Upsetting test at wires to the testing on surface defects
The upsetting test at cold upsetting steels and cold extrusion steels is described in the DIN EN 10263 (formerly DIN 1654). For the test, blank specimens, in the length of 1.5 x diameters, are cut from the material (wire or steel bars) which has to be checked. The test pieces become upsetted under the upsetting press in the ratio of 1:3. Depending on material and arrangement, upsetting reduction ratios of 1:2 or 1:4 are also possible. In the area of surface defects the samples burst at the surface. The strength of the burst is dependent on the upsetting reduction ratio, the material and its heat treatment condition, the defect depth and the defect type.
