NB/T 20002.3规定,热影响区冲击试样缺口轴线距熔合线1 mm处制取,对于重要的Mn Mo Ni调质钢制造的1级部件,还应在缺口轴线距熔合线4 mm处进行附加的试验。从大量冲击试验数据、相关标准和要求、热影响区的组织和性能特点3个方面进行分析,结果表明,核岛机械设备焊接工艺评定中冲击试验优化要求是合理的。 NB / T 20002.3 provides that the impact of heat affected zone impact notch notch axis 1mm away from the fusion line made for the important Mn Mo Ni quenched and tempered steel grade 1 components should also notch axis 4 mm from the weld line Additional test. The results show that it is reasonable to optimize the impact test in the assessment of welding process of nuclear island machinery and equipment from the aspects of a large amount of impact test data, relevant standards and requirements, the organization and performance characteristics of the heat affected zone.