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Processing method of high speed train aluminum alloy welding structure

A welding structure, high-speed train technology, applied in heat treatment furnaces, heat treatment equipment, furnace types, etc., can solve problems such as difficulty in adapting to complex welding structures, complex shapes and structures, etc.

Inactive Publication Date: 2013-06-05
SOUTHWEST JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a treatment method for aluminum alloy welding structures of high-speed trains, so as to solve the shortcomings that the w

Method used

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  • Processing method of high speed train aluminum alloy welding structure
  • Processing method of high speed train aluminum alloy welding structure
  • Processing method of high speed train aluminum alloy welding structure

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Experimental program
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specific Embodiment approach 1

[0007] Embodiment 1: The embodiment will be described in detail below. This embodiment includes the following steps: 1. Select an ultrasonic impact indenter for the four situations where the welding part belongs to the weld seam, the weld toe, the heat-affected zone, and the base metal full weld area. The cross-section of the ultrasonic impact indenter is " "Strip" or "Circle"; select the cross-section as "Strip" for the weld and weld toe, and select the cross-section as "Circle" for the heat-affected zone and the entire weld area of ​​the base metal 2. Assemble the selected ultrasonic impact indenter on the ultrasonic impact equipment; 3. Turn on the ultrasonic impact equipment to perform impact treatment on the surface of the aluminum alloy welded structure one by one. The positions of the impact treatment are evenly arranged and adjacent to each other. A fine-grained nanolayer of 10 μm is formed on the surface of the aluminum alloy welded structure. The welding seam, weldi...

specific Embodiment approach 2

[0008] Embodiment 2: Compared with Embodiment 1, this embodiment further defines that the ultrasonic impact equipment is Hawk energy ultrasonic impact processing equipment.

specific Embodiment approach 3

[0009] Embodiment 3: Compared with Embodiment 2, this embodiment further defines that the working frequency of the Hawk energy ultrasonic impact processing equipment is 19 to 21 kHz, the working power is 800 to 1100 W, and the amplitude is 40 to 60 μm.

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Abstract

The invention provides a processing method of a high speed train aluminum alloy welding structure, and relates to the field of welding joint residual stress elimination and fatigue performance improvement by means of ultrasonic impact technology. The processing method is used for resolving the problems that a high speed train body welding portion is mostly provided with section bars in complex structures, and the fact that existing technology is adapted to a complex welding structure is difficult. The processing method comprises the steps that aiming at the four conditions that welding portions belong to welding lines, welding toes, heat affected zones and base material all welding lines, ultrasonic impact pressure heads are chosen, ultrasonic impact pressure heads with strip-shaped sections are chosen for the welding lines and the welding toes, and the ultrasonic impact pressure heads with circular sections are chosen for the heat affected zones and the base material all welding lines; chosen ultrasonic impact pressure heads are assembled to ultrasonic impact equipment; and the ultrasonic impact equipment is started to carry out a positional impact process for the surface of the aluminum alloy welding structure one by one, various positions in the impact process are uniformly arranged and adjacent, and a 10-micrometer nanolayer is formed on the surface of the aluminum alloy welding structure.

Description

technical field [0001] The invention relates to the field of eliminating residual stress of welded joints and improving fatigue performance by ultrasonic impact technology. Background technique [0002] In recent years, my country's high-speed railway has developed intensively and rapidly, and high-speed trains have also developed rapidly. The safety and reliability of high-speed trains is the main factor restricting the development of high-speed trains. Welding is a key technology for the integration of high-speed train bodies, and the reliability of welded joints determines the safety and reliability of high-speed train bodies. The main factors affecting the reliability of welded joints are the residual stress after welding and the fatigue performance of joints under dynamic load during train operation. Due to the high thermal conductivity, large coefficient of linear expansion and complex structure of the high-speed train body aluminum alloy, the residual stress of the ...

Claims

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Application Information

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IPC IPC(8): C22F1/04C21D9/50
Inventor 于金朋张卫华张立民李远星朱宗涛王志海孙海荣刘小霞苟国庆陈辉
Owner SOUTHWEST JIAOTONG UNIV