摘要
采用贴面式感应加热和缠绕式感应加热方法分别进行T91管座焊缝的焊后热处理,测定了不同感应加热方法的焊后热处理温度曲线,分析了温度分布特征。结果表明:由于贴面式感应加热时电磁抵消严重,致使要加热到设定温度所需要的电流急剧增大,超过设备额定电流,不适用于管座焊缝热处理;采用缠绕式感应加热时,小管上缠绕圈数越少,则上下管温差越小,当小管不缠绕电缆时,经过760℃保温20 min后,温度在750~760℃,可以获得良好的退火效果。不同升温速度对温度分布影响不大,因此可在满足设备使用的前提下,加快升温速度,缩短加热时间。为了应对电流突变现象,当加热温度达到700℃时,设定升温速度为200℃/h,加热至760℃,各点温差在10℃以内,加热效果良好。
The post weld heat treatment of T91 pipe seat weld was carried out by using veneer induction heating and winding induction heating,respectively.The temperature curves of post weld heat treatment using different induction heating methods were measured and the temperature distribution characteristics were analyzed.The results show that due to serious electromagnetic offset with veneer induction heating,the current required to heat to the set temperature increases sharply,exceeding the rated current of the equipment,and it is not suitable for pipe seat weld heat treatment.When winding induction heating is used,the smaller the number of winding coils on the small tube,the smaller the temperature difference between upper and lower tubes.When the number of winding coils on the small tube is 0,after insulation at 760℃for 20 min,the temperature is 750-760℃,and good annealing effect can be obtained.Different heating speeds have little effect on the temperature distribution.Therefore,on the premise of meeting the use of the equipment,the heating speed can be accelerated and the heating time can be shortened.In order to deal with the sudden change of the current,when the heating temperature reaches 700℃,set the heating speed of 200℃/h during heating to 760℃,the temperature difference of each point is within 10℃,and the heating effect is good.
作者
郭未昀
丁光柱
孙松涛
胡传华
梁浩
李报
王伟
GUO Weiyun;DING Guangzhu;SUN Songtao;HU Chuanhua;LIANG Hao;LI Bao;WANG Wei(Power China Henan Engineering Co.,Ltd.,Zhengzhou 450000,China)
出处
《热加工工艺》
北大核心
2025年第13期143-147,共5页
Hot Working Technology
基金
中国电力建设集团有限公司科技项目(DJ-TGYY-2017-10)。
关键词
T91钢管座
焊后热处理
贴面感应加热
缠绕式感应加热
T91 steel pipe seat
post weld heat treatment
veneer induction heating
winding induction heating
