The crankshaft is the main part with an important role in the engine structure.

The crankshaft is the part of the engine that converts the reciprocating motion of the piston into rotary motion. Accordingly, they receive force from the piston to create a torque to produce work to be sent to the working part and receive energy from the flywheel to transfer back to the piston to perform work processes.

During the working process, the crankshaft will be under the influence of the gas force, the inertia force and the centrifugal force of inertia.

The crankshaft is usually made of chromium, nickel and steel alloys: to ensure rigidity, durability and great wear resistance.

In the case of low-speed engines such as marine and stationary engines, the shaft is usually made of carbon such as C35, C40, C454 or spherical graphite cast iron.


During the inspection of the crankshaft, we noticed that the wear of the main bearing and connecting rod was quite obvious.

Process: anti-wear hard surface coating by Laser Cladding Technology

– Coating layer: usually Stellite 6, 12, 21 is a Cobalt-based alloy powder.

1. Grind worn bearings to remove damaged/contaminated layer;
2. Liquid penetration test of the grinding surface;
3. Laser Cladding
4. Grind the bearings to their original size;
5. Liquid penetrant examination of machined surfaces