Abstract
Double blow impact tests were performed on V-noched Charpy specimens of deposited steels at temperatures, -70°C to 80°C, to divide the total energy absorbed by the standard impact test (Wc) into the energy for crack initiation (Wi) and the one for crack propagation (WD). Two ilmenite type electrodes (No. 1 and No. 4) and a low hydrogen type one (No. 9A) were used for the tests. The same experimental procedure for the rolled steel plat was adopted as previously mentioned in the author's report. The Figs. 2-4 show the test results.
From these figures, both the Wi-and the Wp-temperature curves were determined (Figs.5-7). The Wi curve of No. 9A was much higher in its maximum value and located at exceedingly lower temperature side than no. 1; on the other hand, Wp curves of both deposits showed no remarkable difference. By No. 4 deposit, less deoxidized than No. 1, either curve of Wi and Wp was located at higher temperature side than No. 1.
Those characteristics of energy curves were discussed in relation to the transition temperatures of welded joints investigated by the author.
