Ultrasonic testing device for weld seams in pipes, sheets and containers

US5677490A · kind A · utility

Assignee

• F. H. Gottfeld Gesellschaft fur Zerstorungsfreie Werkstoffprufung mbH · DE

Inventors

• Werner Gunther · Bensheim, DE
• Bernhard Karbach · Lechenich, DE
• Helmut Heckhauser · Herne, DE
• Siegmar Schulz · Cologne, DE

Key dates

• Filing date: Aug 18, 1996
• Grant date: Oct 14, 1997
• Expiry date: Aug 18, 2016

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N2291/2675
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

The ultrasonic testing device for weld seams (28) in pipes, sheets and containers, preferably for circumferential welds in pipelines, is fitted with two identical test head supports (20), each fitted with at least one test head (e.g., 23), arranged in lateral inversion to the weld seam, which acoustically irradiate from the basic material (30) of the pipes or sheets laterally into the weld seam (28) and are coupled to the surface of the basic material (30) opposite the root (32) of the weld seam (28). Each test head support (20) has a plurality of immersion test heads (22-24) arranged one behind the other or side-by-side transversely to the weld seam (28) in such a way that their acoustic irradiation entry regions into the basic material (30) are as close together as possible and of which a) one immersion test head (22) is directed so that it generated a creeping wave in the basic material (30) on the side of the root (36) of the weld seam (28) which spreads out at the surface and of which b) at least two other immersion test heads (23, 24) irradiate at a flatter angle than the first-mentioned head (22) for longitudinal fault testing, and one of these immersion test heads (23) for …