steel ring welding blank (10) and fixed clamping tools (40) clamp two steel pipe welding blanks (20) respectively is adopted, and the radial friction welding mode that the steel pipe welding blanks (20) at the two ends do not rotate, the steel ring welding blank (10) rotates and pressurizes, and annular grooves (21) are formed in the welding positions of the steel pipe welding blanks (20) at the two ends is adopted; radial friction welding of a large-length steel pipe is achieved, high coaxiality of the welded steel pipe is guaranteed, meanwhile, radial run-out caused by self-rotation of the large-length steel pipe is effectively avoided, welding flashes or weld beading and the like in the pipe are avoided, the welding quality is guaranteed, the annular grooves (21) form a double-spigot locking structure, and the welding strength and the high-reliability-sealing performance of a weldment are ensured.

Description

technical field [0001] The invention relates to the technical field of solid-phase welding, in particular to a high-strength, high-reliability sealing radial friction welding method for steel pipe fittings. Background technique [0002] Steel pipe is an economical steel material with a hollow cross-section whose length is much longer than the diameter or circumference. It can not only be used to transport fluid media such as water, petroleum, various chemical raw materials and gases, but also can be widely used in the manufacture of mechanical parts or engineering structures. , In addition, steel pipes are often used in the development and production of various conventional weapons / equipment such as artillery, shells, and armored vehicles. It can be seen that steel pipes are widely used in petrochemical, construction, automobile, agriculture, national defense and other national economic fields. In the prior art, steel pipes have different sizes and performances according to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/12B23K20/24B23K20/26
CPCB23K20/122B23K20/24B23K20/26
Inventor 陈大军李忠盛黄安畏丛大龙黄俊代野刘正涛江波
Owner NO 59 RES INST OF CHINA ORDNANCE IND
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