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Laser welding method for titanium alloy blade

A welding method and technology of titanium alloy, applied in laser welding equipment, welding equipment, welding/welding/cutting objects, etc., can solve the problems of lowering yield, surface collapse, shrinkage porosity, etc., to improve connection strength, avoid Stress concentration, effect of improving welding quality

Active Publication Date: 2017-03-22
QINGDAO BRANCH CO., LTD. OF MECHANICAL SCIENCE RESEARCH INSTITUTE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Titanium alloys are mainly used to make aircraft engine compressor parts, followed by structural parts of rockets, missiles and high-speed aircraft. Currently, TiAl alloys have been used in aircraft engine blades due to their small specific gravity, high strength, and high temperature resistance. The current TiAl In the production of alloy blades, the integral molding method of precision casting is mostly adopted. However, since the connection between the blade body and the base is the area where the hot joint is located, shrinkage cavity and shrinkage defects are prone to occur during the precision casting process. In the subsequent isostatic pressing process Surface collapse is prone to occur in the medium, which reduces the yield

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] 1) Process grooves at the joints of the blade, the blade body and the base. The grooves are Y-shaped grooves with a blunt edge gap of 2 mm. T-shaped interlocking parts are processed on both sides of the grooves. The T-shaped component includes a first end and a second end, the width of the first end is 2mm, and the width of the second end is 1.3mm, and the connection between the first end and the second end adopts a round corner transition, and the The T-shaped parts are alternately distributed on both sides of the groove, with an interval of 5mm, and form an interlocking structure during welding. It is carried out by using YAG laser or CO2 laser plus electric arc as the composite heat source, and the method of cold metal transition. The first layer The laser power used is 10KW, the current is 220A, the welding speed is 0.8m / min, the wire feeding speed is 70ipm; the laser defocus is 5mm, the laser power used for the second layer welding is 8KW, the current is 280A, and t...

Embodiment 2

[0013] A laser arc composite heat source cold metal transition welding method for a titanium alloy blade is characterized in that it comprises the following steps:

[0014] 1) Process grooves at the joints of the blade, the blade body and the base. The grooves are Y-shaped grooves with a blunt edge clearance of 2.5 mm. T-shaped interlocking parts are processed on the slopes on both sides of the grooves. , the T-shaped component includes a first end and a second end, the width of the first end is 2-2.5mm, the width of the second end is 1mm, and the connection between the first end and the second end adopts a round transition, The T-shaped components are alternately distributed on both sides of the groove, with a spacing of 5 mm, and form an interlocking structure during welding.

[0015] 2) Welding process, using laser plus arc as composite heat source, cold metal transition, double-layer single-channel method, the laser power used in the first layer is 10KW, the current is 220...

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Abstract

The invention discloses a laser welding method for a titanium alloy blade. The laser welding method for the titanium alloy blade comprises the following steps: processing a groove in a joint, wherein the groove is a Y-shaped groove; and respectively processing T-shaped interlocking components on inclined surfaces of two sides of the groove. Each T-shaped component comprises a first end and a second end, a position where each first end is connected with the corresponding second end is in fillet transition, the T-shaped components are alternately distributed on the surfaces of two sides of the groove, the distance between each two T-shaped components is 4-8 mm, an interlocking structure is formed during welding, a mechanical interlocking structure can be formed between a blind hole filled with welding flux and a base material during welding, therefore, the strength of a welding position is improved remarkably, repeated design experiments of the groove are avoided, and the time is saved.

Description

technical field [0001] The invention belongs to the technical field of material processing, and in particular relates to a laser welding method for titanium alloy blades. Background technique [0002] Titanium is an important structural metal developed in the 1950s. Titanium alloys are widely used in various fields because of their high strength, good corrosion resistance, and high heat resistance. Many countries in the world have recognized the importance of titanium alloy materials, researched and developed them one after another, and obtained practical applications. In the 1950s and 1960s, it mainly developed high-temperature titanium alloys for aero-engines and structural titanium alloys for airframes. In the 1970s, a batch of corrosion-resistant titanium alloys were developed. Since the 1980s, corrosion-resistant titanium alloys and high-strength titanium alloys have been further developed. develop. Titanium alloys are mainly used to make aircraft engine compressor pa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/348
CPCB23K26/348B23K2103/14
Inventor 王西峰徐良杨海锋
Owner QINGDAO BRANCH CO., LTD. OF MECHANICAL SCIENCE RESEARCH INSTITUTE
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