Marine Vessels

Industry background

Working environment: salty corrosive water or air Marine vessels and offshore equipment are in extreme environments of high salt spray and high humidity for a long time. The penetration of salt (chloride ions) and the electrochemical reaction of seawater accelerate metal corrosion. At the same time, high-speed water flow impact, alternating loads and high temperature conditions (such as the temperature near the engine combustion chamber can reach above 500°C) form a multi-factor coupling damage environment, which poses a severe challenge to the durability of parts.

Part types: key parts of engine groups, propulsion system transmission parts, offshore platform hydraulic parts

Core parts include ship diesel engine crankshafts, turbocharger blades, propeller transmission gears, hydraulic anchor valve groups and deep-sea platform lifting device racks. These parts need to have high strength, corrosion resistance and fatigue resistance. For example, the drive shaft needs to resist salt spray corrosion and microcrack expansion caused by alternating stress while bearing a speed of 3000r/min.

Failure forms: corrosion wear, fatigue wear, fracture, high temperature wear Typical failure cases include: thermal corrosion and peeling of turbine blades due to high temperature oxidation and salt deposition; abrasive wear of hydraulic plunger pairs in silty seawater, which leads to leakage due to the expansion of the fit clearance; stress concentration cracks in propeller bearings due to corrosion fatigue, which eventually lead to brittle fracture.

Solutions

High-speed laser cladding

Applicable to the efficient preparation of wear-resistant and corrosion-resistant thin coatings on the surface of marine or offshore shaft parts; with low dilution rate, small deformation, and high cladding efficiency.

Traditional laser cladding

Applicable to the repair and remanufacturing of marine or offshore special-shaped curved surfaces, and can prepare wear-resistant, corrosion-resistant, high-temperature resistant and other thick coatings; with adjustable cladding trajectory, suitable for parts with variable surface morphology, low dilution rate, and high bonding strength.

Laser application cases

Piston head laser repair

Crankshaft laser repair