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Arc welding-brazing method for titanium-aluminum dissimilar alloy TIG (tungsten inert gas) arc preheating

A welding method and technology of melting and brazing, which is applied in the field of arc melting and brazing of titanium-aluminum dissimilar alloy TIG arc preheating, can solve the problems of reducing the mechanical properties of joints, being easy to be polluted by air, and intensifying metallurgical reactions. The effects of popularization and application, reduction of sensitivity, and low equipment cost

Inactive Publication Date: 2012-07-04
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] During the arc welding and brazing of titanium-aluminum dissimilar alloys, the temperature at the top of the titanium alloy side is significantly higher than that at the bottom, and the temperature has a decisive influence on the wetting and spreading of the liquid filling material on the titanium alloy side. Too high a temperature will lead to the metallurgical breakdown of Ti and Al at the interface. The reaction is intensified, and a large number of intermetallic compounds are generated to reduce the mechanical properties of the joint
At the same time, the chemical properties of titanium alloy are lively, and it is easy to be polluted by air. During the welding process of aluminum alloy, it is easy to produce forming defects such as collapse.

Method used

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  • Arc welding-brazing method for titanium-aluminum dissimilar alloy TIG (tungsten inert gas) arc preheating
  • Arc welding-brazing method for titanium-aluminum dissimilar alloy TIG (tungsten inert gas) arc preheating
  • Arc welding-brazing method for titanium-aluminum dissimilar alloy TIG (tungsten inert gas) arc preheating

Examples

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Effect test

Embodiment 1

[0018] Example 1: Combining figure 1 , figure 2 , the present invention a kind of titanium-aluminum dissimilar alloy TIG electric arc preheating arc melting and brazing welding method, it is characterized in that: step is as follows:

[0019] Step 1: Test equipment and workpiece preparation: 2 sets of AC and DC dual-purpose TIG welding machines, 2 bottles of argon gas, 1 set of automatic walking mechanism, 1 set of rigid fixture hollowed out at the bottom, 1 piece of copper backing plate with argon-filled forming groove , Work piece: Titanium alloy plate and aluminum alloy plate of equal thickness with Y-shaped groove of equal size on the side;

[0020] Step 2: Use rigid fixtures and copper backing plates to clamp titanium alloy plates and aluminum alloy plates of equal thickness with Y-shaped grooves of equal size on the sides;

[0021] Step 3: Place the main welding torch and the TIG preheating welding torch vertically on the groove position on the front and back of the w...

Embodiment 2

[0026] Example 2: Combining figure 1 , figure 2 , the arc melting and brazing welding method for titanium-aluminum dissimilar alloy TIG arc preheating of the present invention mainly heats the copper backing plate through the back TIG arc, relies on the copper backing plate to heat the butt joint of the titanium-aluminum joint, and passes through the forming groove Constrained forming and argon protection on the front and back sides realize the high-quality connection of titanium-aluminum dissimilar alloy arc melting and brazing, solve the contradiction between the energy control of the side line of the titanium alloy and the wetting and spreading of the bottom, and ensure the formation between the titanium alloy and the liquid filling material. Ideal brazing interface structure. At the same time, constraining the aluminum alloy side by forming grooves to form a good welded bond is of great significance for the preparation and application of high-quality welded joints of tit...

Embodiment 3

[0027] Example 3: Binding figure 1 , figure 2 , the present invention a kind of titanium-aluminum dissimilar alloy TIG electric arc preheating arc melting and brazing welding method, the steps are as follows:

[0028] (1) Test equipment and workpiece preparation: 2 sets of AC and DC dual-purpose TIG welding machines, 2 bottles of argon gas, 1 set of automatic walking mechanism, 1 set of rigid fixture hollowed out at the bottom, 1 piece of copper backing plate with argon-filled forming groove , Work piece: Titanium alloy plate and aluminum alloy plate of equal thickness with Y-shaped groove of equal size on the side;

[0029] (2) Use rigid fixtures and copper backing plates to clamp the workpiece, place the main welding torch and TIG preheating welding torch vertically on the groove position on the front and back of the workpiece, and connect them with the same set of automatic walking mechanism, and the TIG preheating welding torch is located on the main welding torch The f...

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Abstract

The invention provides an arc welding-brazing method for titanium-aluminum dissimilar alloy TIG (tungsten inert gas) arc preheating. A TIG preheating welding gun is introduced to common arc welding, a titanium-aluminum connector is locally preheated by heating a copper backing plate with a TIG preheating arc, V-shaped grooves with truncated edges are processed on two sides of each of a titanium alloy plate and an aluminum alloy plate, the copper backing plate is additionally padded at the butt joint of the connector, the TIG arc is used for heating the back of the copper backing plate, areas close to the titanium-aluminum connector are preheated by means of heat conduction of the copper backing plate, and uniform movement of the TIG preheating arc and a main arc is ensured during welding. The arc is used as a heating source, the requirement on cleaning the surface of a workpiece can be lowered by the aid of a cathode atomizing function of the arc, growth of intermetallic compounds of titanium-aluminum brazing interfaces can be hindered by the aid of an electromagnetic stirring function of the arc, appearance and distribution of the intermetallic compounds are improved, a high-strength titanium-aluminum welding connector can be formed, the equipment cost is low, practicability is high, and the arc welding-brazing method is convenient in popularization and application.

Description

(1) Technical field [0001] The invention relates to welding technology, in particular to an arc melting and brazing welding method for titanium-aluminum dissimilar alloy TIG arc preheating. (2) Background technology [0002] As light-weight and high-strength materials, titanium alloys and aluminum alloys are widely used in aviation, aerospace, automobiles and other fields. Titanium alloys have excellent properties such as high specific strength, good low-temperature toughness, and corrosion resistance, but their high cost greatly limits the application of titanium alloys. With the development of new high-strength aluminum alloys, aluminum alloys can replace titanium alloys in some load-bearing structures, and they have obvious advantages in reducing weight and controlling production costs. Titanium-aluminum dissimilar alloy composite components not only have the advantages of titanium alloys in terms of specific strength, fracture toughness, and anti-corrosion, but also red...

Claims

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Application Information

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IPC IPC(8): B23K9/167B23K9/235
Inventor 吕世雄敬小军黄永宪于冲冲徐永强郑传奇
Owner HARBIN INST OF TECH
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