Charpy Impact Testing
Charpy Impact Testing
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Charpy Impact Testing measures the amount of energy absorbed during fracture of a specimen to determine its Ductile to Brittle Transition Temperature (DBTT), which can be graphed in our report. Testing includes sample preparation of three specimens per test and is used primarily for steels which exhibit temperature dependent behavior relating to toughness of the material at high strain. This toughness is typically related to direction of the rolling or grain flow of a forging. Materials are usually tougher along the direction of rolling and not as tough across the direction of rolling.
This type of testing is often specified in welding codes for pressure vessels, valves and fittings used in the oil and gas industry, related piping, pipelines, outdoor structures, hi-rise buildings, towers, bridges, agricultural vehicles, industrial equipment, and other critical building, infrastructure, and engineering applications.
At QAI, we take pride in offering timely and personalized customer services alongside our rigorous mechanical testing. Our independent, accredited mechanical test lab ensures that Charpy Impact Testing is conducted daily, adhering to ASTM A370/E23 standards. With our two high capacity pendulum impact testers and cutting-edge sample preparation methods, we guarantee accurate results regardless of part size or hardness. Moreover, our 16 cutting machines, ranging from high-speed diamond saws to a substantial double column band saw, enable us to accommodate various materials and dimensions with ease. It can cut 40″ by 40″ part.
Experience the difference of our dedicated approach, where timely results and tailored assistance are at the forefront of our commitment to excellence.
Specimens needed for Charpy Impact Testing are normally cut from the actual part or weldments using an abrasive cut off saw or a band saw with low heat input. Base metal specimen is 55 mm (about 2.25″ inches) in length, 10 mm thick and 10 mm wide.
Centerline of the Charpy specimen is notched according to standard with a special broach to create the required V-Notch with the appropriate dimensions and surface finish. Sub-size specimens can be made with 7.5 mm x 10 mm or 5 mm x 10 mm or 2.5 mm x 10 mm. Threaded fasteners and pipe have special considerations. Specimens are tested either at room temperature or at a specified temperature, such as -20ºC, -10ºC, 0ºC, +10ºC, +20ºC.
METAL AND METALLIC COMPONENTS
Notched Bar Impact (Charpy Full Size and Sub-Size Samples)
ASTM E23
Charpy Pendulum Impact Tester
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Founded in 1995 by a group of experienced certification and testing experts, QAI is an independent third-party testing, inspection and certification organization which serves the building industry, government and individuals with cost effective solutions through our global, in-house capabilities / services.
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