Welding wire for connection of aluminum/steel dissimilar alloy and processing process thereof

A welding wire and heterogeneous technology, applied in metal processing equipment, welding medium, manufacturing tools, etc., can solve the problems of reducing joint performance and increasing the brittleness of aluminum/steel joints, so as to enhance fluidity, increase welding wire strength, and improve compound performance Effect

Inactive Publication Date: 2010-06-23
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage of this welding wire is that it contains a high Si content, and an Al-Fe-Si ternary compound layer is formed at the interface, which increases the brittleness of the aluminum / steel joint and reduces the performance of the joint.

Method used

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  • Welding wire for connection of aluminum/steel dissimilar alloy and processing process thereof
  • Welding wire for connection of aluminum/steel dissimilar alloy and processing process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: A kind of welding wire used for aluminum / steel dissimilar alloy connection of the present invention, it is to take Al-Cu as matrix, add Ag, Mn, Mg, Ti, Zr, Zn element to develop, and this composition is by mass Percentage, containing Cu: 2.0% ~ 20.0%; Ag: 0.0% ~ 10.0%; Mn: 0.0% ~ 2.0%; Mg: 0.0% ~ 1.0%; Ti: 0.0% ~ 1.0%; Zr: 0.0% ~ 0.5% %; Zn: 0.0% to 0.5%; others are Al.

[0019] Described a kind of processing technology for the welding wire of aluminum / steel dissimilar alloy connection, steps are as follows:

[0020] (a) Material preparation: raw material: aluminum, purity ≥ 99.7%; master alloy: copper, silver, manganese, magnesium, titanium, zirconium, zinc and aluminum are first smelted into a master alloy, and the ingredients are prepared and added in the form of master alloy;

[0021] (b) Melting: preheat the crucible, put pure aluminum ingots into the crucible; after the aluminum is completely melted, add aluminum copper, aluminum silver, aluminum ma...

Embodiment 2

[0026] Example 2: Combining figure 1 , the invention is a welding wire for connecting aluminum / steel dissimilar alloys, the welding wire composition is Cu 5.5%-6.5%, Mn 0.2%-0.4%, Ti 0.1%-0.2%, Zr0.1%-0.2%, Zn 0.05 % ~ 0.1%, Al balance.

[0027] Using the welding wire with the above components, a well-formed aluminum alloy / stainless steel arc fusion-brazing butt joint was obtained, and the appearance of the joint is as follows figure 1 shown.

[0028] The welding wire composition is Cu 5.5%~6.5%, Ag 4.8%~5.8%, Mn 0.2%~0.4%, Mg 0.1%~0.2%, Ti 0.1%~0.2%, Zr 0.1%~0.2%, Zn 0.1%~0.2% %, Al balance.

[0029] The aluminum / steel dissimilar alloy TIG melting-brazing experiment was carried out with the above-mentioned welding wire, and the solder fluidity is good, the welding process is stable, and the joint is well formed.

[0030] The welding wire composition is Cu 9.8%-10.8%, Ag 3.0%-5.0%, Mn 0.5%-1.0%, Mg 0.1%-0.3%, Ti 0.3%-0.5%, Al balance.

[0031] The welding wire composition...

Embodiment 3

[0033] Embodiment 3: The purpose of the present invention is to overcome the above-mentioned defects of the welding wire and provide a new welding wire with better comprehensive performance. By adding some other special elements to replace the Si element, while ensuring the good fluidity of the solder, reduce the joint interface compound Layer brittleness.

[0034] The welding wire is developed with Al-Cu as the matrix, adding Ag, Mn, Mg, Ti, Zr, and Zn elements. The composition contains Cu: 2.0% to 20.0%; Ag: 0.0% to 10.0% by mass percentage. %; Mn: 0.0% to 2.0%; Mg: 0.0% to 1.0%; Ti: 0.0% to 1.0%; Zr: 0.0% to 0.5%; Zn: 0.0% to 0.5%; others are Al. The applicable aluminum and aluminum alloys of the present invention are all aluminum and its alloys; the applicable steels of the present invention are stainless steel, carbon steel, and alloy steel, especially stainless steel; the applicable welding methods of the present invention are arc welding and laser welding.

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Abstract

The invention aims to provide a welding wire for connection of aluminum / steel dissimilar alloy and a processing process thereof. The welding wire has a good comprehensive performance, adopts a special element to substitute the Si element, ensures good flow of solder and reduces the brittleness of the compound layer on the joint interface. In the technical scheme, the welding wire is prepared through adding such elements as Ag, Mn, Mg, Ti, Zr and Zn with Al-Cu as a matrix. The processing process of the welding wire comprises stock preparation, melting, component analysis, extrusion, wire drawing and cleaning. The invention has the advantages that: due to the high content of Cu element, the invention can inhibit the growth of the compound layer on the interface, improve the performance of the Al-Fe compound layer, and particularly improves the crack resistance of the compound layer; since the Ag element, the aluminum and the steel all have high affinity, the invention can enhance the flowing property of liquid solder in the steel surface; the Mn and Ti elements can improve the performance of the compound and the flowing property of the solder; the Mg and Zn elements can promote the flowing property of the solder and improve the strength of the welding wire; and the refined grain of Zr can also enhance the strength of the welding wire.

Description

(1) Technical field [0001] The invention relates to welding technology, specifically a welding wire used for connecting aluminum / steel dissimilar alloys and its processing technology. (2) Background technology [0002] In recent years, in order to alleviate energy pressure, reduce production costs, and optimize structural performance, aluminum / steel composite structural parts have been widely valued and applied in aerospace, automobile manufacturing, shipbuilding and other industrial fields. However, the physical and chemical properties of aluminum and steel vary greatly. , It is easy to generate brittle intermetallic compounds during the welding process, and it is difficult to achieve a reliable connection between the two by using traditional fusion welding methods. [0003] At present, laser melting-brazing and arc melting-brazing (including TIG welding, MIG welding, and CMT welding) have become popular research directions for the connection of aluminum / steel dissimilar al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/28B23K35/40C22C1/02
Inventor 林三宝宋建岭杨春利范成磊张东卫
Owner HARBIN INST OF TECH
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