Coating & Overlay

The SparkDepo is a new surface enhancement process, and deposits an alloy or applies a hard coating by means of electric sparks from rotating electrode.
Preventive maintenance of various machine components, tooling, dies, and molds can be accomplished by the application of hard coatings using WC, TiC, TiB2, Cr3C2, VC, etc. electrodes. Low heat input alloy overlay is posssible using the electrod of Ni, Co, Cu, or Al alloys. The SparkDepo process is truly a new plant maintenance technique. The use of SparkDepo really increases productivity and reduces maintenance cost because of the reduced maintenance time and parts inventory.

Advantages of SparkDepo Process

• Easy to operate.
• Portable and usable with 100 to 220 volt outlet.
• On-site repair work which requires no dismantling of large machines.
• Extremely low heat input eliminates distortion, pits, shrinkage, and internal stress.
• Requires no pre and post heat treatment.
• Provides excellent bonding by the formation of diffusion layer.
• Rotating consumable electrode gives high deposition efficiency and produces excellent coating.
• High power output allows thick coating and retains its property for extended period.
• Very smooth as-coated surface is obtained with a vibratory applicator.
• Inert shield gas (Ar, He, etc.) produces excellent thick coating.
• Repeatable coating thickness and surface roughness can be obtained by adjusting the level of power output and frequency.
• Finishing stock of the overlay can be kept to the minimum, reducing finishing time.
• Repeated overlay is possible over worn out coating.
• Environmentally safe. Produces no toxic gas, liquid, or unpleasant odor and noise.
• Application of “DiaCoat”, fine spherical diamond particles, over the coating reduces the coefficient of friction.