A high-toughness and atmospheric corrosion-resistant flux-cored welding wire and its preparation method

Abstract

The invention discloses a high-toughness atmosphere corrosion resistance flux-cored solder wire and a preparation method thereof. The flux-cored solder wire is made of carbon steel cold-rolled steel strip and a flux core. The flux core comprises, by mass, 25-40% of rutile, 3-7% of quartz sand, 1-3% of magnesite, 3-12% of aluminosilicate, 1-4% of sodium fluoride, 1-3% of sodium oxide, 5-15% of low-carbon ferromanganese, 3-7% of ferrosilicon, 2.5-5.5% of Ni, 2.5-7% of Cr, 1-3% of Cu, 1.5-5.5% of ferrotitanium, less than or equal to 3% of ferromolybdenum and ferrovanadium, and the balance iron powder. According to the flux-cored solder wire, welding is carried out with 100% of CO2 as protective gas, so that the flux-cored solder wire has good welding usability, and the low-temperature impact absorbing energy of the flux-cored solder wire at minus 40 DEG C is greater than 60J. Moreover, the flux-cored solder wire has good atmosphere corrosion resistance and can meet the requirements for welding of weather resistant steel with the yield strength being 450 MPa.

Description

technical field [0001] The invention relates to the field of gas-shielded flux-cored welding wire materials, in particular to a flux-cored welding wire with high toughness and atmospheric corrosion resistance and a preparation method thereof. Background technique [0002] The railway is the main artery of my country's national economy. 85% of the country's timber, 85% of crude oil, 80% of steel and 60% of coal are transported by rail. However, due to the harsh environmental conditions of railway freight, the vehicles responsible for transporting materials operate in atmospheric corrosion environments such as rain, snow, water and dust all year round, and the corrosion of steel structures of vehicles is very prominent. Before the 1980s, railway wagons were mainly made of ordinary carbon steel, which had poor atmospheric corrosion resistance and short service life. [0003] In order to improve the atmospheric corrosion resistance of vehicles and prolong the maintenance cycle ...

AI Technical Summary

Problems solved by technology

However, due to the relatively harsh environmental conditions of railway freight, the vehicles responsible for transporting materials operate in atmospheric corrosion environments such as rain, snow, water and dust all year round, and the corrosion problem of the steel structure of vehicles is very prominent

Before the 1980s, railway wagons were mainly made of ordinary carbon steel, which had poor atmospheric corrosion resistance and short service life

The use of gas-shielded solid welding wire has disadvantages such as large welding spatter and poor weld formation.

A large amount of welding spatter generated during the welding process of solid welding wire can easily lead to high work intensity for cleaning the spatter after welding. If the spatter cannot be completely removed, it will lead to poor paint coating effect on the surface of the car body

At the same time, it is difficult to adjust the chemical composition of the solid welding wire, and it is not easy to ensure the atmospheric corrosion resistance and good mechanical properties of the weld.

Although the composition of manual welding rods is convenient, it cannot realize automatic welding. The welding efficiency is low, the labor intensity is high, and the production cost is high.

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