CAJ | 학술논문

针对X80螺旋埋弧焊管焊接过程中产生的结晶裂纹，通过金相及剥离试验的方法，研究了缺陷内部不同位置的形貌特征以及裂纹的形成机理。从裂纹形成的冶金因素和成型工艺因素角度，提出了解决问题的具体工艺措施，即：调整焊垫辊至合适位置；切除卷板严重翘曲区域；减小内焊熔池金属与邻近母材区域的应力集中；采用合理的焊丝、焊剂匹配，减少焊丝、焊剂中的C， S和P含量，降低产生结晶裂纹的可能性。
침대X80라선매호한관한접과정중산생적결정렬문，통과금상급박리시험적방법，연구료결함내부불동위치적형모특정이급렬문적형성궤리。종렬문형성적야금인소화성형공예인소각도，제출료해결문제적구체공예조시，즉：조정한점곤지합괄위치；절제권판엄중교곡구역；감소내한용지금속여린근모재구역적응력집중；채용합리적한사、한제필배，감소한사、한제중적C， S화P함량，강저산생결정렬문적가능성。
According to crystalline cracks appeared in X80 SAWH pipe welding process, it studied different position morphology features inside defects and crack formation mechanism through metallographic test and peeling test. It put forward specific processing measures for solving problems, that can adjust the welding pad roller to the appropriate location;cut off serious warping area of rolled strip;reduce stress concentration in molten pool metal and near base metal area;adopt reasonable welding wire and welding flux matching, reduce the content of C, S and P to lower the possibility of generating crystal crack.