Testing and Measuring Articles

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JD Power problem ratings

The problem with quality

July 10, 2003 | By Bernard Swiecki

In May, automotive quality gurus J.D. Power & Associates released the results of its 2003 Initial Quality Study (IQS). As is the case every year, the winners will trumpet their scores while the losers will promise improvement. A closer look at the numbers, however, reveals some interesting observations.

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Understanding weld discontinuities

June 12, 2003 | By Tony Anderson

A welder's primary concern in any kind of work is ensuring his weld is sound. For this reason, it's important for an inspector examining the weld to be able to spot a variety of weld discontinuities, including:Porosity.Incomplete fusion.Incomplete joint penetration.Unacceptable weld...

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In-service weld defects, Repair, replace, or do nothing?

December 12, 2002 | By Roger Griffiths

Editor's Notes: In-service weld defects found in Australian refineries by an inspection team required assessment to determine the best course of action - repair, replace, or do nothing. This is the author's first-person account of the team's findings and solutions.The post-World War II period to...

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Quality as Part of the Contract

October 24, 2002 | By Jesse A. Grantham

Leaders who oversee weld designs, materials, methods, personnel training, and manufacturing teams should promote welding performance by addressing quality and testing issues in contracts for any work. Total quality systems and weld acceptance criteria must be specific--specified for each contract--and adherence must be enforced without wavering. Acceptance criteria for welding should be agreed to in a face-to-face meeting before fabrication begins. Before a project begins, all parties should agree on the retention time for inspection and test records—including X-rays, personnel qualifications and other project data--and the contract should state the location and description of the records storage facility.

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Some 'near-jig' ideas

July 25, 2002 | By Gerald Davis

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 | By Jean-Charles Granger

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 | By Janez Tusek

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 | By Tony Anderson

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 | By Tony Anderson

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 | By Tony Anderson

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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Ultrasonic instrument figure 1

Using NDT systems to monitor welded tube production

November 15, 2001 | By Donald N. Bugden

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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Rockwell hardness and Brinell testing of tube and pipe

November 15, 2001 | By Edward Tobolski

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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Monitoring the quality of welded tube and pipe

September 17, 2001 | By Brian Roberts

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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