Testing and Measuring Articles

Whether you need to measure dimensions or perform some sort of flaw detection on sheet, tube, or pipe, you'll find what you need in this technology area. It discusses measuring coordinates, diameters, and hardnesses; flaw detection using eddy current, ultrasonic, radiographic, and X-ray systems; and using a few other equipment types, such as vision systems and material composition analyzers.

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Aluminum bend test picture

Preparing, testing bend samples

September 26, 2002

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Bend tests for aluminum are different than for steel. For instance, lack of fusion discontinuities in aluminum usually don't show up as well in radiographs. A bend test is a more discriminating way to test your aluminum weld.

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Some 'near-jig' ideas

July 25, 2002

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In-process sampling and between-process checks can prevent problems at the production stage. Although using an inspection jig can be costly, some testing approaches that are not as rigorous as using an inspection jig are: stacking and blocking a sheared batch in order to scan the batch for variations; weighing castings; touring a customer's facility; and doing small batch inspections.

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Technology modernizes CMMs

July 11, 2002

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Coordinate measuring machines have progressed since their inception in the 1970s.

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Electromagnetic force diagram

Will your weld hold up? Discovering and preventing incomplete fusion

March 14, 2002

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This article examines the common weld defect known as incomplete fusion. It takes an in-depth look at the causes of this problem, how it is detected, and how to prevent it.

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Inspection Connection: Radiographic and ultrasonic weld inspection

February 14, 2002

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This article outlines the differences in radiographic and ultrasonic weld inspection, the two most common methods if nondestructive testing. It gives an overview of both methods, including how they are used.

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What welding inspectors should know about welding codes and standards

January 24, 2002

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Many aspects of welded component design and fabrication are governed by documents known as codes and standards.

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Radiographic and ultrasonic weld inspection

December 13, 2001

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This article outlines the differences in radiographic and ultrasonic weld inspection, the two most common methods if nondestructive testing. It gives an overview of both methods, including how they are used.

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Rockwell hardness and Brinell testing of tube and pipe

November 15, 2001

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The article discusses special considerations that must be kept in mind when hardness testing tube and pipe. Rockwell and Brinell are covered. Special considerations include surface finish, wall thickness, deflection, and internal supports.

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Ultrasonic instrument figure 1

Using NDT systems to monitor welded tube production

November 15, 2001

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This article discusses the capabilities and limitations of the two most common online tube monitoring test methods -- eddy current and ultrasonic. It discusses the types of flaws that each is capable of detecting, and shows photographs of three typical flaws -- one that was detected by ultrasonic, one by eddy current, and one by both. It concludes by showing that both methods should be used to provide the most comprehensive testing of welded tube.

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Monitoring the quality of welded tube and pipe

September 17, 2001

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An eddy current flaw detection system is suitable for detecting discontinuities in tube and pipe during the production process. Understanding about eddy current system principles and this technology's capabilities and limitations can help tube and pipe producers learn how to use such a system.

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