Restorative maintenance, build-up

ECONOMIC EFFICIENCY

PART QUALITY AFTER REPAIR

FUNCTIONAL COATINGS

Build-up has a high economic efficiency (on average, not more than 25 – 30% of a new part cost), this method is also applied to restore complex and expensive parts. On average, 8-15 repair cycles are conducted before the replacement with a new assembly. The operation life of the parts after restorative maintenance is compared with the duration of the new spare parts’ operation.

A built-up metal is quite similar to the main metal in terms of its composition and mechanical properties. If the requirements to the product are high, after the build-up operation and machining one conducts ultrasonic inspection and liquid penetrant tests but this stipulates for a different “coating” technology and the specialist qualification and, naturally, for a different cost.

The build-up method provides for additional metal and alloy layer coating to obtain the surface layer with necessary functional properties. For example, the main metal provides for a necessary structural strength while the built-up metal brings special pre-set properties: wear resistance, necessary heat or corrosion resistance, etc.

Restorative maintenance of rotating bodies and parts with a circular section:

• Rolls of flattening machines and rolling mills.
• Crane wheels, axes, rolls.
• Rods and pistons, shafts.

Freeform and flat part repair

• Pump hydraulic control boxes and body frames.
• Die tooling: matrices and male moulds, die beds.
• Non-loaded low-speed gear boxes.

Galvanic restorative maintenance

• Rods and pistons, guideways, bearing seats on shafts, spindles.