Self-protecting flux-cored wire for overlaying welding and use thereof

Abstract

The present invention belongs to the field of composite material producing technology, and is especially one kind of self-protecting flux cored welding wire for build-up welding and its use. The flux core of the welding wire is mixture of alloy powder and mineral powder, and consists of chromium carbide 50-80 wt%, Mn 4-10 wt%, 75# ferrosilicon 2-6 wt%, Zr-Si-Fe 1-3 wt%, graphite 3-6 wt%, dolomite 1-3 wt%, natural rutile 0.1-3 wt%, Mo 1-6 wt%, Nb 3-6 wt%, V 2-8 wt%, W 0.1-2 wt%, Na2SiF6 0.1-3 wt%, ZrO2 1-3 wt%, and NaF0.1-2 wt%. The self-protecting flux cored welding wire for build-up welding has no need of adding protecting gas and flux, stable arc, fewer spattering and other advantages. It is applied mainly for build-up welding of grinding roll, grinding disc, antiwear plate, etc.

Description

technical field [0001] The invention belongs to the field of composite material processing, and in particular relates to a self-protecting flux-cored welding wire for high wear-resistant surfacing welding, and a product used for coal grinding rollers and their grinding discs, raw material grinding rollers and their grinding discs, and various large-area wear-resistant plates. Surfacing. Background technique [0002] At present, manual arc surfacing and submerged arc surfacing are generally used in domestic surfacing, but for large-scale workpieces such as coal grinding rollers and their grinding discs, raw material grinding rollers and their grinding discs, various large-area wear-resistant plates, etc. During welding, there are different problems in the current surfacing welding process: ① manual arc welding cannot be continuous, automatic welding, the surfacing welding efficiency is too low, the working environment of the workers is harsh, and the labor intensity is high; ...

AI Technical Summary

Problems solved by technology

[0002] At present, manual arc surfacing and submerged arc surfacing are generally used in domestic surfacing, but for large-scale workpieces such as coal grinding rollers and their grinding discs, raw material grinding rollers and their grinding discs, various large-area wear-resistant plates, etc. During welding, there are different problems in the current surfacing welding process: ① manual arc welding cannot be continuous, automatic welding, the surfacing welding efficiency is too low, the working environment of the workers is harsh, and the labor intensity is high; ② submerged arc surfacing welding requires a kilogram of welding wire Consumes more than 1.5 kg of flux, and requires special flux delivery and recovery devices, which increases the cost of surfacing; ③The welding line energy of manual arc welding and submerged arc surfacing is generally higher than 20000J, and the surfacing layer The welding stress is large, and the welding residual stress is large. When performing large-area multi-layer welding of high-hardness materials, the surfacing layer itself will be peeled off, so it is impossible to realize multi-layer surfacing welding of large-area, large-thickness and high-wear-resistant workpieces.