Multi-element composite rare earth tungsten electrode material and preparation method thereof

Abstract

The invention relates to a multi-element composite rare earth tungsten electrode material, which is prepared by adding rare earth oxides in a tungsten metal substrate, wherein the weight percentage of the tungsten metal substrate is 95 to 98%; and the weight percentage of the rare earth oxides is 2.0 to 5.0%. The preparation method comprises: the tungsten substrate powder is weighed according to the proportioning weight and is poured into a mixing pot, and deionized water is added to the mixture to be stirred so as to prepare a uniform suspension; lanthanum nitrate, cerous nitrate, rhenium nitrate and erbium nitrate are weighed according to the required proportioning weight and are prepared into a solution; the solution is added to the suspension to be stirred uniformly, and the mixing solution is heated and dried to prepare the mixing alloy powder; the mixing alloy powder is prepared into the rare earth tungsten composite powder through the twice hydrogen reduction; and the argon arc welding electrodes with various specifications are prepared through tamping, presintering, vertically sintering and rotary swaging. The rare earth tungsten electrode material has the advantages of good welding property, green environment protection type electrode material, good arc strike and retention of electrodes, and rapid heating and cooling properties, and the heat input on welding pieces and the dimension of a melting pool can be accurately controlled.

Description

Technical field: [0001] The invention belongs to a welding material for rare and refractory metals and a preparation method thereof, in particular to a multi-component composite rare earth tungsten electrode material and a preparation method thereof. The electrode is mainly suitable for argon arc welding. Background technique: [0002] Argon arc welding is an arc welding method in which argon is used as the shielding gas, and the arc occurs between the electrode and the weldment. Argon gas is passed around the arc to form a continuous closed gas flow that protects the arc and the molten pool. [0003] (1) Argon is an inert gas that exists in the form of single atoms, does not decompose at high temperatures, and does not react chemically with metals. During the welding process, the metal to be welded will not be oxidized or the alloying elements will be burned. Therefore, it can be used not only to weld various alloy steels, but also to weld non-ferrous metals that are easi...

AI Technical Summary

Problems solved by technology

[0009] At present, argon arc welding electrodes mainly use argon arc welding tungsten electrodes, which have the following defects: 1. Contain radioactive elements such as thorium, so they will pollute the environment

2. Electrode arcing and retention are poor

3. Slow heating and cooling

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