According to GB/T 21143-2014 standard,CTOD tests were carried out on the weld zone and HAZ of N610CF steel welded joint under different welding speeds of double wire submerged arc welding(v1=60 cm/min,v2=70 cm/min,v3=80 cm/min),and the fracture morphology and microstructure were analyzed.The results showed that the average CTOD of the HAZ and weld zone obtained by using single wire submerged arc welding for bottoming and tandem double wire submerged arc welding with welding speed v1=60 cm/min to fill and cover the surface was 0.683 mm,the dispersion coefficient was 9.6％,and the comprehensive fracture toughness was the best.
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