A self-shielding flux-cored welding wire for welding in wading environment

Abstract

The invention discloses a self-protection flux-cored wire for welding under a water environment. The self-protection flux-cored wire for welding under the water environment comprises a metal skin anda flux core. The flux core comprises components including, by mass percent, 35%-55% of rutile, 10%-20% of ferric oxide, 5%-12% of aluminum oxide, 5%-10% of calcium carbonate, 3%-8% of fluoride, 2%-5%of titanium powder, 4%-8% of nickel powder, 1%-2% of molybdenum powder and 15%-25% of iron powder. The self-protection flux-cored wire can be used for carrying out welding under the water environment,arc starting is easy during welding, arc combustion is stable, excellent welding process performance is achieved, obtained welding lines are attractive in forming, the extension strength of depositedmetal after welding is larger than 540 MPa, no cracks appear when a butt joint is 4 times the thickness of a plate and the cold bending angle is 180 degrees, good impact toughness is achieved, and welding of low-carbon and medium-carbon steel and low-alloy high-strength steel under the water environment is met.

Description

technical field [0001] The invention belongs to the technical field of welding materials, and in particular relates to a self-protecting flux-cored welding wire for welding in a wading environment. Background technique [0002] Due to the advantages of high production efficiency, good welding quality and low labor intensity, automatic welding has been widely used in construction machinery and petrochemical industries. With the improvement of the level of automated welding in my country, there are more and more demands for automated welding in some special environments, such as welding with wet or wet surfaces, or welding in rainy environments, which are collectively referred to as welding in wading environments . When welding in this environment, it is usually necessary to dry the workpiece, and then perform welding when there is no moisture on the surface of the workpiece, but its complicated pre-weld treatment greatly reduces the welding efficiency in the wading environmen...

AI Technical Summary

Problems solved by technology

When underwater wet welding with flux-cored wire is used for welding in a wading environment, more smoke and gas are generated, and a large number of pores are likely to be generated in the weld, which affects the performance of the joint

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