Basic flux-cored wire for bridge steel

Abstract

The invention discloses a basic flux-cored wire for bridge steel and belongs to the field of welding materials. The basic flux-cored wire comprises a carbon steel coating and a coated flux core and is characterized by comprising the following components calculated according to the proportion accounting for total weight of the flux-cored wire: 1.3-1.7 percent of aluminum, 0.5-0.6 percent of magnesium, 2.5-3.4 percent of barium fluoride, 1.15-1.35 percent of ferromanganese, 0.15-0.35 percent of silicoferrite, 0.15-0.40 percent of magnetite, 1.0-1.2 percent of nickel, 0.4-0.5 percent of arc stabilizer, 0.6-0.9 percent of aluminum oxide, 0.25-0.4 percent of zircon sand and the balance of ferrous powder and inevitable impurities, wherein the arc stabilizer is formed by mixing potassium titanate, magnesite, cryolite and potassium silicate powder according to weight ratio of 2:2:4:2. The flux-cored wire can meet all-position welding and has the characteristics of high welding efficiency, lowsplash, low soot amount and favorable cracking resistance; and the weld metal has the tensile strength of 500-690MPa and low-temperature impact ductility (-50DEG C) more than or equal to 54J.

Description

technical field [0001] The invention relates to a welding material, in particular to a basic flux-cored welding wire for bridge steel, which belongs to the field of welding materials. technical background [0002] At present, in the welding of bridge steel Q370qE and Q420qE, the main welding materials used are: manual electrode, gas shielded solid welding wire, submerged arc welding wire and flux cored welding wire. Manual welding electrodes can meet the requirements of the user in terms of performance and technology, but the efficiency is low, the deposition efficiency is low, and the waste is large. The efficiency of the solid wire is high, but the spatter of the solid wire is large, and it needs to be processed and polished after welding. Submerged arc welding wire can only be used in flat welding positions. Flux-cored wire has its unique advantages, such as high deposition efficiency, good weld quality, small welding spatter, easy mechanization and automatic welding, a...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects and deficiencies of the existing basic flux-cored welding wire, such as large spatter, low weld strength and low-temperature impact toughness, and inability to realize all-position welding, and provide a basic flux-cored welding wire for bridge steel. The cored wire can meet the requirements of all-position welding under the condition of direct current connection

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