核岛机械设备焊接工艺评定中冲击试验优化要求分析

Analysis of Optimization Requirements of Impact Test in Welding Procedure Qualification for Mechanical Components of Nuclear Islands

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。

There is a requirement in standard NB/T 20002.3, for class 1 components in MnMoNi quenched and tempered steels, additional test specimens shall taken with a notch at 4ram from the fusion line. The paper analyzes it from three aspects of large impact test data, relevant standards and requirements, and organizations and performance characteristics in the HAZ. The results indicate that the optimization requirements of impact test in the welding procedure qualification for mechanical components of nuclear islands are reasonable.