Vibration Stability Investigations on Cruciform St 37 Steel K Welds . Schwingfestigkeits-Untersuchung an Kreuzstoessen MIT K-Naht Aus Dem Grundwerkstoff Stahl St 37

摘要

The results of statistically evaluated S-N tests and programmed fatigue tests are presented for a cruciform St37 steel K weld, produced in special quality (full penetration, dressed weld surface) and in normal quality (incomplete fusion, no dressing). The special quality specimens exhibit a high fatigue resistance. Fracture occurred outside the weld in the steel cross section, although an X-ray examination showed small weld defects. Analysis of the tests showed that small defects should be accepted. In normal quality specimen fracture starts at the root of penetration. In this case fatigue strength, depends on the degree of incomplete fusion.