Self soldering flux-cored wire for aluminum/steel melt-soldering

Abstract

The invention discloss a self soldering flux-cored wire for aluminum / steel melt-soldering. The self soldering flux-cored wire is formed by an external layer metal skin and a flux core, wherein the external metal skin is made of aluminum-silicon alloy the internal flux core is made from aluminum-silicon alloy powder, tin powder, titanium powder, nickel powder, zinc powder, silver powder, rare earth and fluoroaluminate;and the mass percentage of the components are that the aluminum-silicon alloy powder takes up 5 to 30%, the tin powder 5 to 10%, titanium powder 0.5 to 10%, rare earth 0.5 to 10% , zinc powder 3 to 10%, nickel powder 0.5 to 5%,silver powder 5 to 15% and fluoroaluminate the rest.Before welding, the fluoroaluminate of the core part is first melt to moisturize and eliminate self soldering flux-cored wire of oxidation film, so aluminum / steel heat expansion coefficient difference and Fe-Al intermetallic compound numbers can be reduced; the aluminum can be hasped with the steel or high efficient welding for an abutting structure and the aluminum can be achieved; and the self soldering flux-cored wire for the aluminum / steel melt-soldering is suitable for MIG,TIG melt soldering and working as filling metal for various heat source-arc composition.

Description

technical field [0001] The invention belongs to the technical field of welding materials, and relates to a flux-cored wire for welding aluminum / steel dissimilar materials, in particular to a self-fluxing flux-cored wire suitable for melting and brazing of aluminum / steel dissimilar materials. Background technique [0002] Aluminum / steel composite structures can combine the advantages of aluminum and steel, and are an important part of modern engineering structures, such as automobiles, high-speed trains, and petrochemical industries. However, many problems can arise during welding of aluminum / steel structures. The difference between the physical properties of aluminum and steel causes greater stress in the welded joints; there are more Fe-Al intermetallic compounds in the joints, which reduces the mechanical properties of the joints; welded joints are prone to defects such as pores and cracks. Therefore, in order to obtain high-performance aluminum / steel composite structures...

AI Technical Summary

Problems solved by technology

Commercially used ER4043 and 4047 Al-Si series welding wires can be used with flux to obtain better joints, but solid welding wires lack applicability and cannot add alloying elements according to actual needs; Both CN103521943A and EP1997579A1 propose a flux-cored aluminum welding wire, the outer metal skin of the welding wire is aluminum alloy with different components, and the flux-core component is composed of flux, such as fluoride or fluoroaluminate, which does not reflect the flexibility of the flux-cored wire; CN202963800U discloses a metal particle reinforced flux-cored aluminum welding wire. The outer metal skin of the welding wire is an aluminum-silicon alloy, and the core drug powder is composed of different alloy powders, which are used for welding thinner aluminum alloys. The process is easy to be doped with impurities, and at the same time, this alloy powder is also inflexible and cannot add elements as needed

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