Due to lack of comprehensive experimental studies on welding processes, and to better understand the mechanisms behind these processes, especially the weld pool shape variations suspected due to Marangoni Effect or surface tension shear stress, a two-dimensional simulation model was developed to study the physics of gas tungsten arc welding (GTAW). Experimental spot-welds on Ti-5Al-5Mo-5V-3Cr w...

this paper presents a new arc starter circuit that is usable in manual metal arc welding (mma) power supplies. the proposed circuit uses an auxiliary circuit and a series coupling transformer for adding high frequency spikes to output dc voltage during arc striking. the proposed circuit is usable in inverter based arc welding supplies and it could result in a decrease of weigh, volume and expen...

Industrial technology programs around the country must be sensitive to the demands of manufacturing and industry as they continue to replace “vocational” curriculum with high-tech alternatives. This article examines whether or not teaching oxyacetylene welding in the industrial technology classroom is required to learn arc welding processes. The results of this study suggests that there appears...

The various welding parameters such as welding speed, voltage and gas flow rate were varied on HSLA steel and the effects of these parameters on weld bead geometry such as penetration, width & height have been studied. Mathematical equations have been developed using factorial technique. And the result of various effects are shown in tables. (Numerical Values). INTRODUCTION Wide variety of stee...

This paper explains an integrated method of using genetic algorithm on the experimental data for optimizing the process parameters for height to width ratio and use of artificial neural network techniques for predicting the effects on the four weld bead geometric descriptors (front height, front width, back height and back width) by the five controlling weld process variables (welding speed, wi...

In this paper, the combination of shielded metal arc welding (SMAW) and gas tungsten (GTAW) methods are used in a double V groove SS304 10 mm thick plate. Welding current variation 110A SMAW/120A GTAW, 100A SMAW/130A 90A SMAW/140A GTAW was to observe effect on tensile strength microstructure. Tensile test metallography were performed phenomenon. ImageJ software for microstructure analysis. The ...

The present paper describes fuzzy logic simulation of tungsten inert gas welding (TIG) process to predict the weldment macrostructure zones' shape profile characteristics. The prediction of the weld pool geometry together with the shape of the heat affected zone (HAZ) was accomplished taking into account of TIG welding process parameters such as arc traverse speed, welding current and arc lengt...

Carbon dioxide gas-shielded arc welding, which is widely used in industry, generates a large amount of spatter the medium and high current range. To solve this problem, we developed new welding process with low gas cost that call “Pulsed Gas MAG” (PGMAG) welding. In PGMAG metal transfer controlled by suitable addition Ar gas, but effect has not been clarified. Therefore, investigated 235- to 32...

This investigation aims to explore determinants of exposure to particle size-specific welding fume. Area sampling of ultrafine particles (UFP) was performed at 33 worksites in parallel with the collection of respirable particles. Personal sampling of respirable and inhalable particles was carried out in the breathing zone of 241 welders. Median mass concentrations were 2.48 mg m(-3) for inhalab...