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.
June 12, 2003
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...
December 12, 2002
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...
October 24, 2002
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.
July 25, 2002
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.
March 14, 2002
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.
February 14, 2002
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.
January 24, 2002
Many aspects of welded component design and fabrication are governed by documents known as codes and standards.
November 15, 2001
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.
November 15, 2001
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.
September 17, 2001
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.