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Vacuum electron beam welding method for thin-wall titanium alloy box structure with multiple cabin sections

A vacuum electron beam and electron beam welding technology, which is applied in the direction of electron beam welding equipment, welding equipment, welding/welding/cutting items, etc., can solve the problems of large welding deformation, error accumulation, and difficulty in achieving the shape accuracy of the box. To achieve the effect of air tightness

Active Publication Date: 2015-08-26
BEIJING XINGHANG MECHANICAL ELECTRICAL EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the traditional automatic argon arc welding technology can ensure the strength requirements of the box structure, its welding deformation is relatively large; at the same time, for the welding of multi-chamber box structures, the method of multiple clamping and multiple welding is usually used segment by segment. , resulting in the accumulation of errors, it is difficult to meet the requirements of the box shape accuracy

Method used

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  • Vacuum electron beam welding method for thin-wall titanium alloy box structure with multiple cabin sections
  • Vacuum electron beam welding method for thin-wall titanium alloy box structure with multiple cabin sections
  • Vacuum electron beam welding method for thin-wall titanium alloy box structure with multiple cabin sections

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] An electron beam welding method with a total length of 4560mm for a butt weld structure of a thin-walled (2mm) titanium alloy box (outer diameter 480mm) with six compartments and five girth welds.

[0085] Step 1: Preparation before welding

[0086] (1) Pickling the titanium alloy compartment to remove the oxide film and non-metallic impurities on the surface of the parts, and place it in a low-vacuum clean environment to ensure electron beam welding within 24 hours.

[0087] (2) Grind the joints of each component (especially the joint end face) with a wind brush until the metallic luster is exposed, and wipe it clean with a white silk cloth dipped in acetone. No oil, fingerprints, thread ends, impurities, etc. are allowed.

[0088] Step 2: Assembly Tooling

[0089] (1) Pre-set copper skin in the box to prevent the electron beam from damaging the opposite box.

[0090] (2) adopt Figure 4 The ring welding tooling in Figure 5 and the external pressure snap ring toolin...

Embodiment 2

[0106] An electron beam welding method with a total length of 3500mm for a butt weld structure of a thin-walled (3mm) titanium alloy box (outer diameter 600mm) with four compartments and three girth welds.

[0107] Step 1: Preparation before welding

[0108] (1) Pickling the titanium alloy compartment to remove the oxide film and non-metallic impurities on the surface of the parts, and place it in a low-vacuum clean environment to ensure electron beam welding within 24 hours.

[0109] (2) Grind the joints of each component (especially the joint end face) with a wind brush until the metallic luster is exposed, and wipe it clean with a white silk cloth dipped in acetone. No oil, fingerprints, thread ends, impurities, etc. are allowed.

[0110] Step 2: Assembly Tooling

[0111] (1) Pre-set copper skin in the box to prevent the electron beam from damaging the opposite box.

[0112] (2) adopt Figure 4 The girth welding tooling () and Figure 6 The external pressure snap ring t...

Embodiment 3

[0128] An electron beam welding method with a total length of 1500mm for a bottom-locked structure of a thin-walled (1.8mm) titanium alloy box (outer diameter 400mm) with two compartments and one girth weld.

[0129] (1) Pickling the titanium alloy compartment to remove the oxide film and non-metallic impurities on the surface of the parts, and place it in a low-vacuum clean environment to ensure electron beam welding within 24 hours.

[0130] (2) Grind the joints of each component (especially the joint end face) with a wind brush until the metallic luster is exposed, and wipe it clean with a white silk cloth dipped in acetone. No oil, fingerprints, thread ends, impurities, etc. are allowed.

[0131] Step 2: Assembly Tooling

[0132] (1) Pre-set copper skin in the box to prevent the electron beam from damaging the opposite box.

[0133] (2) adopt Figure 4 The girth welding tooling and the external pressure snap ring tooling shown in Figure 5 are used to assemble the compone...

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Abstract

The invention belongs to the field of welding technologies and particularly relates to a vacuum electron beam welding method for a thin-wall titanium alloy box structure with multiple cabin sections. All the cabin sections are welded by adopting the method of integral assembling and one-shot clamping, a reasonable welding sequence and reasonable welding parameters are selected, welding deformation and weld joint quality are controlled, and the technical difficulties that products are poor in integral rigidity and welding deformation is difficult to control are overcome. According to the scheme, a welded joint, achieving single face welding, double face forming and back face spatter avoiding, of a thin-wall titanium alloy box is achieved, and welding quality meets the requirements of the primary national military standard GJB1718A-2005 Electron Beam Welding. After the multiple sections of the box are spliced and welded, the appearance precision requirements that cylindricity is smaller than 1.0 mm-1.5 mm and coaxiality is smaller than 2 mm-3 mm, and meanwhile the hydraulic pressure strength and the airtight strength of the box meet product use requirements.

Description

technical field [0001] The invention belongs to the field of welding technology, and in particular relates to a vacuum electron beam welding method for a multi-chamber thin-walled titanium alloy box structure. Background technique [0002] Due to its high specific strength and specific stiffness, good oxidation resistance and corrosion resistance, and good processing, forming and weldability, titanium alloys have been widely used in important structural parts such as aviation and aerospace vehicles. Welding is an important means of titanium alloy processing. It has the advantages of improving material utilization, reducing structural weight, reducing costs, and meeting airtight requirements, and has become an indispensable connection method. Such as figure 1 As shown, in the aerospace vehicle equipment, higher requirements are put forward for the structure of the multi-chamber thin-walled titanium alloy box. It is necessary to ensure the welding quality and meet the require...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K15/04B23K103/14
CPCB23K15/0006B23K15/0026B23K15/0033B23K15/04B23K2103/14
Inventor 高丽娇朱冬妹熊亮同赵红凯高海涛刘章光刘晓龙
Owner BEIJING XINGHANG MECHANICAL ELECTRICAL EQUIP
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