Crack-starter weld bead deposition for ASTM E 208 drop-weight testing - Part 1: qualification of electrodes for the crack-starter bead on P-2 type drop-weight specimens - ASTM E 208-95a

摘要

Nine electrodes were qualified for use as Crack-Starter Beads at temperatures below 112°F (44℃) in accordance with ASTM E 208-95a on two strength level steels (SA 537 Class 1 and SA 517 Grade F): Murex Hardex N, McKay DWT, Lincoln Wearshield MM, Conarco Conarcrom 350, Esab Selectrode OK 83.30, Esab Selectrode OK 83.50, Bohler FoxDur 350, Bohier FoxDur 500 and Kobe Steel NRL-S. The electrodes were also characterized as to operability. Recommendations are suggested as to the proper fixturing and methodology for welding the Drop-Weight samples. The NDT Temperature was determined for both the SA 537 Class 1 and 5A517 Grade F materials with variation of the Crack-Starter Bead energy input and bead width consistent with good operability of the electrodes. Except for an anomalous behavior with one set of samples welded with the Lincoln Wearshield MM electrode, no significant differences were apparent in the NDT Temperatures measured when the energy input and Crack-Starter Bead width was varied.