Metal powder type flux-cored wire used for welding high-impact-toughness steel

Abstract

The invention relates to a metal powder type gas shield flux-cored wire used for welding high-impact-toughness steel. The metal powder type gas shield flux-cored wire comprises 0.01-0.1wt% of C, 0.1-0.4wt% of Mn, 0.01-0.03wt% of Si, 0.005-0.015wt% of S, 0.005-0.015wt% of P and balance of ferric low carbon steel skin as well as flux accounting for 14-25% of the total weight of the metal powder type gas shield flux-cored wire, wherein the flux comprises the following components in percent by the total weight of the metal powder type gas shield flux-cored wire: 1.2-4.0% of middle-carbon ferromanganese, 0.20-2.0% of ferrosilicon powder, 0.05-0.5% of magnesium powder, 0.1-2.0% of molybdenum ferrous powder, 1-2% of nickel powder, 0.05-0.2% of fused magnesia, 0.01-0.3% of fluoride and 7-14% of ferrous powder; and all the components are blended and then are placed on a low-carbon steel thin steel strip to be rolled into strips and be drawn into wires. The metal powder type gas shield flux-cored wire provided by the invention has the characteristics that almost no slag is left on a deposited metal after welding, continuous multi-layer welding without removing slag can be carried out, welding speed is fast and efficiency is high, welding technological property is good, electric arc is stable, splashing is less and moulding is beautiful, welding low temperature toughness is high and vertical down welding can be realized by virtue of short circuit transition.

Description

technical field [0001] The invention belongs to welding wire for metal material welding production, in particular to a metal powder type flux-cored welding wire for steel welding with high impact toughness; the flux-cored welding wire is especially suitable for ocean engineering and large Welding of structural steel parts. Background technique [0002] The smelting level of steel at home and abroad is constantly improving; many industries have put forward higher requirements for the impact toughness of steel. With the increase of marine engineering and large-scale welded %, Si≤0.55%, S≤0.01%, P≤0.025%, Ni≤0.70%, the balance is iron), Q500q (C≤0.18%, Mn: 1.0-1.70%, Si≤0.55%, S≤0.01 %, P≤0.025%, Ni≤1.0%, and the balance is iron) steels with high impact toughness under low temperature conditions are widely used, so it is imminent to develop welding materials for steels with good low temperature properties. In the welding of this type of steel, the welding materials commonly u...

AI Technical Summary

Problems solved by technology

In the patent document with the patent number 201010156680.8 and the invention name "Gas-shielded flux-cored wire for low-temperature high-toughness all-position welding", a TiO 2 The main high-toughness flux-cored welding wire has the characteristics of good low-temperature toughness, but a large amount of slag will be generated during the welding process, which not only affects the welding efficiency, but also enhances the labor intensity of the welder.

In order to reduce the amount of slag in the flux-cored welding process, so far, many schemes have been proposed, such as the patent document No. 200810010814.8 and the invention name "A High-Toughness Metal Core Gas Shielded Welding Wire and Its Manufacturing Method", Disclosed is a high-toughness metal-cored gas-shielded welding wire and its manufacturing method. Although the welding wire reduces the amount of slag in the welding process of the flux-cored wire to a certain extent, it still cannot realize continuous multi-layer welding without slag removal, and the operator has problems High labor intensity and poor low-temperature toughness of the weld (-20°C kv is only 100J), unable to meet the needs of marine engineering and other projects for low-temperature toughness, low welding efficiency and other defects

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