Details

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KH-70-B
Type of coating: Low hydrogen type
Weld metal is martensite structure with carbide and boride precipitates

Classification


Application and Features 

• Weld metal is martensite structure with carbide and boride precipitates
• It is unable to be machined and cut
• High hardness is attainable with only one layer of weld metal. The impact resistance is inferior
• It is used in severe metal-to-earth wear, such as repairing construction machines, scraper buckets and dredge pumps

Dredge pump outlet

Welding Position


Welding Instruction

• Dry the electrodes at 300-350°C for 30-60 minutes before use
• Preheat temperature should be ≥ 200°C and PWHT should be 600°C
• Take the back-step method to prevent porosity at the arc starting
• Use high tensile strength low hydrogen electrode for the buffer layer in multi-layer build-up and base metal with high hardenability

Application
- It is used in severe metal-to-earth wear, such as repairing construction machines, scraper buckets and dredge pumps

Typical Chemical Composition of Weld Metal (wt%)


Typical Hardness of Weld Metal


Size and Suggested Operating Range (AC or DC+)