Charpy impact test
The notched bar impact test checks the resistance of metal specimens to brittle fracture under shock loading by a sudden blow with a pendulum hammer. This test is especially relevant for steel types to determine their mechanical properties.
Physical-Chemical Mechanism of Action
The Charpy impact test simulates a sudden load by striking the specimen with a pendulum hammer. This test checks how well the metal specimen behaves under this specific load and whether it fails in a brittle manner.
Metallurgical Relevance & Welding Risks
If mechanical properties are poor, the metal can fail brittly or develop cracks. This is especially dangerous in critical components, as it can lead to safety issues.
Shop Practice & Instructions
For the Charpy impact test, a metal specimen is struck with a pendulum hammer. The number of blows and the load must be precisely defined. Failure under 10 blows indicates poor mechanical properties and may require re-manufacturing or altering the metal.