The paper analyses the possibility of post weld heat treatment (PWHT) quality assessment with the help of magnetoacoustic emission (MAE) signal measurements. Two welded superheater tubes, made of high chromium VM12 steel, were analysed—as welded and heat treated one. The analysed sample in the as welded state exhibited significantly higher hardness, accompanied by a big difference in the MAE signal intensity (of order of about 50%). In order to explain that, the influence of tempering on the MAE signal intensity is demonstrated for the very similar X20CrMoV12.1 steel. It is shown that the observed increase of the MAE intensity as a function of annealing time is directly correlated with the change in hardness. The as described dependence allows to propose a method based on the MAE signal measurements as a new tool for the PWHT assessment.

本文借助磁声发射（MAE）信号测量分析了焊后热处理（PWHT）质量评估的可能性。分析了由高铬VM12钢制成的两根焊接的过热器管，将它们进行了焊接和热处理。处于焊接状态的分析样品显示出明显更高的硬度，同时MAE信号强度也相差很大（约为50％）。为了说明这一点，对于非常相似的X20CrMoV12.1钢，证明了回火对MAE信号强度的影响。结果表明，观察到的MAE强度随退火时间的增加与硬度的变化直接相关。所描述的依赖性允许提出一种基于MAE信号测量的方法，作为用于PWHT评估的新工具。