CAJ | 학술논문

对动态控制低应力无变形（dynamically controlled low stress no - distortion，DC - LSND）铝合金 MAG 焊进行了数值仿真，利用数值仿真模型并结合优化算法对热沉参数进行了优化分析。通过对有限元软件的二次开发，实现了焊接热源程序的加载和热沉过程的加载。对比正常焊接过程，采用热沉实现了随焊激冷法后焊接残余应力降低。在其他条件热沉不变的条件下，随着热沉强度的增大，残余应力显著降低。在热沉强度不变的情况下，热沉与热源距离在30 mm 左右时，应力降低效果最为明显。
대동태공제저응력무변형（dynamically controlled low stress no - distortion，DC - LSND）려합금 MAG 한진행료수치방진，이용수치방진모형병결합우화산법대열침삼수진행료우화분석。통과대유한원연건적이차개발，실현료한접열원정서적가재화열침과정적가재。대비정상한접과정，채용열침실현료수한격랭법후한접잔여응력강저。재기타조건열침불변적조건하，수착열침강도적증대，잔여응력현저강저。재열침강도불변적정황하，열침여열원거리재30 mm 좌우시，응력강저효과최위명현。
The numerical simulations have been done for dynamically controlled low stress no-distortion(DC-LSND)aluminum alloy plate MAG welding,the optimization analysis of parameters of the heat sink had been done with the numerical simulation combining with optimization algorithm. Through second development FEM software,the user subroutine was made to build heat source and heat sink model. Compare with normal weld-ing process,the DC-LSND MAG welding showed that the control effect of welding residual stress was obvious lower. The more stronger of the heat sink the little residual stress obtained when other parameter no changed. At the same heat sink condition,the optimum parameters of the distance is obtained about 30 mm.