CAP1400核电站钢制安全壳焊后热处理

摘要

基于ASME锅炉及压力容器规范第Ⅲ卷第1册NE分卷对焊后热处理的规定,结合CAP1400钢制安全壳结构形式、材质要求,确定需进行焊后热处理的焊缝范围.结合工程建造特点,对贯穿件套筒与补强板焊缝进行炉内整体热处理,筒体纵焊缝、环焊缝、补强板与筒体焊缝进行局部焊后热处理.为控制焊后热处理的变形,筒体纵焊缝采用单条或多条对称加热、筒体环焊缝及设备闸门补强板焊缝采用分段加热方式,通过试验确定局部焊后热处理的加热带宽度、隔热带宽度和厚度;保证均温带温度达到595℃～620 ℃的设计要求.%The weld range specified for post weld heat treatment(PWHT) was determined based on the related requirement of ASME Section Ⅲ,Division l,Subsection NE,and especially on the structural style and material requirement.Considering the features of the construction,furnace heat treatment applies to joint between penetration sleeve and reinforcement plates.Local PWHT shall be used for longitudinal weld,circumferential weld,as well as the joint between reinforcement plates and CV ring weld.To avoid welding distortion,adopted the method of heating symmetrically for single or multiple longitudinal weld,and segment heating for circumferential weld as well as reinforcement p late weld in equipment hatch.The width of the heating zone,the width and thickness of the insulating zone are determined by experiments,to ensure all temperate temperature of 595 ℃ ～ 620 ℃,meeting design requirements.