The fracture surface of specimens with low Si content is mainly quasi-cleavage, and its crack propagation energy is better than the specimens with high Si content.

• 低硅氩弧焊熔敷金属低温冲击断裂形貌以准解理为主，裂纹扩展功高于断裂形貌主要为解理的高硅含量熔敷金属；