R＆D Of New Type Agglomerated Flux For Hardfacing

It is very valuable to use build-up welding to repair machines which inactivated by attrition. Along with the hardfacing technology's development, such as new kinds of flux-cored welding wire's appearance, the original fluxes'variety has not been able to meet the need. Developing new flux for hardfacing, now is the hot spot in the weld material research area.In view of hardfacing's characteristics, a new kind of agglomerated flux developed. The slag system of new agglomerated flux is Al2O3-CaF2-CaO-MgO-SiO2, and its alkalinity is 1.7. When cordinating with martensitic stainless steel flux-cored welding wire, the agglomerated flux can make the processing property of hardfacing good. The hardness of hardfacing's overlay is higher than 45HRC.We found that the flux have to be alkaline flux, in order to reduce the oxidation of alloy. This artical discusses the relations between welding processing property and slag's phisycal features which including expansion coefficient, melting point, viscosity and surface tensile. The discussion helps us to get a proper range of raw material's rate. Based on experiments of build-up welding, a compounding is found, which has best welding processing property.This article did research on the relations between the components and the welding processing property, the researched components are MgO, Al2O3, CaF2, CaCO3, MnO and ZrO2. As raw material for agglomerated flux, magnesite clinker is different from fused magnesite, we compaired their welding processing properties. We discussed the feasibility to use HJ431 to replace manganese minerals in agglomerated flux, and did experiments to get some proof.According to the deposit layer's hardness experiment and metallurgical structure, the agglomerated flux, which matching with the martensitic stainless steel flux-cored welding wire, can get a high wear-resisting coat.