利用双丝埋孤焊接试验,对比分析了传统DH36钢和大线能量焊接DH36船板钢焊接热影响区的组织与性能.结果表明,利用新型的Ti处理技术生产的大线能量DH36钢母材具有良好的强韧性和大线能量焊接性.经大线能量(100kJ/cm)焊接后,传统DH36钢焊接热影响区低温韧性显著降低,不能满足指标要求(34 J).大线能量DH36船板钢在50 kJ/cm和100 kJ/cm热输入焊接时均表现出良好的低温韧性,-20℃冲击功大于100 J.同传统的DH36钢相比,大线能量DH36钢焊接接头出现了软化区,但接头强度并未显著下降.总体上大线能量焊接DH36钢优越性在于:大线能量焊接时,焊接热影响区主要得到大量交错排列的晶内针状铁素体组织,热影响区硬度降低,低温韧性显著提高.
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