Sintered flux for nickel base strip electroslag welding

Abstract

The invention relates to sintered flux for nickel strip electrode electro-slag welding. The sintered flux for the nickel strip electrode electro-slag welding is characterized in that the intered flux is prepared from dry powder components and binder water glass; the dry powder components comprise, by mass, 45-75% of CaF2, 15-35% of Al2O3, 1-5% of SiO2, 1-5% of CaO, 1-5% of MgO, 1-10% of sodium fluoroaluminate, 1-5% of rare earth fluoride and 1-5% of ferroniobium alloy powder; the ratio of potassium to sodium of the binder water glass is 1 to 1, the molar ratio is 2.2-3.5, the baume degree at room temperature is 38-50, and the dosage is 15-25% of the weight of the dry powder. The sintered flux can be used through being matched with various nickel base welding strip such as EQNiCrMo-3 and EQNiCr-3, when strip electrode electro-slag surfacing is conducted through matching with the nickel base welding strip, stable electro-slag process and welding technological property can be maintained at the quick welding condition of 250 mm / min, the quality of formation of surfacing layers is good, defects do not exist in lap joint, and various indexes of the surfacing layers can meet usage requirements of users.

Description

technical field [0001] The invention belongs to the field of welding materials, in particular to a sintered flux for nickel-based strip electrode electroslag welding. The flux is mainly used with nickel-based welding strips to weld nickel-based corrosion-resistant layers on the inner walls of hydrogenation equipment, coal chemical industry, nuclear containers, and urea equipment in the petrochemical industry. Background technique [0002] Nickel-based corrosion-resistant alloys refer to nickel-based (nickel content ≥ 50%) and contain alloy elements such as Cr, Mo, Cu, Al, Ti, Nb, etc., which have excellent corrosion resistance in corrosive environments and are mainly used for corrosion resistance. Alloys for corrosion applications. Since the corrosion resistance of nickel-based corrosion-resistant alloys is mainly determined by their chemical composition (alloying elements), and the matrix structure of the alloy is a face-centered cubic austenite structure, nickel-based cor...

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Problems solved by technology

[0006] At present, nickel-based electroslag surfacing welding consumables mainly rely on imports, and imported welding consumables have disadvantages such as high production costs and long delivery cycles.

There are few domestic manufacturers that can provide nickel-based electroslag surfacing welding consumables, and the research literature in related fields is very limited. For the time being, no related invention patents have been retrieved for nickel-based electroslag surfacing flux.

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