Heat treatment/Annealing and Hardness Removal
As the market leader in marine crankshaft machining, Goltens encounters many failures which result in areas of excessive hardness every year. Loss of a crankshaft or other rotating shaft due to high hardness values is a costly, time consuming and extremely disruptive occurrence. Goltens provides expert crankshaft failure analysis and heat treatment/annealing around the globe coupled with in-situ machining solutions that minimize downtime.
Oftentimes, this hardness can be machined away by Goltens In-Situ teams. But when the hardness is so severe that cutting it away extends below the manufacturer’s limits for acceptable journal diameter, there are only two options – costly crankshaft replacement or removal of the hardness.
Goltens has demonstrated the effectiveness of the in-situ annealing process and has received Germanischer Lloyd and Lloyds Register Marine Class approvals. Over the decades, Goltens has refined its process for annealing crankshafts and other shafting and can do this successfully In-Situ as well as in our workshops around the world. A deep understanding of the metallurgy, expansion characteristics and safety precautions has been developed and refined over the years into a safe, repeatable, highly controlled process.
Our experience shows that hardness can be successfully removed via heat treatment of crankshafts and that minor finish grinding/cutting can restore the machinery to service with significantly less loss of shaft diameter as well as the avoidance of costly shaft/equipment removal and replacement.
Goltens’ brand has always been synonymous with the repair of diesel crankshafts however, every year Goltens applies this technology to problems in the marine, industrial, stationary power and offshore sectors. Goltens is routinely called upon to repair damaged journals on any and all manner of rotating equipment including compressors, turbines and other shafts and journals.
Goltens’ Annealing and Hardness Removal Advantages
- Germanischer Lloyd Class approved annealing process
- Comprehensive capability to handle all aspects of hardness treatment inclusive of engine preparation, Inspection, pre-machining, hardness removal and finish machining as well as engine reassembly
- A large, global team of highly skilled In-Situ technicians to ensure a rapid, expert response anytime and anywhere
- Deep experience successfully annealing crankshafts across a broad array of makes and models of engines and rotating machinery
- Globally deployed and available portable annealing equipment for In-Situ application
Problems Most Often Observed/Addressed with Crankshaft and Journal Annealing
- Bearing Failure / Bearing Meltdown resulting in areas in the journal surface with excessive hardness values
Partial List of Diesel Crankshafts that Goltens has successfully annealed
* Denotes the Engine Type has been successfully annealed twice
** Denotes the Engine Type has been successfully annealed 3 or more times