电焊机2025，Vol.55Issue(12)：45-49,78,6.DOI:10.7512/j.issn.1001-2303.2025.12.07
管道6点钟位置坡口形状对根焊缝背面成形的影响
The Influence of Groove Type on the Backside Weld Geometry at 6 o'clock Position of Pipe
摘要
Abstract
In the pipeline welding,the processing accuracy of groove and the fitting-up accuracy are difficult to kept consis-tent in practice;meanwhile,the gravity is in the opposite direction of the arc force when welding at 6 o'clock position,mak-ing it easy to have defect and to decrease the weld quality.The shape of groove will influence the shape of molten pool and further the backside weld geometry.In the present work,surface tension transfer(STT)welding was employed to weld the root pass of pipes with"U"groove and"V"groove at 6 o'clock position in order to explore the influences of groove type on the backside weld geometry.Experimental results showed that the increase in welding current can increase the arc force to promote the penetration degree.The molten pool volume of weld with"V"groove is larger than that with"U"groove,making arc force not large enough to support the molten pool and thus making the weld have a concave surface.Further-more,"V"groove has a narrow space at the bottom.It can make the arc easily deflect to the side,making the arc have more heat on the sidewall and further having a partial penetration.关键词
熔池重力/电弧力/坡口形状/背面成形/管道根焊Key words
gravity of molten pool/arc force/groove type/backside weld geometry/root pass welding of pipe分类
矿业与冶金引用本文复制引用
XU Wei,LI Weifeng,YANG Lanxin,CHEN Xin,WANG Wei,LIN Yongzhang,LIN Zhichen,WU Shaojie,WANG Zhijiang..管道6点钟位置坡口形状对根焊缝背面成形的影响[J].电焊机,2025,55(12):45-49,78,6.基金项目
国家自然科学基金(52375374) （52375374）
