Removing coatings and corrosion from aircraft components often requires abrasive blasting, sanding, and hazardous chemicals to prepare the surfaces for repair.
To potentially make that process more efficient, engineers and artisans at the U.S. Fleet Readiness Center East (FRCE), located at the Marine Corps Air Station Cherry Point in North Carolina, recently observed a demonstration of a quicker, more efficient way to clean these parts.
FRCE is North Carolina's largest maintenance, repair, overhaul and technical services provider, with more than 4,000 civilian, military and contract workers. Its annual revenue exceeds $900 million.
How the Process Works
This process that was demonstrated involves using a laser light to remove corrosion and coatings from containers and aircraft components.
The advanced technology and innovation (ATI) team within FRCE’s materials engineering division has worked for some time to bring laser ablation technology to the facility. According to the team, the laser system is quicker, cleaner, and safer than traditional methods of metal cleaning. Recently, the team and other FRCE engineers, maintenance professionals, and interested parties had the opportunity to see a demonstration of the handheld laser ablation system.
“Plastic blasting and mechanical removing with sanders are similar processes, but they create a lot more dust and waste,” said Chase Templeton, lead engineer for robotics, support equipment, and wiring technology at FRCE. “This laser ablation system basically cooks and bakes off all the organic substances of the paint, so the only thing that is removed are the heavy metals that are not converted into carbon dioxide or water vapor.”
The laser ablation system sends nanosecond-length pulses of light onto the surface to be cleaned. When the contaminants absorb the light, they either turn into a gas, or the pressure removes particles from the surface, leaving the bare metal clean and ready for coating without damaging its structural integrity. In addition, any waste that is generated is pulled into a vacuum with a high efficiency particulate air (HEPA) filter, which makes laser ablation an environmentally friendly cleaning method.
“Any time you have plastic media blasting or some of these other processes, the waste that’s produced is considered hazardous waste,” Templeton said. It’s very expensive to remove and to dispose of. With this process, the only hazmat that you have to deal with is the filter and the media that’s collected into the HEPA filter. There’s a whole lot less waste, and it’s a whole lot safer for the environment, a whole lot cheaper for our facility—just benefits all around.”
Demonstration Feedback
During the demonstration, several groups of maintenance staff, engineers, and beyond, donned laser safety glasses to watch as representatives of Adapt Laser stripped paint from a large aircraft engine can. Volunteers, many of them dressed for the office, carefully passed the 1,000-watt laser unit over the storage container, removing swaths of paint from the metal. Participants remarked that the laser system was cleaner, quieter, and less cumbersome than plastic media blasting methods, which would make it safer for artisans to operate.
“If we were to do something like laser ablation, we would remove the artisan from those hazardous environments,” said Steven Lofy, materials engineer. “Before, it’s a process that’s going to take longer. You have your chemicals and blast media, you’re not as precise, you have ergonomic injuries from repetitive motions. With the laser, all you have to do is bring in safety glasses.”
Artisans say the laser system is much quieter than abrasive blasting, which will make the process safer for employees’ hearing than current cleaning methods .“Right now, you can’t be understood when you’re blasting,” said Chad Richards, aircraft examiner. “With laser ablation, you can have someone right beside you talking.
Personnel from FRCE’s packaging and preservation shop were the first to try the laser ablation system, and they gave it high marks for efficiency, safety, and cost-effectiveness. “Right now, given the maintenance for the blasting booth that we have, this will save money all the way around,” said Bridget Wilkins, production supervisor. “It will save a lot in blasting material, paying for the hazmat, removal of the material and the maintenance on the machine itself. So I think it’s an excellent way to go, and I would really hope we consider it.”
Starting Small
If the laser ablation technology is adopted at FRCE, the plan would be to start small.
“The first step would be getting one of these handheld systems for use in the packaging and preservation shop to use on engine cans, possibly on some ground support equipment, and then plan to move forward once the research is complete,” said Templeton. “At that point, we would start working on components, work up to the next step — maybe unmanned aerial vehicles — then work toward our final goal, which would be to clean a full aircraft using a robotic laser ablation system.”
With all of its benefits, the laser ablation system is expensive; handheld units cost between $400,000 and $500,000. FRCE engineers say they expect the system would pay for itself in the long run, with reduced costs for purchase and disposal of hazardous materials, as well as the benefits of quicker turnaround time, improved worker safety and decreased environmental hazards.
The next step for the ATI team is to develop a cost benefit analysis that would lead to procurement of the handheld laser ablation system. To that point, team members say the demonstration was a positive step toward adopting the laser ablation technology.
“I think it was a perfect 10,” Templeton said. “We had various different groups come down, we had leadership, we had various artisans, we had Marines come in, we had Coast Guard guys, and everybody had great feedback for us. Some people walked out of here wanting to buy a system that day, if that tells you anything about how well it was received. I think we’re on the right track to help everybody out and move forward with this project.”
Source: U.S. Defense Video Imagery Distribution System, www.dvidshub.net.
Reference
1 “FRCE Explores New Technology: Using Lasers to Remove Corrosion and Coatings from Metallic Components,” Defense Visual Information Distribution Service News, Dec. 16, 2020, https://www.dvidshub.net/news/385118/frce-explores-new-technology-using-lasers-remove-corrosion-and-coatings-metallic-components (Jan. 20, 2021).