CAJ | 학술논문

主管道在核电站安全中起着至关重要的作用，主管道焊接质量也显得尤为重要。在目前核电机组主管道焊接中，窄间隙自动焊逐渐取代了传统的手工焊，提高了焊接效率。但由于主管道窄间隙自动焊采用单层单道焊接工艺，如果控制不好，容易出现未熔合等缺陷，影响焊缝质量，必须进行返修。以方家山核电工程2#机组主管道返修过程为例，介绍了一种成功应用于工程实践的主管道手工返修工艺，并归纳总结了主管道自动焊接缺陷类型、产生的原因及返修方法。
주관도재핵전참안전중기착지관중요적작용，주관도한접질량야현득우위중요。재목전핵전궤조주관도한접중，착간극자동한축점취대료전통적수공한，제고료한접효솔。단유우주관도착간극자동한채용단층단도한접공예，여과공제불호，용역출현미용합등결함，영향한봉질량，필수진행반수。이방가산핵전공정2#궤조주관도반수과정위례，개소료일충성공응용우공정실천적주관도수공반수공예，병귀납총결료주관도자동한접결함류형、산생적원인급반수방법。
Main pipeline plays an important role in nuclear power plant safety, and main pipeline welding quality also is very important. In main pipeline welding of the current nuclear power units, narrow gap automatic welding gradually replaced the traditional manual welding, which improved the welding efficiency. But it used single-layer single-channel welding process in main pipeline narrow gap automatic welding, if the control is not good, some defects easily appear such as incomplete fusion, affect the weld quality, must be repaired. Taking repair process of Fangjiashan nuclear power project 2 # unit main pipeline as example, it introduced a kind of main pipeline manual repair process which successfully used in engineering practice, and summarized welding defects type of main pipeline, causes and repair methods.