Technological method of repairing tc4-dt titanium alloy by laser cladding

A TC4-DT and laser cladding technology, which is applied in the coating process and coating of metal materials, can solve the problems of affecting the performance of the base metal, the economic loss of titanium alloy parts, and the complex structure, so as to prolong the service life and reduce the number of workpieces Effect of deformation and high energy density

Active Publication Date: 2018-06-05
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The processing tolerance of titanium alloy forgings and the damage of forgings during use make the parts can only be scrapped. However, titanium alloy parts, especially TC4-DT whole frame materials, have high cost, large specifications and complex structure. The cycle is long, and the scrapping has brought great economic losses to the manufacture of titanium alloy parts, and also increased the production cost of the aircraft
[0004] When repair welding TC4-DT titanium alloy forgings, the heat input of argon tungsten arc welding is too large, which may easily cause welding cracks and parts deformation, and the welding heat cycle will affect the performance of the base metal, and the repair welding quality cannot be guaranteed

Method used

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  • Technological method of repairing tc4-dt titanium alloy by laser cladding
  • Technological method of repairing tc4-dt titanium alloy by laser cladding
  • Technological method of repairing tc4-dt titanium alloy by laser cladding

Examples

Experimental program
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Effect test

Embodiment 1

[0043] Repairing cracks in TC4-DT titanium alloy forgings by laser cladding.

[0044] (1) Prepare 150-300-mesh TC4-DT powder for restoration;

[0045](2) The measured crack length is 17.32 mm. Use a manual grinding gun to completely remove the cracks on the forging, and grind to obtain a V-shaped groove with a length of about 25 mm, a width of about 10 mm, and a depth of about 3 mm, which is cleaned with acetone;

[0046] (3) Install the laser cladding head with additional drag cover and mesh copper sheet;

[0047] (4) Carry out laser cladding filling to the polished groove by adopting the process parameters in Table 1;

[0048] The process parameter of table 1 concrete example one

[0049]

[0050] (5) After the repair, the cladding layer is measured to have a machining allowance of 0.64mm;

[0051] (6) Fluorescence detection and X-ray detection are carried out on the repaired workpiece, and there are no cracks, unfused, inclusions and other defects;

[0052] (7) Use t...

Embodiment 2

[0057] Repair of pre-cracks in TC4-DT titanium alloy test block by laser cladding.

[0058] (1) Prepare 150-300-mesh TC4-DT powder for restoration;

[0059] (2) Preset a 10mm crack on the TC4-DT test block, use a manual grinding gun to completely remove the crack on the test block, and grind to obtain a V-shaped groove with a length of about 14mm, a width of about 8mm, and a depth of about 2.5mm. Wipe clean with acetone;

[0060] (3) Install the argon-filled environmental protection cover 8, the upper part of the argon-filled environmental protection cover is installed on the chuck 9 at the rear end of the laser welding head and tightened with a clamp 10, and the lower part of the argon-filled environmental protection cover is installed on the working chassis 11 and clamped The hoop 12 is tightened, the chuck 9 is provided with an exhaust port 13 and an oxygen content measurement port 14, and an air inlet 15 is provided on the chassis of the workbench. The TC4-DT titanium all...

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Abstract

The invention belongs to the technical field of laser processing, relates to a process method for adopting laser cladding to repair TC4-DT forged pieces, and is mainly used for maintenance of the processing out-of-tolerance and the service damage of TC4-DT titanium alloys. The method directs at TC4-DT titanium alloys, TC4-DT powder is selected and used as a cladding material; a cylindrical additional dragging cover is mounted at the front end of a laser cladding head; a mesh copper sheet is arranged inside the additional dragging cover and is located between the laser cladding head and the dragging cover; air holes are formed in the dragging cover. Through the method, reasonable laser cladding process parameters are used for repairing the TC4-DT forged pieces with the processing out-of-tolerance or the service damage; the deformation of the repaired parts is very small and is controlled within a tolerance range; the repaired positions are free of crack defects; and the service life of the repaired workpiece is prolonged. The method can be carried out in the atmosphere or argon-filled environment, is convenient to operate and adjust, and is suitable for repairing the parts.

Description

technical field [0001] The invention belongs to the technical field of laser processing, and relates to a process method for repairing TC4-DT forgings by laser cladding, which is mainly used for repairing TC4-DT titanium alloy processing out-of-tolerance and service damage. Background technique [0002] In order to meet the design requirements of light weight, long life and high environmental adaptability of the aircraft, a large number of titanium alloys and their application technologies are used in the body structure. Among them, TC4-DT damage-tolerant titanium alloy accounts for about 50% of the titanium alloy used in the whole aircraft, and is widely used in key load-bearing structures such as the main load-bearing frame of the fuselage and the main beam of the wing. [0003] The processing tolerance of titanium alloy forgings and the damage of forgings during use make the parts can only be scrapped. However, titanium alloy parts, especially the TC4-DT frame, have high ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C24/10
CPCC23C24/103
Inventor 李万青费跃孙兵兵陈冰清张学军
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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