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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welded clock

Building a stronger welding program

June 7, 2010

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Bellingham Technical College launched its Welding Rodeo in 2002 to spur enrollment and raise its public profile. Now one of the premier welding competitions in the Pacific Northwest, the event has helped the school triple its enrollment in welding and expand its program/skill offerings.

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relieve stress welding

How to relieve stress in welding

November 2, 2009

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Relieving residual stress through welding technique as well as temperature control can greatly reduce weld distortion.

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Finding seemingly insignificant flaws Part II

July 17, 2009

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Eddy current testing does more than detect product defects. When used with a proper monitoring system on a mill staffed by highly trained operators, it can help to optimize the mill's efficiency. The first part of this two-part article covers eddy current system principles.

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inline eddy current testing

Finding seemingly insignificant flaws Part I

June 10, 2009

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Eddy current testing does more than detect product defects. When used with a proper monitoring system on a mill staffed by highly trained operators, it can help to optimize the mill's efficiency. The first part of this two-part article covers eddy current system principles

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testing digitalscale

Inspecting and verifying fillet weld size

May 19, 2009

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Woolf Aircraft Products Inc. developed an inspection tool that can beused to measure a leg length, as well as the actual throat of a weld.Using these two known measurements, quality assurance personnelthen can determine the actual size and the convexity and concavity ofa specific fillet weld.

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nondestructive testing infrastructure

Welding Update for Infrastructure: No nonsense with NDT

May 18, 2009

Infrastructure is defined as the basic physical systems that serve a community's population, such as roads, bridges, utilities, water, and sewage. These systems are essential for enabling productivity in the economy, so it is crucial to ensure they are fit for use. Nondestructive testing (NDT)...

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Automate Inspection System

Automated optimization of weld seams

April 28, 2009

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Automated vision inspection and optimization technology can help streamline manufacturing operations and improve part quality. This technology detects defects in welding seams that often are missed by manual inspection and provides documentation that can be used in researching and resolving product issues.

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Measuring Tape

Precision measurement 101

March 24, 2009

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It's more important than ever for your employees—particularly entry-level personnel—to learn to use measurement tools to their full potential.

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Stationary sensors

Eddy current testing strategies for copper tube

March 11, 2008

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If you are a copper tube producer, you know you need to use nondestructive testing methods, but you might not be aware of all the possibilities in how they are used. First off, should you check the material before or after it is processed? What are the advantages and disadvantages of each testing point? Should you test it at both places? And second, can testing do more than help you prevent shipping poor-quality product?

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Under pressure?

March 11, 2008

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Although it is used primarily for forming, hydroforming equipment also is useful in many pressure testing applications (burst testing, pressure pulsation, leak testing, autofrettage).

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Tube seam laser welding

Finding poor-diffusion bonds in ferrous, nonferrous tubes

December 11, 2007

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Determining whether a tube seam has a partial bond can be difficult with standard ultrasonic or eddy current techniques. However, multifrequency, probe-based eddy current equipment can detect poor-diffusion bonds in nonferrous materials. Using a penetrating field to reflect a signal off the planar structure of the weld works on ferrous materials.

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Pareto diagram figure 1

Measure it, graph it, control it

October 9, 2007

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Statistical process control (SPC) often is used to reduce the number of manufacturing defects. However, it has other uses also. It can serve to increase productivity and therefore improve a company's profitability. Statistical tools and Pareto diagrams can help you to track manufacturing problems and put you on the trail to finding their causes.

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Non-destructive Testing

Seeing the light with NDT

September 11, 2007

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A welding shop specializing in aerospace systems and parts adds nondestructive testing to its in-house capabilities to keep pace with inspection requirements and speed up part turnaround.

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Arc welding image

Quality inspections

July 10, 2007

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To ensure quality welds, it is important to have a quality weld inspection program in place. In order to do so, a company must understand how to evaluate weld characteristics, determine weld quality, and have a welding inspector capable of performing a number of different testing methods.

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Bend Process

Bend process monitoring—small changes lead to big results

June 12, 2007

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Conventional quality control in tube bending operations usually means detecting the number of links on a tube bending mandrel. When such a system detects that a mandrel link is missing, it shuts down the system so personnel can discard the last bent tube and replace the mandrel. Unfortunately, the broken mandrel link usually is a symptom of a larger problem—one that may have produced poor-quality parts long before the mandrel broke.Another method, process variation monitoring, measures the tension on the mandrel and alerts the equipment operator when the tension changes. This lets the manufacturing personnel know that a problem is developing while it is still small and manageable.

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