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Lakshmana Swamy, N.
- Effect of Root Opening on Distortion of Butt-Joints in Submerged Arc Welding
Authors
1 Department of Mechanical Engineering, Government Engineering College, Ramanagara-562159, IN
2 Department of Mechanical Engineering, University Visvesvaraya College of Engineering, Bangalore University, Bangalore-560001, Karnataka, IN
Source
Indian Welding Journal, Vol 49, No 1 (2016), Pagination: 48-56Abstract
The dimensional differences in steel bridge manufacturing caused by weld deformation often occur for butt joints of thin plates. The problems of distortion, residual stresses and reduced strength of structure in and around a welded joint are of major concern in the shipbuilding industry and other similar manufacturing industries. The various distortions induced by welding process and restriction of these distortions may lead to higher residual stresses. The prediction of distortions in ship panels are of great importance from the point of view of dimensional control. In view of this, it has been investigated the effect of ischolar_main opening on the transverse shrinkage, longitudinal shrinkage and angular distortions of butt joints. The experimental investigations are carried out using Submerged Arc Welding with zero mm, 1 mm and 2 mm ischolar_main opening for constant heat input. The transverse and longitudinal shrinkage increase but the angular distortion decreases with increase in the ischolar_main opening.Keywords
Distortion, Root Opening, Shrinkage, SAW, Butt Joints.
- Effect of Groove Angle in Butt Joints on Angular Distortion in Submerged Arc Welding
Authors
1 Department of Mechanical Engineering, UVCE, Bangalore University, Bangalore-560 001, Karnataka, IN
Source
Indian Welding Journal, Vol 46, No 3 (2013), Pagination: 33-37Abstract
When steel structures are welded, a localized fusion zone is generated in the weld because of the high heat input from the arc, and then non-uniform temperature distribution through heat conduction is induced. Angular distortion is a major problem and most pronounced among different types of distortion in the butt welded plates in fabrication industries. This angular distortion is mainly due to non-uniform transverse shrinkage along the depth of the plates welded. Restriction of this distortion by restraint may lead to higher residual stresses. It is difficult to obtain a complete solution to predict angular distortion that may be reliable over a wide range of processes, materials, and process control parameters. Thus, the development of proper techniques for reducing and controlling distortion would lead to more reliable welded structures with a reduction in fabrication cost. The effect of groove angle on the angular distortion in butt welded joints produced by submerged arc welding process was investigated. In this study, specimens were prepared for different groove angles for different ischolar_main opening and throat thickness in single V-groove, bevel groove and double V-groove butt joints. These specimens were welded using submerged arc welding process with constant process parameters. The angular distortion was measured and analyzed for all the specimens. It was observed that, the angular distortion decreases with increase in the groove angle for the given ischolar_main opening and throat thickness.