Influence of welding speed on the melting efficiency of Nd:YAG laser welding

Melting efficiency is one of the more important measurable parameters in laser welding when assessing the performance of a process. This paper aims to study the effects of speed on the melting efficiency and energy transfer efficiency of Nd:YAG laser welding process. The weld bead on a 304L austenitic stainless steel sheet is created by varying the welding speed. The weld samples are cut in the transverse direction by using electric discharge machining, and the cross-section is prepared for metallographic inspection. The cross-sectional dimensions and beads length are measured by using an optical microscope and image analyzer. A methodology is proposed for estimating the weld pool volume from experimental data and a generalised equation for predicting the melting efficiency and energy transfer efficiency is developed. The results obtained by the proposed method have reasonably good agreement with the models proposed by various researchers. The outcome of the result shows the significant influence of welding speed on melting efficiency and energy transfer efficiency in welding of austenitic stainless steel thin sheets. It will be seen from results that one can select appropriate welding speed and processing conditions to obtain desired melting efficiency

AUTOMATIC SOLAR TRACKING SYSTEM

The solar energy is a clean, freely and abundantly available alternative energy source in nature. Capturing solar energy from nature is an advantageous task for power generation. Conversion of sun energy into another form is a highly complex phenomenon. For this purpose, Photo-Voltaic (PV) panels are used which convert Sun energy to Direct Current (DC) electrical energy. Conventional fixed type PV panels extract maximum energy only during 12 noon to 2 PM which results in less efficiency. Therefore, building of an automatic solar tracking system is the need of an hour. PV panels have to be perpendicular with the sun for maximum energy extraction which can be fulfilled by automatic tracking. This project includes the design and development of microcontroller based automatic solar tracking system

Design Development of A Regenerative Shock Absorber

Vibrations can be accumulated and converted to power in various forms. It is abundantly available in nature. Researchers have been working on tapping its potential majorly as it could solve major energy concerns .They can be captured and harnessed from ambient vibrational sources such as vehicular motion, railway tracks etc. Once harnessed, a variety of applications be it industrial on the large scale or general household on the small scale can be run. Regenerative electromagnetic harvesters implemented on automobiles is one such concept of obtaining electrical output on the large scale, by decreasing the reliance over the existing battery and hence powering up the peripherals by incorporating appropriate changes. Also in turn the overall efficiency of the automobile is increased