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用卸载柔度单试样法ＣＯＤ阻力曲线自动测试技术，测定了ＣＯ２气体保护焊药芯焊丝ＹＪ５０１焊缝金属在室温和－２０℃时的ＣＯＤ阻力曲线，并对焊缝金属的显微组织进行了电镜分析．结果表明：ＣＯ２气体保护焊ＹＪ５０１药芯焊丝焊缝金属在室温和－２０℃均有较高的断裂韧性，焊缝金属中含有一定量的针状铁素体是其具有较高断裂韧性的主要原因
The COD resistance curves of CO2 gas shielded flux cored wire YJ501 weld metal at room temperature and -20 ℃ were measured with the unloading softness single sample method COD resistance curve automatic test technology and the microstructure of weld metal was analyzed Electron microscopy analysis. The results show that the weld metal of YJ501 flux cored wire of CO2 gas shielded welding has higher fracture toughness at room temperature and -20 ℃. The weld metal contains a certain amount of acicular ferrite which is the main fracture toughness the reason