High-strength high-toughness gas shield flux-cored wire for high-strength steel

Abstract

The invention provides a high-strength high-toughness gas shield flux-cored wire for high-strength steel and belongs to the technical field of welding materials. The flux-cored wire comprises an outer skin and a flux core. The flux core accounts for 12%-25% of the total weight of flux-cored wire, and the outer skin is made of an industrial pure iron strip. The flux core contains, by weight, graphite powder 0%-10%, TiO2 5%-20%, Mn-Fe alloy 10%-40%, Si-Fe alloy 0.5%-2%, Al-Mg alloy 0.5%-4%, Ni 2%-15%, Cr-Fe alloy 1%-30%, Mo-Fe alloy 1%-30%, Ti-Nb-V-Fe alloy 1%-20%, fluoride 0.5%-3%, trace rare-earth yttrium element oxide Y2O3 smaller than or equal to 1% and the balance iron powder. The high-strength high-toughness gas shield flux-cored wire has the advantages that the flux-cored wire prepared according to the composition proportion is high in strength, high in toughness and moderate in hardness and does not easily carry residues, and a welded joint can be matched with a 1000 MPa high-strength steel plate in an equal strength mode.

Description

technical field [0001] The invention belongs to the technical field of welding materials, in particular to a high-strength toughness gas-shielded flux-cored welding wire for high-strength steel, which is used for gas-shielded welding of high-strength steel plates of 100KG and above. Background technique [0002] With the continuous development of my country's heavy-duty vehicle industry, steel is still the main material for the manufacture of heavy-duty vehicles, but its connotation has undergone major changes, from the previous mild steel to high-strength steel plates, combined with advanced steel processing technology , the strength of steel materials continues to increase. While realizing the lightweight of the car body, it also puts forward strict requirements on the matching high-strength and high-toughness welding consumables. [0003] At present, domestic high-strength steel plates for heavy-duty trucks are mainly made of Q550 high-strength steel and Q700 high-strength...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a high-strength toughness gas-shielded flux-cored welding wire for high-strength steel, which is suitable for welding high-strength steel plates above 1000 MPa under small input energy, and at the same time solves the problem of poor slag dragging and improves welding production efficiency