Francis Jay Dodd

US Patent:

39330265, Jan 20, 1976

Filed:

Jul 31, 1974

Appl. No.:

5/493446

Inventors:

William C. Ham - Berkeley CA
Francis J. Dodd - Berkeley CA
Spencer J. Friedrick - Berkeley CA

International Classification:

G01N 2904

US Classification:

73 1R

Abstract:

A calibration standard for an ultrasonic inspection system used to test components having curved surfaces. Several embodiments are disclosed, all having at least one curved surface and a calibration hole providing an internal controlled geometry reflector surface having a body axis which conforms to the curvature of the surface. The several embodiments can be manufactured by several methods, one of which comprises securing a block of electrically conductive material having the desired curved surface in a fixture, placing a moveable electrically conductive electrode adjacent the block to form a gap therebetween, applying a high voltage to the block and the electrode to cause an electrical discharge across the gap while bathing the gap in a dielectric fluid, and advancing the electrode into the interior of the block along a curved path having a center of curvature common to the center of curvature of the curved surface to form an internal bore therein.

US Patent:

46779167, Jul 7, 1987

Filed:

Mar 4, 1985

Appl. No.:

6/708173

Inventors:

Francis J. Dodd - Lafayette CA

Assignee:

Nuclear Energy Systems, Inc. - Danbury CT

International Classification:

B61B 1304

US Classification:

104118

Abstract:

A guide and magnetically susceptible track for a weld scanner wherein a mild steel sheet metal track element is wrapped about a pipe with its end portions overlapping and the end portions are tightened together with clamp means while tabs engage notches at the opposite corners of the track element so that a guide element along the centerline of the track element is thereby self-aligned to provide a full 360. degree. track and guide.