P91 welding process for main steam pipeline of high-temperature gas cooled reactor nuclear power station

The invention discloses a P91 welding process for a main steam pipeline of a high-temperature gas cooled reactor nuclear power station. The P91 welding process mainly comprises the steps of preparation before welding, preheating of a welding part, welding of the part, martensite transformation after welding and heat treatment after welding. According to the P91 welding process for the main steam pipeline of the high-temperature gas cooled reactor nuclear power station, the weld appearance and nondestructive testing quality can be improved, the impact toughness and the hardness performance of a welding joint are improved, finally the safety of the main steam pipeline is improved, and the service life of the main steam pipeline is prolonged. 本发明公开了一种高温气冷堆核电站主蒸汽管道P91焊接工艺，主要包括焊前准备、焊接部件预热、部件焊接、焊后马氏体转变、焊后热处理组成，本发明的主蒸汽管道P91焊接工艺能够提高焊缝外观和无损检测质量，并改善焊接接头的冲击韧性和硬度性能，最终提高主蒸汽管道安全性和使用寿命。