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Pulsed laser welding method for high-pressure sealed valve body component

A pulse laser and high-pressure sealing technology, which is applied in laser welding equipment, welding equipment, metal processing equipment, etc., can solve the problems of high output heat affecting welding deformation, difficulty in effective control of welding quality, and inability to meet the use requirements, etc., to achieve Mass production with stable quality, small deformation and moderate depth of penetration

Inactive Publication Date: 2012-09-05
成都泛华航空仪表电器有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Using the conventional welding method—argon arc welding, the output heat is too large, the heat-affected zone is too wide, the welding deformation is serious, and the coaxiality cannot be controlled within 0.05mm, which cannot meet the requirements of use, and it is difficult to effectively control the welding quality from the process parameters. Control, can not fundamentally avoid welding deformation, resulting in parts scrapped
[0005] Using the conventional laser welding method, the power density is too high, the penetrating power is too strong, and the energy is too concentrated, which is prone to uneven surface formation, and the surface of the last 1 / 3 section of the weld has concave defects. The main reason for this defect is due to The gasket is too thin, the heat capacity is relatively small, and the temperature rise of the parts varies greatly during different periods of time during the welding process, especially in the last 1 / 3 section of the welding girth weld, due to the heating of the laser welding process and the heat conduction of the front weld seam , the temperature of the parts has been high, the melting amount of the weld metal is larger than that of the first 2 / 3 section, the weld shape is wider than the previous 2 / 3 section, and the depression of different depths is formed, resulting in serious deformation of the parts after welding, and the coaxial The welding depth cannot be controlled within 0.05mm. When the welding depth exceeds the seam line, it is very easy to cause local burn-through and welding leakage, resulting in the scrapping of parts

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Embodiment Construction

[0015] see figure 1 . The present invention will be further illustrated in the following examples, which are only used to illustrate the present invention and not to limit the present invention.

[0016] Preparation before welding. Use mechanical methods to remove the oxides on the surface of the joints of the parts, and use the organic cleaning agent acetone to clean the joints near the joints to be welded strictly before welding. The rigid fixing method is used to fit the valve seat and the gasket tightly into the fixture, "eight-point symmetry, bolt fastening", and the pre-tightening force is adjusted by the thread. The shrinkage of the shaft and diameter after welding is controlled by "side top pressure" to reduce angular deformation and bending deformation, thereby controlling the coaxiality of the valve seat and gasket, and ensuring the sealing effect of the valve body assembly to the greatest extent.

[0017] According to the welding characteristics of stainless stee...

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Abstract

The invention discloses a pulsed laser welding method for a high-pressure sealed valve body component and aims at providing a processing method for forming a continuous compact weld bead, which has the advantages of stable quality, higher efficiency, appropriate fusion depth of a joint after welding, regular weld joint, bright joint, uniform melting and mutually overlapped laser spots. The method disclosed by the invention is realized through the following technical scheme comprising the following steps of: (a) removing oxides on the surface of a weld and washing a joint part by a washing agent; (b) enabling a valve seat to be tightly close to a sealing gasket through a clamp, clamping on a three-jaw chuck, tilting a rotating table for 45 degrees and melting an angle joint of the valve body component; and (c) setting single pulse energy according to the characteristics of material and enabling a pulse waveform to be steep at the front and gentle at the back, thereby rapidly increasing laser energy to a peak value, rapidly heating, improving absorbability, then slowly lowering the temperature, maintaining the temperature for heating continuously, avoiding violent splashing, simultaneously increasing the fusion depth, melting the angle joint into a whole, matching with reasonable welding speed and pulse frequency, and enabling the laser spots to be mutually overlapped for forming the continuous compact weld bead.

Description

technical field [0001] The invention relates to a pulse laser welding method for a high-pressure sealing valve body assembly, in particular, it is suitable for high-pressure sealing products with different welding materials, high pressure resistance and low leakage rate. Background technique [0002] The valve body assembly is a typical high-pressure sealing product on an aero-engine, and its manufacturing precision directly affects the important characteristics of an aero-engine. Therefore, there are strict requirements on the connection of valve body components. Generally, there are two main ways to connect high-pressure sealing valve body components: overall machining and welding. [0003] Whole mechanical processing is adopted, the process is complicated, the manufacturing cost is high, and the production efficiency is low, which is not convenient for mass production, and the valve body assembly works in a special environment. The valve seat is made of heat-resistant st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/20B23K26/14B23K26/04B23K26/24
Inventor 傅志勇
Owner 成都泛华航空仪表电器有限公司
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