| The effect of welding condition on mechanical properties and Hydrogen Induced Stress Corrosion Cracking (HISCC) resistance of Heat Affected Zone (HAZ) in high strength steel weldment was studied. Multi-pass Submerged Arc Welding of A5l6 Grade 70 steel plate with different heat input of 30, 40, 50 KJ/㎝ were carried out, which were followed by Post Weld Heat Treatment (PWHT) for 2 hrs at 630 ℃. As the heat input during welding was increased, the impact energy and hardness at HAZ were decreased, on the other hand, the hardness was decreased and both the impact energy and the resistance of HISCC were increased. With proper selection of welding heat input and PWHT, better results of the resistance of HISCC and Charpy V notch impact energy of HAZ can be obtained. |
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