Sealant removal from a 10 center wing fuel tanks using a portable hand held nd yag laser system
This presentation is the property of its rightful owner.
Sponsored Links
1 / 13

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


  • 81 Views
  • Uploaded on
  • Presentation posted in: General

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

Download Presentation

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

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


  • Login