What is this standard about?
This is the third in a three part standard on the mechanical testing of metals to test their toughness using the Charpy impact test.
The first part outlines the test method. The second covers how to verify testing machines, and this third part, how to prepare Charpy V-notch test pieces for indirect verification of pendulum impact machines.
Who is this standard for?
The Charpy impact test is applied in a very wide range of industries. This standard will be used by metallic material manufacturers, purchasers and testers in those industries.
Why should you use this standard?
It can happen that two machines evaluated by direct-verification procedures give significantly different impact values when testing test pieces of the same material. Since this difference can lead to commercial disagreements, some purchasers of materials require that all pendulum impact testing machines are indirectly verified by testing reference test pieces supplies by them. This part of ISO 148 specifies the requirements, preparation and methods for qualifying test pieces used for indirect verification of pendulum impact testing machines in accordance with Part 2.
It specifies notched test pieces with nominal dimensions identical to those specified in Part 1, however the tolerances are more stringent.
What’s changed since the last update?
The standard was systematically reviewed by technical experts to ensure its continued market relevance. This standard is a technical revision of the 2008 version which has been withdrawn.