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Titanium alloy narrow space welding method

A narrow space and welding method technology, applied in the field of titanium alloy welding, can solve the problems of slow progress and difficult operation, and achieve the effects of low equipment requirements, easy observation and operation, and not easy to be damaged by arcs

Active Publication Date: 2019-10-15
PLA NO 5719 FACTORY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for welding in special narrow spaces on parts, the operation is difficult and the progress is slow

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A certain type of aero-engine casing, the material is TC4, and it is a non-penetrating crack inside the cavity.

[0023] Grind the casing before welding to remove cracks. Grind the V-shaped opening along the crack direction to eliminate crack defects and remove oxides on the surrounding surface, see metallic luster. In order to facilitate welding, there should be a certain slope around the groove, the opening width should be (3~4) mm, and the cracks should be eliminated before welding. Scrub the place to be welded and its surroundings with alcohol or acetone,

[0024] According to the shape of the area to be welded, make an external protective box that can fit around the area to be welded outside the casing. The box has an air inlet (passing protective argon gas), and the flow rate of the protective argon gas is (15~20) L / min. The observation glass is fitted on the end face of the box body, and there are small observation holes on the observation glass, the hole dia...

Embodiment 2

[0028] A certain type of aero-engine casing, the material is TC4, and it is a non-penetrating crack outside the cavity.

[0029] Grind the casing before welding to remove cracks. Grind the V-shaped opening along the crack direction to eliminate crack defects and remove oxides on the surrounding surface, see metallic luster. In order to facilitate welding, there should be a certain slope around the groove, the opening width should be (3~4) mm, and the cracks should be eliminated before welding. Scrub the place to be welded and its surroundings with alcohol or acetone,

[0030] According to the shape of the area to be welded, make a back protection box that can fit around the area to be welded on the side of the casing. The box has an air inlet (passing protective argon gas), and the flow rate of the protective argon gas is (15~20) L / min.

[0031] Welding: Welding is performed. Welding wire: TC4; welding current: (50~90) A; welding torch argon flow: (10~15) L / min. After th...

Embodiment 3

[0033] A certain type of aero-engine casing, the material is TC4, and there are penetrating cracks both inside and outside the cavity.

[0034] Grind the casing before welding to remove cracks. Break through along the direction of the crack, eliminate the crack defect, and remove the surrounding surface oxide, see metallic luster. Scrub the area to be welded and its surroundings with alcohol or acetone, and then weld the outside first. According to the shape of the area to be welded, make an external protective box that can fit around the area to be welded on the outside of the casing. into the protective argon), the protective argon flow rate (15~20) L / min. During welding, the air leaks of the rest of the box body (except for the observation glass holes and air holes) are sealed with adhesive tape, and finally the outer protective box body is pasted and fixed with adhesive tape.

[0035] Weld the outside. Welding wire: TC4; welding current: (50~90) A; welding torch argon f...

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PUM

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Abstract

The invention discloses a titanium alloy narrow space welding method. The method comprises the steps of first, polishing before welding: polishing an area to be welded, removing surface oxides and cleaning by using an organic solvent; then mounting of a welding protection tool: attaching and fixing a box body with an inner space communicating with the area to be welded on the area to be welded, and introducing argon into the box body; and finally, welding: a welding wire penetrates through a hole formed in the end face of the box body to weld the area to be welded of a part. The method is simple to operate and high in efficiency, and the best effect of bright and white surface color of the titanium alloy after welding can be achieved at the same time; the method has less requirement for equipment, and vacuum argon filling welding equipment is not needed; and the operation can be easily observed, so that the surface of a workpiece is not prone to being damaged by electric arcs.

Description

technical field [0001] The invention relates to the technical field of titanium alloy welding, in particular to a welding method for titanium alloy in a narrow space. Background technique [0002] Due to the strong activity of titanium, neither gas welding nor manual arc welding can meet the welding quality requirements. Inert gas or vacuum protection is required during fusion welding. Parts with complex structures or welds with space curves that are difficult to effectively protect can be welded in an argon-filled box. Vacuum electron beam welding can also be applied, and brazing is generally carried out under vacuum or argon protection. [0003] Usually argon arc welding adopts open welding and welding in the box. Open welding is ordinary argon arc welding. The high temperature zone is separated from the air to prevent the air from contaminating the welding high temperature zone, and helium can also be used as a shielding gas alone. The structure and size of the nozzle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/167B23K9/235B23K9/32
CPCB23K9/167B23K9/235B23K9/32
Inventor 吴会财杨洁程小红
Owner PLA NO 5719 FACTORY