CAJ | 학술논문

使用脉冲氩弧焊方法对大型发电机转子25Cr2Ni4MoV补焊，通过对4种焊接材料的甄选，确定了与不同深度缺陷匹配的焊材选择方案。研究了脉冲氩弧焊补焊接头的力学性能及金相组织，结果表明焊缝的抗拉强度与冲击功达到与母材基本相近，通过合适的后热处理也可以在一定程度上降低热影响区的淬硬倾向。脉冲氩弧焊补焊接头性能可以满足转子运行工况要求。
사용맥충아호한방법대대형발전궤전자25Cr2Ni4MoV보한，통과대4충한접재료적견선，학정료여불동심도결함필배적한재선택방안。연구료맥충아호한보한접두적역학성능급금상조직，결과표명한봉적항랍강도여충격공체도여모재기본상근，통과합괄적후열처리야가이재일정정도상강저열영향구적쉬경경향。맥충아호한보한접두성능가이만족전자운행공황요구。
The pulse-TIG was applied to conduct the repair-welding technology on the large-size turbine genera-tor rotor made of the 25Cr2Ni4MoV. A proper program was selected through comparison one another among 4 kinds of welding materials based upon different defect depth. The strength characteristic and quench organization of the pulse-TIG were studied, coming with the conclusion that the weld joint tensile strength and impact ability approached close to those of the base materials. Quench harding in the heat-affected zone could be reduced into a certain level by the proper after-heating treatment. The characteristic of ro-tor processed by the repair-welding technology employing pulse-TIG, met with the requirement of the operating condi-tion of the rotor.