Tungsten carbide suspended bead welding method and device

Abstract

The invention discloses a tungsten carbide suspended bead welding method and device. When bead welding is conducted, a steel workpiece is clamped on an installation platform and then is preheated; after arcing is conducted on an end tab, the lower tube section of a tungsten carbide supply tube extends to the position above a bead welding area of the steel workpiece along with a water-cooled welding gun; welding sticks are melted at the corresponding position of the bead welding area of the steel workpiece, and a melting pool is formed in the corresponding position; tungsten carbide particles fall into the melting pool from a tube opening of the tungsten carbide supply tube of a tungsten carbide feeding device; under the function of magnetic stirring, molten steel in the melting pool is stirred, and the tungsten carbide particles in the melting pool roll in the molten steel; when the molten steel solidifies, the tungsten carbide particles are solidified in the original melting pool in a suspended state. According to the method, the tungsten carbide particles are directly bead-welded at the portion, with abrasion resistance needing to be increased, of a workpiece, the tungsten carbide particles are evenly dispersed on a bead welding layer from top to bottom instead of subsiding at the bottom of the bead welding layer in the bead welding process, namely, the tungsten carbide particles are suspended in the bead welding layer, and the abrasion resistant effect of the bead welding position after cooling is better.

Description

technical field [0001] The invention relates to a tungsten carbide suspension surfacing method and a device used in the suspension surfacing method. Background technique [0002] Tungsten carbide (WC) is a compound composed of tungsten and carbon with extremely high hardness. High-hardness, high-wear-resistant equipment parts, and used to manufacture high-hardness armor, etc. In addition, tungsten carbide is also an effective material for the wear-resistant industry to solve local severe wear. For example, the shovel head of a loader or the grab bucket of a loader, etc., need to frequently rub against the transported objects during work. If the shovel head or grab bucket is completely made of tungsten carbide, the cost is too high and it is unnecessary , in actual work, it is only necessary to increase the wear resistance of the local wear parts to solve the problem. [0003] Overlay welding has two functions of restoring the size of the weldment and strengthening the sur...

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Problems solved by technology

[0009] At present, there are many kinds of tungsten carbide electrodes or wires on the market. When used in combination with the above welding method, due to the mechanism of the deposition of tungsten carbide electrodes or wires, the effect after welding is not ideal; therefore, it is hoped that there is a process that can make carbonization Tungsten particles do not burn out and adhere to the overlay

However, since the specific gravity of tungsten carbide is greater than that of ordinary molten steel, tungsten carbide particles will sink to the bottom of the welding pool during the surfacing process, forming layers of tungsten carbide and surfacing materials, which cannot suspend tungsten carbide particles in the surfacing layer. It is impossible to form an effective wear-resistant surfacing layer

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