Japan Nippon Nisshin BKR-90H/BKR-90 High-Speed Steel Welding Electrode Edge Welding Electrode Alloy Steel Overlay Welding Electrode

Features

• Excellent Re-ignition and Slag Removal Performance: BKR-90H offers outstanding re-ignition and slag removal capabilities, ensuring a smooth welding process and reducing the occurrence of welding defects².
• Good Hardness and Toughness: BKR-90H is a lime-titania type electrode, while BKR-90 is a basic electrode. The deposited metal from both can improve Mo high-speed steel, providing stable hardness and crack resistance. Particularly after heat treatment, higher hardness can be achieved while maintaining toughness².
• Excellent High-Temperature Softening Resistance: It exhibits excellent resistance to softening at high temperatures, making it suitable for high-temperature metal friction conditions².

Specifications²

Common specifications include 2.5mm, 3.2mm, and 4.0mm.

Mechanical Properties²

• BKR-90H: Hardness can reach 720-830HV, 61-65HRC, and 83-90HS.
• BKR-90: After one tempering at 150°C for 1 hour, hardness is 63-67HRC and 87-95HS; after two temperings at 550°C for 1 hour, hardness is 83-90HS.

Welding Process²

• Preheating: Generally requires preheating at 300-500°C.
• Post-Weld Treatment: To prevent cracking, slow cooling with insulation measures is necessary after welding. LS-50 can be used as an intermediate layer to effectively prevent cracks. Additionally, tempering at 550-580°C can improve hardness and wear resistance.
• Drying: Before use, BKR-90H electrodes need to be dried at 150-200°C for 30-60 minutes; BKR-90 electrodes need to be dried at 250-300°C for 30-60 minutes.

Applications¹

• Mold Manufacturing and Repair: Particularly suitable for surfacing and repairing high-speed steel series molds. It can be used to reinforce critical areas such as mold edges and cutting edges, improving wear resistance, impact resistance, extending mold lifespan, and reducing maintenance and replacement costs.
• Tool Repair and Reinforcement: Ideal for surfacing the cutting edges of various tools and blades, providing higher hardness, wear resistance, and toughness. This enhances cutting performance, maintains edge sharpness, reduces wear and blunting, and improves processing efficiency and quality.
• Wear-Resistant Component Manufacturing and Repair: Suitable for manufacturing or repairing mechanical parts subjected to high-impact wear, such as crusher hammers in mining machinery and loader bucket edges. It improves wear and impact resistance, ensuring reliable performance in harsh environments, extending service life, and reducing equipment maintenance and replacement costs.