High-entropy flux cored wire for aluminum-steel MIG welding and preparation method of high-entropy flux cored wire

Abstract

The invention discloses a high-entropy flux cored wire for aluminum-steel MIG welding. Powder is prepared from, by atomic percentage, 5%-15% of Fe, 10%-20% of Al, 20%-30% of Co, 18%-35% of Cr, 20%-35%of Ni and 5%-13% of Cu, and the total percentage is 100%. Industrial high-purity copper tape is adopted for an outer skin material. A preparation method comprises the steps that firstly, a mother alloy is melted; secondly, atomized power is prepared by applying a vacuum gas atomization powdering technology; and thirdly, the high-entropy flux cored wire is prepared by the adoption of flux cored wire forming unit equipment. The high-entropy flux cored welding wire is used for aluminum-steel MIG welding, a high-quality aluminum-steel welded joint is obtained, the chemical compositions of weld metal are within a principal element range of a high-entropy alloy, and the high entropy of a weld is achieved. The weld has excellent strength and toughness, brittle intermetallic compound phases are eliminated effectively, and the good synthesized mechanical properties are provided.

Description

technical field [0001] The invention belongs to the field of welding technology, in particular to a high-entropy flux-cored welding wire for aluminum-steel MIG welding and a preparation method thereof. Background technique [0002] In recent years, due to the increasingly serious energy and environmental problems, there are urgent requirements for product lightweight in the manufacturing industries of aircraft, automobiles, trains, ships, etc., as well as in the fields of energy, aerospace, and national defense. Aluminum and aluminum alloys play an important role in the process of product lightweight due to their excellent properties of low density and high specific strength. The weight of aluminum-steel composite parts is equivalent to 50~60% of steel, and at the same time it has other excellent characteristics of aluminum and steel. It can improve material utilization, reduce structural weight, improve corrosion resistance of parts, and reduce costs. On the one hand, it h...

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Problems solved by technology

[0004] The present invention organically combines flux-cored welding wire technology and high-entropy alloy technology to obtain a high-entropy flux-cored welding wire. The purpose is to solve the problem of brittle intermetallic compounds that are easily formed when MIG welding wire is directly welded to aluminum-steel in the prior art. The problem of reducing the strength of welded joints

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