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Tungsten Carbide Composite Rod

Cemented carbide electrodes are primarily used for overlay applications in industries such as oil, mining, coal extraction, geology, and construction—particularly on components that experience severe wear or also require cutting functions. Contact our sales team to explore all your pricing options. We also offer custom sizes; simply let us know your specifications. After you leave your message, we’ll get back to you within three hours with a detailed product quote.

Phone/Fax:

+86 133-9733-9096

Email:

13397339096@ojinxin.com

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Product introduction

The cemented carbide overlay welding electrodes are made from granular sintered cemented carbide mixed with an elastic base alloy. They are coated with a special layer of flux and colored to indicate the grain size. The grains of the sintered cemented carbide consist primarily of tungsten carbide with cobalt, achieving a hardness of HRA89-91; the flux metal is either nickel or copper, offering a tensile strength of 690 MPa and a hardness of HB≥160.

Cemented carbide grains utilize sintered tungsten carbide material, with an optimized cobalt content carefully controlled between 5% and 12%, ensuring the wear resistance of the grains as well as their strong bond to the metallic base. In the nickel-copper alloy matrix, copper accounts for between 30% and 35%, resulting in a density of 14.8 g/cm³ and creating a robust supporting structure with a tensile strength of 690 MPa. The special flux coating helps minimize oxidation reactions during the overlay process, ensuring a uniform and orderly distribution of the alloy grains.

Cemented carbide electrodes are primarily used for overlay applications in industries such as oil, mining, coal extraction, geology, and construction—on components that experience severe wear or also require cutting functions. For example: milling shoes, wear shoes, aligners, reamers, drill rod joints, hydraulic cutters, scraper blades, coal mill cutter blades, core drills, pile drills, twist drills, and more.

Main dimensions

Serial number	Binding agent	Cemented carbide grains (millimeters)	Total length (mm)
1	Copper/Nickel	1.6–3.2	450/360
2	Copper/Nickel	3.2–4.8	450/360
3	Copper/Nickel	4.8–6.4	450/360
4	Copper/Nickel	6.4–8.0	450/360
5	Copper/Nickel	8.0–9.5	450/360
6	Copper/Nickel	9.5–11	450/360

Method of use

Before overlaying, the oxide layer on the workpiece surface must be removed using an abrasive grinding wheel and degreased with acetone. During the preheating phase, a neutral flame is used to heat the material up to 600–700°C, keeping the flame nozzle 25 mm away from the workpiece surface. In the overlaying process, the base alloy is first melted to create a molten pool, after which cemented carbide grains are evenly spread, ensuring the overlay thickness remains uniform—between 3 and 5 mm in a single layer. Once the overlaying is complete, the area should be covered with insulating material and allowed to cool slowly until it reaches ambient temperature.