Abstract
In the previous study, the welding condition for preventing the transverse weld cracking in submerged-arc welding of HT-80 were determined.In the present study, y-groove cracking tests were employed for determining the root cracking condition.The root cracking characteristics depend on the PCM of base metal or weld metal, whichever is higher, diffusible hydrogen content of weld metal and cooling time of weldment.The critical conditions to prevent the transverse cracking are severer than the ones to prevent the root cracking. It is concluded, therefore, that an adoption of the welding conditions to prevent the transverse cracking generally guarantees both the root and the transverse crack-free weldments in submergedarc welding of HT-80 steels.
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