Abstract
Effects of the conditions of welding procedure on the weld crack sensitivity of 13Cr cast steels were investigated by the tensile restraint cracking (TRC) test and the slit type cracking test, using D 4316 type and D 410 type of coated electrodes. The main results are summarized as follows.
(1) The critical tesile stress for cracking occurence increased with increase of preheating temperature. When 13Cr cast steels and low alloy high tensile steels were compared with, increase in the critical stress of 13Cr cast steels due to the rise of preheating temperature was small. (2) When the holding temperature after welding was higher than 100°C, the critical stress increased. At 150°C holding temperature, a large increase of the critical stress was observed in a relatively short period of holding time.
(3) When 13Cr weld specimens were postheated within the range of 400-600°C, the critical stress was more than 46 kg/mm2 (Fractured in D 4316 weld metal).
