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

Effects of Vitamin-E, Morin, Rutin, Quercetin against Doxorubicin in Rabbits: A Hematological Study

ABSTRACT Vitamin-E and flavonoids are natural anti-oxidants present in the vegetable diet. The present study was conducted on New Zealand white rabbits aged between 3-6 months and averaging 1.5-3.0 kg in weight. Rabbits are divided into 5 groups of 6 in each; a 4-week feeding trail is used to evaluate the hematology of rabbits by feeding vitamin-E, flavonoids morin, rutin, and quercetin along with drug doxorubicin. Doxorubicin is a potential chemotherapeutic agent for the treatment of a variety of human malignancies. In the present study, the development of cardio toxicity was prevented by reducing oxidative stress using natural antioxidant vitamin E (50 IU/kg body weight) and flavonoids morin, rutin and quercetin. The four weeks treatment of flavonoids (20mg/kg body weight) were affectively controlled the oxidative stress induced cardiomyopathy in rabbits by doxorubicin (10mg/kg body weight) treatment for two days. The flavonoids regulated the hematological parameters at optimum levels. The hematological components of study included red blood cells (RBC), white blood cells WBC, Hemoglobin (Hb), lymphocytes (LYM), platelets (PLT), mean corpuscular volume (MCV), mean corpuscular hemoglobin (MCH), mean corpuscular hemoglobin concentration (MCHC), basophiles (BAS), eosinophiles (EOI), monocytes (MON), and neutrophiles (NEU). Results showed that hematological parameters were affected (P<0.05) by experimental diets. The overall conclusion of this study is that the flavonoids can act as antioxidants and they can control the alteration in the hematological parameters. By this study, the authors suggests that the flavonoids are natural anti-oxidants, which can be used in the various treatments of cancers as supplement to reduce the oxidative stress produced by the drugs

KNOWLEDGE AND PERCEPTION OF FARMERS REGARDING AGROCHEMICAL USAGE AND TOXIC AFFECTED BY RURAL FARMING VILLAGES OF KRISHNA DISTRICT, ANDHRA PRADESH, INDIA

<p>Agriculture is an important economic sector in India. Over 60 per cent of the rural households depend on agriculture practices as their principal means of livelihood. Agriculture Farmers are extensively using agrochemical for pest and diseases control in agriculture crop fields. Their precarious handling practices may lead to higher exposure resulting in adverse health and environments effects. Current study was aimed to evaluate the knowledge and Perception and agriculture practices regarding pesticide usage and its toxic effects by rural farmers and environments. A cross sectional study was conducted in the rural villages of Krishna District, Andhra Pradesh, India. Hard data were collected through face-to-face interviews, using a questionnaire contained three main sections questionnaire, its included personal profile of farmers, awareness of pesticides and pesticides handling practices. It was designed in English and translated into Telugu, the local language Telugu that is understood by majority of the farmers. A total of 100 rural agriculture farmers participated in this study with majority of age of 40-60 years about 55% out of 100 farmers, about 40% of the farmers knew the harmful effects of agrochemical. However, 20% of them were mixing the pesticides using their bare hands and 60% were not wearing any protective clothing during spraying agrochemical. Around 50% were carelessly disposing the leftover pesticides in the open fields. Exposure of farmers to pesticides is immense especially in rural areas. So understanding farmer's level of knowledge and levels of awareness of agrochemical safety is essential. Eye, Skin problems and neurological system disturbances were the most common pesticide related health symptoms. These findings showed that knowledge level is adequate among farmers but this did not reflect in their practice. There is a need for continuous pesticide safety education along with training to the farmers regarding use of personal protective devices, personal hygiene and sanitation practices during and after application of pesticides through the student's community services programs and chemical based pesticides awareness programs.</p&gt

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