Ultra-low hydrogen type acid flux-cored wire and production method thereof

Abstract

The invention discloses an ultra-low hydrogen type acid flux-cored wire and a production method thereof. The flux-cored wire is composed of a low-P and low-S steel strip and a flux core wrapped with the steel strip, wherein a welding flux accounts for 10%-20% of the total weight of a welding wire. The production method comprises the steps that after a heating process is carried out before and after a forming process to remove residual oil, the flux core is wrapped with the low-P and low-S steel strip through a precision forming process, and then the welding wire is obtained through diameter reduction, wire drawing and wire take-up. The flux-cored wire has excellent welding process performance, deposited metal of the flux-cored wire is excellent and stable in mechanical performance, the diffusible hydrogen content of the deposited metal of the flux-cored wire is reduced to an ultra-low hydrogen level (smaller than 3 ml/100 g, and a mercury method), and therefore a weld joint has good cold crack resistance.

Description

technical field [0001] The invention belongs to the field of welding materials, in particular to an ultra-low hydrogen type acidic flux-cored welding wire and a production method thereof. Background technique [0002] In recent years, flux cored wire has been widely used in shipbuilding, steel structure, petrochemical and other fields by virtue of a series of advantages such as high efficiency and energy saving. However, the existence of hydrogen in the weld will cause process defects such as pores, cracks, white spots and brittle fracture, so it is necessary to reduce the hydrogen content in the weld as much as possible. And such welding mainly adopts ultra-low hydrogen type flux-cored welding wire of alkaline slag system, but this welding wire is used in CO 2 When used as shielding gas, the fluidity of slag is too large, the form of droplet transfer is coarse particle transfer, the operation feel and welding process performance are extremely poor, and it is difficult to c...

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Problems solved by technology

However, one of the biggest problems with acidic flux cored wire is th

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