sealant removal from a 10 center wing fuel tanks using a portable hand held nd yag laser system
Download
Skip this Video
Download Presentation
Sealant Removal from A-10 Center Wing Fuel Tanks Using a Portable Hand-Held Nd: YAG Laser System

Loading in 2 Seconds...

play fullscreen
1 / 13

Sealant Removal from A-10 Center Wing Fuel Tanks Using a Portable Hand-Held Nd: YAG Laser System - PowerPoint PPT Presentation


  • 151 Views
  • Uploaded on

Sealant Removal from A-10 Center Wing Fuel Tanks Using a Portable Hand-Held Nd: YAG Laser System. Norman J. Olson Pacific Northwest National Laboratory Richland, Washington 99352 Mitchell Wool General Lasertronics Corporation San Jose, California 95112. 2005 CTMA Symposium – Tacoma, WA

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' Sealant Removal from A-10 Center Wing Fuel Tanks Using a Portable Hand-Held Nd: YAG Laser System' - akiko


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
sealant removal from a 10 center wing fuel tanks using a portable hand held nd yag laser system

Sealant Removal from A-10 Center Wing Fuel Tanks Using a Portable Hand-Held Nd: YAG Laser System

Norman J. Olson

Pacific Northwest National Laboratory

Richland, Washington 99352

Mitchell Wool

General Lasertronics Corporation

San Jose, California 95112

2005 CTMA Symposium – Tacoma, WA

April 18-21, 2005

the problem
The Problem
  • > 300 A-10 Aircraft in Service
  • Center Wing Fuel Tank Cells Have Fasteners Covered with Sealant (Primer Coating Elsewhere)
  • Sealant in Fuel Tanks Needs to be Removed for NDE and/or Repair
  • Sealant Removal from Center Wing Tanks is Tedious and Expensive
  • Need a Less-Expensive, Faster Alternative

2

the problem1
The Problem
  • Current Technology is Hand Scraping
    • Difficult and Slow
    • Incomplete Cleaning is Highly Likely
    • Damage to Substrate is Likely
  • Laser Coating Removal
    • Offers Potential
    • Minimal Experience in Confined Spaces
    • Many Unanswered Questions

3

demonstration objectives and requirements
Demonstration Objectives and Requirements
  • A portable Nd: YAG laser that can remove sealant more economically than current methods,
  • A hand-held delivery system that is capable of removing all sealant in the center wing section,
  • A hand-held delivery system that is easy and safe to use,
  • A system that has the potential to remove only sealant and not primer (color recognition), and
  • A system that has reasonable reliability so that it will be operational for long periods of time without maintenance.

4

target for demonstration
Target for Demonstration
  • A-10 SPO Sent Retired Center Wing Fuel Tank Section to General Lasertronics Corporation Facilities in San Jose, CA
  • Demo Wing Section Had Eight (8) Access Ports to Fuel Cells
  • There Were Approximately 600 Fasteners Covered with Sealant in Each of the Eight (8) Fuel Cells
  • Access Ports Barely Large Enough for Operator

Cell

Opening

5

attributes needed to meet requirements for a 10 center wing tank
Attributes Needed to Meet Requirements for A-10 Center Wing Tank
  • Portability and reliability – DP Nd: YAG laser
  • Compact hand-held end effector that can operate in confined space – GLC SBIR design
  • Ability to see target area even if there are obstacles in line of sight
  • Meet laser safety and environmental issues
  • TWO-dimensional automated beam scanning to eliminate substrate damage potential and to ensure complete and systematic coating removal
  • Color recognition – potential to selectively remove sealant without disturbing other coatings

6

200 and 500 watt demonstrations using glc developed systems
200 and 500 Watt Demonstrations Using GLC-Developed Systems
  • 200 watt , 13 kHz, Nd: YAG Lamp-Pumped, Q-Switched System was Used for the Demo Conducted 9/21/2004
    • US Laser 406Q laser
  • 500 watt, 10 kHz, Nd: YAG, Diode-Pumped, Q-Switched System was Used for the Demo Conducted 12/9-10/2004
    • Cutting Edge Optronics Laser: Northrop-Grumman
  • Operator Uses Video Display if Line-of-Sight Obstructions Exist

7

glc confined space tool for laser coating removal
GLC Confined Space Tool for Laser Coating Removal
  • End Effector Consists of:
    • Laser Aperture
    • Two-Dimensional Scanning
    • 25 cfm Air Blow from Aperture
      • Cooling
      • Clear Work Area
    • Video Camera
    • Optical Fiber Umbilical
  • Cell Waste Evacuation
    • Separate 300 CFM Purge
    • Remove Ablated Debris
    • Remove Sealant Vapors
    • Maintain Good Visibility

Camera

8

demonstration results
Demonstration Results
  • Sealant Removed from Equivalent Fastener
    • 200 watt in ~ 1 Minute
    • 500 watt in < ½ Minute
  • Estimate of Labor for Entire Center Wing Fuel Tank
    • GLC Laser Tool Using the 500 watt SystemOne 8 Hour Shift
  • Conventional Scraping
    • Has never been fully completed
    • >> 800 work hours

24 Equivalent

Fasteners

9

demonstration results1
Demonstration Results
  • Color Recognition Potential Demonstrated on Automated System to Remove Coatings from Other Aircraft
  • Color Recognition Previously Demonstrated with a GLC Hand-Held Delivery Tool

10

demonstration objectives met
Demonstration Objectives Met
  • A portable Nd: YAG laser can easily remove sealant more economically than current scraping methods
  • A hand-held delivery system could be configured to remove all sealant in the center wing section
  • With minimal operator training, a hand-held laser delivery system is easy and safe to use
  • The system could be configured to remove only sealant and not primer by implementing existing color-dependent sensing technology and automated laser firing controls
  • The system has reasonable reliability so that it will be operational for long periods of time without maintenance.

11

safety
Safety
  • Requirements
    • Filtered (Clear) Glasses Worn by Operators
    • Work Area Secured the Same as a Welding Area
    • No Other Personal Protective Equipment Needed
  • Recommendations
    • Two Operators in Work Area
      • Improve Productivity by Maximizing Trigger Time
      • Keep Work Area Clear of Unauthorized Personnel
    • Could Enclose Work Area with Filtered Glass

12

recommendation for ncms ctma project
Recommendation for NCMS/CTMA Project
  • Implement System at Hill AFB
    • Build hand-held laser system for test, evaluation, and subsequent installation
    • Develop laser system operating parameters to ensure sealant removal without 2024-T3 Al substrate damage
      • Systematic exposure over a range of laser conditions
      • Collect metallographic and SEM information and relate to mechanical test data over statistically significant data sets
    • Develop end-effector attachments for easier access to all fasteners within A-10
  • Project Funding ~ $1500K, including cost-sharing

13

ad