Waterjet stripping works by two different mechanisms. If a hard coating is being removed, then the water jet stream erodes the coating from the substrate. If it is a soft coating, then the waterjet stream pierces the coating, hits the harder substrate and spalls off the coating.

The ultra high pressure water jet process can be used to remove HVOF coatings. It is difficult, but the coatings can be removed. Newer waterjet stripping processes are being developed that utilize abrasive media, higher water pressure, pulsed waterjets to more effectively remove these hard coatings.

Yes, the process parameters as well as the nozzle and part manipulators can be controlled to remove just the top thermal spray coating, leaving the bond coat intact.

Yes, some applications require the removal of coatings in close proximity to other coatings or surfaces that need to be protected. In these circumstances, a hard masking material (usually carbide or stainless steel) can be utilized to mask the area needing protection.

The life of any waterjet nozzle is very dependent on the operating pressure as well as the water quality. Typically fan jet nozzles will last between 100 and 200 hours.

Absolutely, with control of the process parameters as well as the part and nozzle manipulation, coatings can be easily removed from aluminum substrate.

There are two different pump technologies used in water jet cleaning. The intensifier pumpmost is most popular, due to its higher pressure capability (up to 60,000 psi). An electric motor drives a hydraulic pump, creating oil pressure which drives the intensifier cylinders. The other pump type is positive displacement (PD). These pumps  work by an electric or diesel motor directly coupled to the reciprocating water pump pistons, and typically operate at lower pressures but have much higher water flow rates.

Pump seal life is directly related to the water quality as well as the operating pressure. Typical conditions result in a seal life of 300 to 500 hours.

The water pressure and flow rate used in waterjet stripping depends on the coating being removed as well as the base part material. Pressures from 20,000 psi to 55,000 psi with flows of 2 gpm to 4gpm are typically used.

No, Progressive Surface does not offer portable waterjet cleaning systems. All of our systems have automatic nozzle and part movement and high levels of process control for key process parameters.