Effect of Root Opening on Distortion of Butt-Joints in Submerged Arc Welding

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 root 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 root opening for constant heat input. The transverse and longitudinal shrinkage increase but the angular distortion decreases with increase in the root opening

Effect of Bevel Angle in Bevel Groove Butt Joints on Shrinkages in CO2 Arc Welding Process

The in-plane distortions such as transverse shrinkages and longitudinal shrinkages induce residual stress in the welded joints which is undesirable as it reduces the strength of the welded structure. The problems of distortions in welded joints are of major concern in structures and the shipbuilding industry and in other similar manufacturing industries. The predictions of the degree of shrinkages in ship panels due to welding are of great importance from the point of view of dimensional control and it is important to analyze transverse shrinkages and longitudinal shrinkages. In this investigation, the experimental analysis of transverse shrinkages and longitudinal shrinkages bevel-groove butt welded joints in CO2 Arc Welding process by bevel angle and keeping process parameters constant. It was found that, the transverse and longitudinal shrinkages increase with increase in the bevel angle. There is a significant increase in the transverse shrinkage and small variation in longitudinal shrinkage

Effect of Included Angle in V-Groove Butt Joints on Shrinkages in Submerged Arc Welding Process

Abstract: 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 in other similar manufacturing industries. The predictions of the degree of shrinkages in ship panels due to welding are of great importance from the point of view of dimensional control and it is important to analyze transverse and longitudinal shrinkage. This paper deals with the experimental analysis of transverse and longitudinal shrinkage in single and double V-groove butt joints in submerged arc welding by varying included angle and keeping process parameters constant. It is found that, the maximum shrinkage was at the centre of the plate and minimum at the ends. It is also found that, the transverse and longitudinal shrinkage increase with increase in the included angle. There is a significant increase in the transverse shrinkage and small variation in longitudinal shrinkage

Optimizing Surface Roughness and MRR in turning operation using Taguchi's design of experiments approach

The objective of this paper is to obtain an optimal setting of turning parameters (Speed, Feed, Depth of Cut and Nose Radius) which results in an optimal value of Surface Roughness and Material Removal Rate (MRR) while machining Al 6351-T6 alloy with Uncoated Carbide Inserts. Several statistical modeling techniques have been used to generate models including Genetic Algorithm, Response Surface Methodology. In our study, an attempt has been made to generate Regression model for Surface Roughness and MRR. Also we have made an attempt to optimize the process parameters using Taguchi technique to obtain optimum Surface Roughness and optimum MRR. S/N ratio and ANOVA analysis were also performed to obtain significant factors influencing Surface Roughness and MRR. © Research India Publications

MALIGNANT MELANOMA – CUTANEOUS METASTASES

Melanoma composed of melanocytes may arise in the skin or other tissues harboring melanocytes, such muco-cutaneous junctions, mucosa including the conjunctiva, iris, choroids and substantia nigra.1 Metastases to the skin and subcutaneous tissues from a malignant melanoma are less common. A case of multiple painless nodules on the body that revealed metastatic deposits of melanoma on histopathological examination is being reported