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Rockwell Standard Revealed

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The long awaited ASTM E18-07 Rockwell Hardness Standard has been released. While it is technically similar to the older version, some changes affect both users and service providers.

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Quality 101: Nondestructive Testing

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Nondestructive testing (NDT), or nondestructive evaluation (NDE), is a method of materials testing that assesses the characteristics of a component without altering or destroying it.

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NDT Gets Better

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In the past decade there have been tremendous strides in technological advances related to nondestructive testing (NDT). From ultrasonic phased array to digital radiography, technology has given the NDT technician improved capabilities.

In the past, many of the limitations associated with various NDT methods had to do with the available equipment. Today, with advances in computer processing and the availability of smaller, more powerful digital systems, NDT is a powerful tool. As there have been many technological advances in various methods, here we will focus on just two areas: radiography and ultrasonics.

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Digital Radiography Replaces Film

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The digital revolution that occurred in both amateur and professional photography was the direct result of increased recognition that—for most applications—digital works better. Digital radiography (DR) experienced similar rapid growth in clinical use and has spilled over into the nondestructive testing (NDT) arena. While DR technology has been in use for some time, recognition of its merits is somewhat lacking among the NDT film radiography community. There are several types of DR, but the two most commonly used in NDT are computed radiography (CR) and digital detector array radiography (DDA).
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Advance NDT Techniques

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AC-FM - Alternating Current Field Measurement

This is a non-contacting electromagnetic technique which is used as a surface defect detection alternative to magnetic particle and dye penetrant inspections in conducting materials. A uniform electric current is induced into the material to be inspected which produces a magnetic field which in turn will be disturbed and flow around the edges of a defect if present. The probes are constructed in order to detect these magnetic field disturbances. Software algorithms allow an estimate of crack depth and crack length to be obtained.

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