接头焊缝金属的断裂韧度显著低于母材，而热影响区断裂韧度则介于母材和焊缝金属之间。
The fracture toughness of the weld metal is lower than that of the base metal and the fracture toughness of heat-affected zone (HAZ) is intervenient between those of weld metal and base metal.
接头焊缝金属的断裂韧度显著低于母材，而热影响区断裂韧度则介于母材和焊缝金属之间。
The fracture toughness of the weld metal is lower than that of the base metal and the fracture toughness of heat-affected zone (HAZ) is intervenient between those of weld metal and base metal.
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