A high-strength flux-cored welding wire with increased penetration and its preparation method and application

Abstract

The invention discloses a high-strength flux-cored wire capable of increasing penetration as well as a preparation method and an application of the flux-cored wire. The flux-cored wire comprises powder and a tube wall for packing the powder, wherein the powder comprises components in percentage by mass as follows: 1%-5% of 75# ferrosilicon, 8%-15% of mid-carbon ferromanganese, 12%-18% of ferromolybdenum, 4%-9% of micro-carbon ferrochrome, 2%-5% of nickel metal powder, 1%-3% of ferrovanadium, 3%-6% of ferrotitanium, 1%-2% of a rare earth ferrosilicon alloy, 0-2.0% of K2CO3 powder, 0.5%-1.5% of potassium permanganate powder and the balance of Fe powder and inevitable impurities having no influence on the performance of the flux-cored wire. The high-strength flux-cored wire has the deeper penetration, so that a base material is not required to be grooved, or only a small groove is required to be formed and a large truncated edge is required to be reserved, the filler metal quantity is reduced, and the welding productivity is greatly improved. Meanwhile, the welding defect of incomplete fusion cannot be produced easily, and the safety of a welded structure is improved.

Description

technical field [0001] The invention relates to a welding material, in particular to a high-strength flux-cored welding wire with increased penetration and its preparation method and application. Background technique [0002] With the rapid development of industrial technology, welded structures are developing in the direction of large-scale, high-parameterization, high-strength, and high-toughness. The application of high-strength and toughness medium-thick plates in welded structures is increasing. At present, argon-enriched gas shielded welding is the main process for welding medium-thick and high-strength steel plates. Welding of medium and thick plates requires beveling, multi-layer and multi-pass welding, the welding production process is complicated, and the welding production efficiency is low. Improving the welding efficiency of medium and heavy plates is one of the goals pursued by welding workers. For this reason, people have carried out research work on welding ...

AI Technical Summary

Problems solved by technology

Flux-cored wire has the advantages of stable arc, small spatter, and easy adjustment of chemical composition, but its cost is slightly higher

Solid wire has good wire feeding performance, but its composition adjustment is difficult, welding spatter is large, and arc stability is poor

Argon-enriched gas-shielded melting electrode gas-shielded welding, the existing solid welding wire and flux-cored welding wire have the problem of shallow penetration, in order to penetrate, it is often necessary to open a large groove, which increases the amount of filler metal and increases the Welding wire consumption reduces welding productivity