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Dual-hot wire system and welding method for aluminum/steel dissimilar metal TIG (Tungsten Inert Gas) arc fused braze welding

A dissimilar metal, fusion brazing technology, applied in arc welding equipment, welding equipment, metal processing equipment, etc., can solve the problems of high cost, complex process, large joint brittleness, etc., and achieve the effect of stable forming and good comprehensive performance.

Inactive Publication Date: 2015-04-22
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the traditional methods use a transition layer, such as Ag, Cu, Ni. On the one hand, the process is complicated and the cost is high, and on the other hand, the effect is not ideal
In addition, the selection of some suitable aluminum alloy welding wires can improve the joint strength to a certain extent through the action of alloy elements in them, but the joint brittleness is still very large

Method used

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  • Dual-hot wire system and welding method for aluminum/steel dissimilar metal TIG (Tungsten Inert Gas) arc fused braze welding
  • Dual-hot wire system and welding method for aluminum/steel dissimilar metal TIG (Tungsten Inert Gas) arc fused braze welding
  • Dual-hot wire system and welding method for aluminum/steel dissimilar metal TIG (Tungsten Inert Gas) arc fused braze welding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Such as figure 1 As shown, a dual heating wire system for TIG arc melting and brazing of aluminum / steel dissimilar metals, including a high-frequency power supply, a double-hole wire feeder 2, an induction heating coil 3, a fixed sleeve 4, a double-hole ceramic tube 5 and a protection The air access pipe 6, the induction heating coil 3 is set outside the double-hole ceramic tube 5, the two are coaxial, the head and end of the induction heating coil 3 are respectively connected to the two output ends of the high-frequency power supply, and the fastening of the double-hole ceramic tube 5 Inside the fixed sleeve 4, the double-hole wire feed nozzle 2 is threadedly connected to one end of the fixed sleeve 4, and the other end of the fixed sleeve 4 is connected to the protective gas inlet pipe 6. The two holes of the double-hole wire feed nozzle 2 Coaxial with and corresponding to the two holes of the double-hole ceramic tube 5, two welding wires 1 respectively penetrate thro...

Embodiment 2

[0019] The system of the present invention is used to heat two welding wires, and the welding current is reduced by using the hot wire, thereby controlling the temperature field and compound growth of the aluminum-steel brazing interface; a more stable weld seam is obtained by adjusting the diameter of the two welding wires and the wire feeding position Front and back forming; by feeding the same or different types of aluminum alloy welding wire to regulate the joint structure, and then control the joint performance.

[0020] Such as figure 2 As shown, the aluminum-steel butt welding experiment is carried out using the system of the present invention, the base metal: 5A06 aluminum alloy and SUS321 austenitic stainless steel, the plate thickness is 3.0mm, the stainless steel side adopts 30°, and the aluminum side adopts 45° V-shaped groove, The brazing flux is brushed on the stainless steel groove, and the wire feeding method of one thick and one thin, one high and one low is ...

Embodiment 3

[0022] Such as image 3 As shown, the present invention can have different wire feeding methods, and welding wires of the same diameter or different diameters can be selected, and the height of the welding wire can also be adjusted according to actual conditions. Two thin wires fed in parallel can be used when welding thin plates, and one thick and one thin, one high and one low wire feeding can be used for welding test plates larger than 3.0mm.

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Abstract

A dual-hot wire system for aluminum / steel dissimilar metal TIG (Tungsten Inert Gas) arc fused braze welding comprises a high frequency power supply, a dual-hole wire feeding port, an induction heating coil, a fixing sleeve, a dual-hole ceramic tube and a protective gas intake tube, wherein the dual-hole ceramic tube is coaxially sleeved with the induction heating coil; the front end and the rear end of the induction heating coil are respectively connected with two output ends of the high frequency power supply; the dual-hole ceramic tube is tightly fixed in the fixing sleeve; two welding wires respectively penetrate through two holes in one end of the dual-hole ceramic tube, the dual-hole ceramic tube and the dual-hole wire feeding port sequentially. The dual-hot wire system for the aluminum / steel dissimilar metal TIG arc fused braze welding is adopted to heat the two welding wires, welding current is lowered via a hot wire, and more stable obverse forming and reverse forming of a welding seam are obtained via adjusting the diameters of the two welding wires and the positions of welding wire feeding; and the performance of a connector is controlled via feeding same or different types of aluminum alloy welding wires. According to the invention, the connector for aluminum and steel, which is stable in forming and good in comprehensive performance, can be obtained.

Description

technical field [0001] The invention relates to a welding technology, in particular to an aluminum / steel dissimilar metal TIG arc melting and brazing double-hot wire system and a welding method. Background technique [0002] As the demand for energy saving and environmental protection continues to increase, in the fields of automobiles and aerospace, designers hope to use aluminum-steel composite structures to replace traditional steel structures. Therefore, the connection of aluminum and steel has always been a hot spot in the research field. However, aluminum-steel connection has always been a difficult problem in the field of welding. On the one hand, due to the obvious differences in their physical properties, such as specific gravity, melting point, thermal conductivity and expansion coefficient, etc.; the most important thing is that the two are easy to form a variety of brittle intermetallic compounds. , seriously degrades joint performance. Researchers have adopted...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/167B23K9/23
Inventor 范成磊何欢杨春利林三宝汪琼
Owner HARBIN INST OF TECH