Device and method for repairing friction stir welding weld defect of storage tank for carrier rocket

A friction stir welding and launch vehicle technology, which is applied in welding equipment, non-electric welding equipment, metal processing equipment, etc., can solve the problems affecting the weld strength and air tightness, so as to improve the success rate, reduce holes, and ensure the welding process is stable controllable effect

Active Publication Date: 2012-07-18
CAPITAL AEROSPACE MACHINERY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] During the friction stir welding process of the launch vehicle tank, the keyhole defect (such as figure 1 shown) is inevitable, and the existence of "keyhole" defects will bring many problems to the weld, such as: affecting the strength of the weld, air tightness, etc.

Method used

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  • Device and method for repairing friction stir welding weld defect of storage tank for carrier rocket
  • Device and method for repairing friction stir welding weld defect of storage tank for carrier rocket
  • Device and method for repairing friction stir welding weld defect of storage tank for carrier rocket

Examples

Experimental program
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Effect test

Embodiment 1

[0034] like figure 2 As shown, the repair welding stirring head used includes a stirring pin holding structure 1 and a stirring pin 2 threadedly connected to the end of the stirring pin holding structure 1 .

[0035] like image 3 As shown, the end surface of the shoulder portion of the stirring needle holding structure 1 is a concave slope 5 with an inclination angle of 10°. Two concentric annular grooves are provided on the slope 5, the depth of groove one 3 and groove two 4 is 1.3mm, and the width is 1.7mm. The radial interval between groove one 3 and groove two 4 is 1.5 mm. The outer edge structure of the end surface of the shaft shoulder part of the stirring needle clamping mechanism 1 is a rounded structure 8, and the radius R is 0.8 mm.

[0036] like Figure 4 and Figure 5 As shown, the front part of the stirring needle 2 is a conical thread structure, and the conical angle is 18°; three spiral grooves 7 are provided at the circumferential intervals of the conica...

Embodiment 2

[0039] The invention relates to a method for repairing defects of the friction stir welding seam of a carrier rocket storage tank, wherein the storage tank is welded by friction stir welding, and the storage tank is made of an 8mm thick aluminum alloy.

[0040] like Figure 6 As shown, the welding start point of the weld seam is set as point A, and the welding end point of the weld seam is point C; The weld has produced a "keyhole" defect and needs to be repaired.

[0041] The structural design parameters of the formal welding stirring head are shown in Table 1. It is welded from point A to point B and the stirring pin breaks off.

[0042]Table 1 Structural parameters of the mixing head for the formal welding of the longitudinal seam of the cylinder section

[0043]

[0044] The repair weld method includes the following steps:

[0045] (a) First, manually excavate the stirring pin broken at point B of the friction stir welding seam;

[0046] Firstly, X-ray flaw detecti...

Embodiment 3

[0057] The invention relates to a method for repairing defects of the friction stir welding seam of a carrier rocket storage tank, wherein the storage tank welding adopts friction stir welding, and the storage tank is made of aluminum alloy with a thickness of 10 mm.

[0058] Such as Figure 6 As shown, the welding start point of the weld seam is set as point A, and the welding end point of the weld seam is point C; The weld has produced a "keyhole" defect and needs to be repaired.

[0059] The structural design parameters of the formal welding stirring head used are shown in Table 3. It is welded from point A to point B and the stirring pin breaks off.

[0060] Table 3 Structural parameters of the mixing head for the formal welding of the longitudinal seam of the cylinder section

[0061]

[0062] The repair weld method includes the following steps:

[0063] (a) First, manually excavate the stirring pin broken at point B of the friction stir welding seam;

[0064] Fir...

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Abstract

The invention provides a device and a method for repairing a friction stir welding weld defect of a storage tank for a carrier rocket. A repair welding pin tool comprises a tool pin clamping structure and a tool pin, the end face of a shaft shoulder portion of the tool pin clamping structure is a recessed slope provided with two concentric-circle annular grooves, the front of the tool pin is of a conical thread structure, and a conical thread is circumferentially provided with three spiral grooves at intervals. The method includes the steps: firstly, manually excavating the tool pin broke at a friction stir welding weld; secondly, performing solid filling for the weld; thirdly, utilizing the repair welding pin tool to start friction stir welding from a center of the broke position of the tool pin filled with welding wires or materials to a set welding end point; and finally, continuing utilizing the repair welding pin tool to perform friction stir welding for the weld again from a welding start point to the welding end point. The method and the device are capable of guaranteeing the quality of the storage tank for the carrier rocket and decreasing scrapping of the storage tank for the carrier rocket due to the key hole type defect.

Description

technical field [0001] The invention belongs to a method for manufacturing a storage tank of a carrier rocket, and in particular relates to a repairing welding stirring head and a repairing welding method for repairing "keyhole" defects of friction stir welding seams of large, thin-walled and sealed structural parts. Background technique [0002] Friction Stir Welding (FSW) is a new solid phase welding technology invented by the British Welding Institute (TWI) in the early 1990s. This technology has the advantages of high quality welded joints, small welding deformation, and few weld defects. , The welding process is green and pollution-free. It is very suitable for the welding of aluminum alloys, magnesium alloys and other light alloys, and has a very wide application prospect in the fields of aerospace, high-speed trains and shipbuilding. At present, the longitudinal seams and the longitudinal seams of the storage tank section of some types of launch vehicles in my country...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/12B23K20/26B23K20/24
Inventor 赵衍华白景彬郝云飞郭刚杜宪策罗军朱平萍
Owner CAPITAL AEROSPACE MACHINERY
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