ZwickRoell DWT high-energy drop weight testers are used to test and evaluate the fracture surfaces of ferritic steels; for instance, they are often used for oil and gas pipelines. The test method is described as a drop weight test in the following standards: API-RP 5L3, DIN EN 10274 and ASTM E436. During the drop, the weight accelerates a standardized test piece in the direction of the specimen that is being penetrated or broken. The type of break as well as the break structure of the specimen allow conclusions to be drawn about the material properties. The specimen can also optionally be tempered with a separate cooling unit.
Instrumented drop weight testers additionally offer the possibility to record complete force-travel diagrams from which the characteristic force points as well as the absorbed impact energy can be calculated. For testing notched steel specimens from pipe sections, the Essen-based testing laboratory, Gövert, purchased a ZwickRoell drop weight tester, type DWT120 kJ. A new hall was built specifically for the drop weight tester.