In-Line Weld Penetration Monitor Using Laser Ultrasonics

Award Information
Agency: Department of Defense
Branch: Navy
Contract: N65538-10-M-0112
Agency Tracking Number: N093-210-0739
Amount: $69,997.00
Phase: Phase I
Program: SBIR
Awards Year: 2010
Solicitation Year: 2009
Solicitation Topic Code: N093-210
Solicitation Number: 2009.3
Small Business Information
2520 W. 237th Street, Torrance, CA, 90505
DUNS: 033449757
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Marvin Klein
 Manager, Laser Ultrasonic
 (424) 263-6361
Business Contact
 Lothar Kempen
Title: Vice President, R&D
Phone: (424) 263-6362
Research Institution
Submerged arc welding is commonly used for joining thick plates in panel-line assembly. This technique normally involves double-sided welding, with significant preparation on the back side to promote adequate weld penetration. Currently, completed welds are inspected by ultrasonic or radiographic techniques after a delay to allow cooling. If incomplete penetration is detected, the flawed region is likely to be extensive, and considerable repair or rework is required. In this proposal we will demonstrate the feasibility of monitoring submerged arc weld penetration in real time, immediately after the weld is formed. Such an in-line technique would eliminate slow, costly post-process inspection and would allow immediate corrective action if a bad weld is detected. The technique we will apply is laser ultrasonics. The use of lasers for generating and detecting ultrasonic waves enables inspection on parts with rough surfaces that can be moving and/or at high temperature. In this project we will establish the best inspection configuration and test welds and analyze shipyard affordability.

* Information listed above is at the time of submission. *

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