Certification by the Japan Maritime Association! Piston crown for marine diesel engines.
The welding build-up of forged steel piston heads for diesel engines is necessary because the piston crowns used in marine engines wear out due to explosive forces. When the wear exceeds a certain level, they must be discarded; however, with our new technique, they can be welded and reused. Not only can they be reused, but their wear resistance is also improved, making them stronger and longer-lasting than the original piston crowns. Currently, there are no approved welding build-ups of high-carbon forged steel by the Japan Marine Standards Association. This will be the first approval in Japan and the world. For more details, please contact us or refer to our catalog.
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basic information
【Features】 ○ Certified by the Nippon Kaiji Kyokai (ClassNK) ○ Welding Method → Submerged Arc Welding ○ Applicable Steel Types → Mitsubishi Heavy Industries UEC Type Engine Piston Head → SCM435-QT (Carbon content less than 0.38%) and SCM440-QT (Carbon content less than 0.43%) ○ Welding Material → Kobe Steel (US80-LT) ○ Sealing Method → Kobe Steel (PF-H80K Flux) ○ Construction Conditions → The overlay construction range should be up to the wear limit of the piston head. → When performing overlay welding on the piston head, a construction procedure document must be created, and approval for on-site inspection must be obtained. ● For more details, please contact us or refer to the catalog.
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Company information
Cocabu Co., Ltd. was established in October 2011 for the purpose of welding and repairing marine diesel engine parts. The piston crowns of marine diesel engines are generally made of high carbon, Cr-Mo copper. Approval from the classification society to which the vessel belongs (is registered) is required for the welding and repair of piston crowns (compliance with regulations). Recently, Cocabu Co., Ltd. received approval from the Tokyo headquarters of the Nippon Kaiji Kyokai (NK) regarding our welding and repair plan for piston crowns. We are the only factory in Japan that can perform welding and repair of piston crowns approved by the Nippon Kaiji Kyokai (NK). Additionally, we have also received approval from the Nippon Kaiji Kyokai for our welding and repair plan using Inconel for high-temperature corrosion protection of the piston crown's combustion surface.