Iron-nickel-based alloy flux-cored welding electrode and preparation method thereof

Abstract

The invention discloses an iron-nickel-based alloy flux-cored welding electrode and a preparation method thereof. The welding electrode comprises a tube body, a flux core and a coating, wherein the flux core fills the tube body, and the coating wraps the tube body; the flux core is pure nickel powder, and the filling rate of the flux core in the tube body is 100%; and the coating is composed of the following components of, in percentage by mass, 42.0%-54.0% of mineral powder, 14.0%-27.0% of high-potassium feldspar powder, 3.0% of manganese metal powder, 2.0%-3.0% of titanium dioxide and the balance pure nickel powder, and the mineral powder comprises carbonate mineral powder, fluoride mineral powder and titanium oxide type mineral powder. According to the welding electrode, in the welding process, powder leakage at the electric arc end is avoided, the tube skin and the coating do not become red, the electric arc is stable, welding spatter is little, formed welding seams are attractive and smooth, welding slag completely covers and is easy to remove, multiple layers of welding seams are free of cracks and holes, surfaced metal is good in plasticity, toughness, impact resistance and vibration resistance, the work hardening effect is obvious after strong impact force is applied in use, so that the service life of a surfaced workpiece is greatly prolonged, and the welding electrode is suitable for repair and surfacing occasions of cast iron and steel castings.

Description

technical field [0001] The invention belongs to the technical field of welding materials, and in particular relates to an iron-nickel-based alloy flux-cored electrode and a preparation method thereof. Background technique [0002] In the field of sugar production, the rollers and tearing knives that are commonly used for cutting and squeezing sugarcane will cause chipping and wear of the rolling teeth during the operation process, which will seriously affect the service life of the workpiece and the production schedule. Damaged workpieces are repaired by repair welding. Most of these workpieces are made of cast iron and cast steel, and have high requirements for surfacing welding technology and materials; firstly, the bonding strength between the surfacing metal and the base metal should be high and the shock absorption should be good, and there should be no pores, slag inclusions, cracks, etc. , due to the high extrusion force during pressing, if the bonding strength is in...

AI Technical Summary

Problems solved by technology

According to the record of CN202011087345.7 "A Highly Wear-Resistant Flux-Cored Electrode and Its Preparation Method", it can be seen that the tube skin of the flux-cored electrode is thin, and the temperature rise is large, so it is easy to melt in the early stage of the welding process, resulting in leakage of the filler in the tube. powder or redness, unable to continue welding; and the resistance of the nickel-iron core is large, and the temperature rises during welding, which is easy to cause redness and waste; as far as the electrode made of nickel-iron core is concerned, if certain If there is a large amount of nickel powder, the process is better only when the coating contains a large amount of acid-base substances such as carbonate, fluoride, and slag of titanium oxide-type mineral powder, but the transition coefficient of nickel is very low at this time ; and too much acidic substances in the coating, such as titanium oxide-type ore powder, can easily cause weld porosity

The pure nickel core has high cost and high cost, so it is only considered for special occasions

However, problems such as the temperature rise of the tube skin of the tube core electrode, the melting and matching of the tube core powder and the coating, the all-position welding of the tube core coating electrode, the strengthening of the fusion force with the cast iron material, and the pore sensitivity of the high nickel content restrict The development of this new material

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