스테인리스강 TIG 맞대기 용접 루트패스에서 단차극복을 위한 공정 개발

Abstract

TIG welding is used to produce high quality weldment. However it has some problems such as unstable backbead after welding. In order to overcome those problems, there are many ongoing studies to investigate that various welding factors have influence on stable backbead. However it is difficult to find a paper to overcome unstable backbead in case of joint misalignment in weld groove. Therefore, it is necessary to develope TIG welding process that enables to from stable backbead when misalignment exist. In this study, the effect of misalignment on back bead width with butt joint welding on STS304 thickness 3mm was investigated. Arc length was changed from 1mm to 3mm. Misalignment was changed from 1mm to 2mm. Back beveling height was changed from 0.5mm to 2mm. Back bead width was increased as misalignment and arc length was decreased in this range. Back bead becames higher as back beveling height up to misalignment though arc length varies from 1mm to 3mm was increased.