Active agent for titanium alloy tungsten electrode argon arc welding

A technology of argon tungsten arc welding and active agent, which is applied in the direction of arc welding equipment, welding medium, welding equipment, etc., can solve the problems of low energy density of TIG arc, low welding efficiency, increased welding deformation, etc. Microstructure, improving welding production efficiency and reducing welding deformation

Inactive Publication Date: 2012-08-08
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has many advantages such as large process margin, strong process adaptability and high weld quality. However, due to the low energy density and poor penetration ability of the TIG arc, the single-pass weld penetration is shallow and the welding efficiency is low. Furthermore, due to the melting point of titanium alloy High, large heat capacity, high resistivity and low thermal conductivity can easily cause overheating in the welding zone and coarse grains, resulting in reduced plasticity of the joint and increased welding deformation, thus affecting the performance of the welded joint and the life of the welded structure

Method used

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  • Active agent for titanium alloy tungsten electrode argon arc welding
  • Active agent for titanium alloy tungsten electrode argon arc welding
  • Active agent for titanium alloy tungsten electrode argon arc welding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] DC positive connection A-TIG welding is performed, and the welding process specification is shown in Table 1. When welding using the welding specification parameters in Table 1, the weld penetration of traditional TIG welding is 1.7mm and the penetration width is 9.2mm. figure 1 shown. When using the welding specification in Table 1 for A-TIG welding, the formulation of the active agent and the weld penetration and width are shown in Table 2.

[0011] Table 1 Welding specification parameters

[0012]

[0013] Table 2 Activator formulation and weld penetration and width

[0014]

[0015]

[0016] It can be seen from Table 2 that the A-TIG welding of titanium alloys using the activator of the present invention can significantly increase the weld penetration. Especially the No. 2 specimen, the penetration depth is 2.3 times that of conventional TIG welding, and the aspect ratio of the weld is 0.58. The surface and cross-section of the weld are as follows: fig...

Embodiment 2

[0018] For DC positive A-TIG welding, the composition and mass percentage of the activator used are CaF225%, CrCl3 15%, KF 10%, Te 45%. The diameter of the tungsten electrode selected for welding is 3.2mm, and the angle of the tip of the tungsten electrode is 45°.

[0019] Table 3 Welding Specification Parameters and Weld Penetration Width

[0020]

Embodiment 3

[0022] DC positive connection A-TIG welding is carried out. The welding specification is shown in Table 4. The composition and mass percentage of the active agent used are CaF. 2 25%, CrCl 3 15%, KF 10%, Te 45%. Weld cross section as Figure 4 As shown, the weld penetration reaches 2.94 times that of TIG welding with the same specification parameters. Weld X-ray inspection photos such as Figure 5 As shown, the weld is free of cracks, lack of fusion, bar defects, and round defects such as pores. The chemical composition of the weld is shown in Table 5. When welding using the welding specifications in Table 4, the weld microstructures of TIG welding and A-TIG welding are as follows: Image 6 and Figure 7 As shown, the active agent acts to refine the grains. A tensile test of the weld seam is carried out, and the weld seam is broken from the base metal, such as Figure 8 shown, the strength is higher than that of a TIG welded seam under the same welding specification. ...

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Abstract

The invention discloses an active agent for titanium alloy tungsten electrode argon arc welding, which aims to increase the weld penetration, reduce the input of welding heat, thin a weld structure and reduce the weld porosity. In percent by weight, the active agent comprises the following components: 20-30% of CaF2, 10-20% of CrCl3, 10-20% of KF and 40-50% of Te.

Description

technical field [0001] The present invention relates to active welding methods. Background technique [0002] Titanium alloy has the advantages of low density, high specific strength, good corrosion resistance and good biocompatibility. It is more and more widely used in aerospace, shipbuilding, chemical energy and medical and sports equipment, especially in aerospace In the field, its consumption reaches 70% of the total titanium material. At present, the most commonly used method for welding titanium alloys is argon tungsten arc welding (TIG welding, Tungsten Inert Gas Welding), and almost 95% of titanium alloy structural welding in China is completed by this method. It has many advantages such as large process margin, strong process adaptability and high weld quality. However, due to the low energy density and poor penetration ability of TIG arc, the single-pass weld penetration is shallow and the welding efficiency is low. High heat capacity, high resistivity and low t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/362B23K9/167B23K103/14
Inventor 黄勇何成旦吴飞虎
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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