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Welding wires for aluminum alloy/steel dissimilar metal welding

A technology of dissimilar metals and aluminum alloys, applied in welding media, welding equipment, metal processing equipment, etc., can solve the problems of low strength of welding wire joints, achieve the effect of improving welding efficiency, improving tensile strength and beautiful appearance

Inactive Publication Date: 2015-12-23
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a welding wire for aluminum alloy / steel dissimilar metal welding, which solves the problems of low joint strength of the existing welding wire and the need for coating or flux coating on the steel surface.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Welding wire preparation: first use alcohol to mix ZnO powder with CsAlF 4 The mixture (the mass fraction of ZnO is 60%, 200ml of 95% alcohol per 50g of mixture powder) is adjusted into a uniform paste and dried to obtain the drug core composition. Use the strip with the same composition as ER4043 aluminum-silicon welding wire (width 8mm, thickness 0.5mm) to roll into a U shape, fill the core composition to the bottom of the U-shaped groove, the filling rate is 30%, close the U-shaped groove, and make the core The ingredients are wrapped in it. Then make it pass through wire drawing dies with different diameters, draw and reduce the diameter for many times, and finally obtain a flux-cored welding wire with a diameter of 1.8 mm.

[0014] 5A02 aluminum alloy (thickness 2mm) / Q235B carbon steel (thickness 1.5mm) lap joint test was carried out using the above welding wire, and the welding method was argon tungsten arc welding. The shielding gas (Ar) flow rate is 10L / min, t...

Embodiment 2

[0016] Welding wire preparation: first use alcohol to make the mixture of ZnO powder and CsAlF4 (ZnO mass fraction is 70%, every 50g mixture powder is mixed with 95% alcohol 200ml) into a uniform paste, and then dry to obtain the core composition. Except for using strips with the same composition as ER4047 Al-Si welding wire, a flux-cored welding wire was prepared according to the same method as in Example 1, with a flux-core filling rate of 30% and a wire diameter of 1.8 mm.

[0017] 5A02 aluminum alloy (thickness 2mm) / Q235B carbon steel (thickness 1.5mm) lap joint test was carried out using the above welding wire, and the welding method was argon tungsten arc welding. The shielding gas (Ar) flow rate is 10L / min, the welding speed is 2mm / s, and the arc length is 3mm. The results show that the droplet transfer is stable during the welding process and spreads and wets well on the steel surface, and the weld shape obtained is beautiful. In addition, when the welding current is ...

Embodiment 3

[0019] Welding wire preparation: first use alcohol to mix ZnO powder with CsAlF 4 The mixture (the mass fraction of ZnO is 60%, 200ml of 95% alcohol per 50g of mixture powder) is adjusted into a uniform paste and dried to obtain the drug core composition. Except for using pure aluminum strips, a flux-cored welding wire was prepared in the same manner as in Example 1, with a flux core filling rate of 30% and a welding wire diameter of 1.8 mm.

[0020] 5A02 aluminum alloy (thickness 2mm) / AISI304 stainless steel (thickness 1.5mm) lap joint test was carried out using the above welding wire, and the welding method was argon tungsten arc welding. The shielding gas (Ar) flow rate is 10L / min, the welding current is 50A, the welding speed is 2mm / s, and the arc length is 3mm. The results show that the droplet transfer is stable during the welding process and spreads and wets well on the steel surface, and the weld shape obtained is beautiful. In addition, when the wire feeding speed i...

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Abstract

The invention provides a welding stick used for welding aluminum alloy / steel dissimilar metal. The welding stick used for welding the aluminum alloy / the steel dissimilar metal is characterized by comprising a core formed by packaging and filling the zinc oxide (ZnO) powders and fluoride brazing flux CsAlF4 or KAlF4 mixed evenly in the welding stick core portion. A test result shows that particularly when the welding stick with the core comprising the ZnO powers with mass percent ranging from 60% to 80% is used to connecting the aluminum alloy / the steel dissimilar metal, the molten welding stick can spread out and moisten well on the steel surface, and the gained aluminum alloy / steel connector is beautiful in appearance and strong in strength of extension.

Description

technical field [0001] The invention belongs to the field of metal material welding, and in particular relates to a welding wire used for welding aluminum alloy / steel dissimilar metals. Background technique [0002] The aluminum alloy / steel dissimilar metal welded structure can make full use of the inherent advantages of the two materials, such as weight reduction, material saving, energy consumption reduction, pollution reduction, etc. Therefore, it is of great practical significance to realize the reliable connection of aluminum alloy and steel. [0003] The research found that the addition of Si element in the weld can effectively inhibit the growth of the Fe-Al brittle intermetallic compound layer in the aluminum alloy / steel dissimilar metal welding interface layer. The tensile strength can reach 125 MPa (non-patent literature 1: LINSB, et al., Metallurgical and mechanical investigations of aluminum-steel butt joint made by tung steninert gas welding-brazing, Science an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/368B23K35/28
Inventor 董红刚郝晓虎
Owner DALIAN UNIV OF TECH
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