The Weld Cracking Susceptibility of High Hardness Armour Steel.
DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION CANBERRA (AUSTRALIA)
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The work detailed in this paper was performed to determine the likelihood of cracking during and after welding of 10 mm thick, high hardness, armour steel plate in conditions of high restraint. All welding was performed using the pulsed gas metal arc welding process in the flat position. High restraint conditions were tested using the Y-groove test. Welds were performed with ferritic, austenitic and duplex austenitic ferritic electrodes. Underbead cracking, a typical form of hydrogen induced cracking, was observed in the hardened region of the heat affected zone of ferritic welds where the heat input was 0.5 kJmm and the preheat was 750C or less. No cracking was observed at this heat input when the preheat was raised to 1500C. When the heat input was raised to 1.2 kJmm, no cracking was observed, even when preheat was not used. Underbead cracking was not observed in either austenitic or duplex welds. However, the duplex welds were found to be susceptible to weld metal solidification cracking when the heat input used was low, 0.5 kJmm. These cracks did not occur when the heat input was raised to 1.2 kJmm.
- Properties of Metals and Alloys