TIG 오버레이 용접에서 변형 감소 공정 개발에 관한 연구

Abstract

Overlay welding is a technique to obtain surface layer having a corrosion resistance or heat resistance. Because plant industry has developed, demand of overlay welding also increases. In the overlay weld, ununiform heat cycle can cause a lot of welding deformation. Deformation of overlay weld has been a problem such as reduced dimensional accuracy , product reliability decreases. A lot of deformation is corrected in a number of ways. However, Correction of deformation costs a lot of time and cost. Also correction of deformation require skilled techniques. In addition, Heat straightening produce a large amount of green-house gas and effect on global warming. In this study, the effect of welding process on the deformation was examined. The amount of deformation by the conventional TIG welding process and Super-TIG welding process was compared quantitatively. As a result, the amount of angular distortion was as follows: Conventional TIG > Super-TIG Stringer bead > Super-TIG Oscillator bead. It’s considered that the angular distortion by Super-TIG welding was small because heat input ratio of Super-TIG welding was low. Therefore, Super-TIG welding process has advantage in overlay welding because of shallow penetration and low dilution ratio.