When a positively buoyant vertical fluid jet directed downwards from its source impinges on a horizontal flat surface, the resulting flow is termed an “impinging fountain”. These flows arise in a number of practical situations, for example, in gas metal arc welding (GMAW). Developing a description of this flow presents the researcher with a number of challenges and forms the motivation for this...

Consumable DE-GMAW is an innovative welding process, which can significantly increase the deposition rate without raising the base metal heat input to an undesired level. To be qualified as a practical manufacturing process, feedback control is required to assure the presence and stability of the bypass arc. To this end, the bypass arc voltage was selected to monitor the state of the bypass arc...

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 focusses on effect of flat wire electrode gas metal arc welding (FW-GMAW) inline during the process to improve quality weld bead. Since perimeter has enlarged, turbulence molten droplet characteristics is altered due electromagnetic force. To bring out, butt joint are proven with use electrode. The experimental results indicated that, and their orientations significantly factors bead...

Amodel based on a double-ellipsoidal volumeheat source to simulate the gasmetal arcwelding (GMAW) heat input and a cylindrical volume heat source to simulate the laser beam heat input was developed to predict the temperature field and thermally induced residual stress in the hybrid laser–gas metal arc (GMA) welding process. Numerical simulation shows that higher residual stress is distributed i...

This paper presents a new method for measuring and classifying spatter in gas metal arc welding (GMAW) by optical monitoring of the weld pool and surrounding area via a high-frame-rate camera. Image processing and tracking algorithms are described that extract and classify individual spatter events from raw camera images. This new sensor is then used to investigate the relationship between work...

This paper addresses the problem of fault-tolerant robust supervisory control of discrete event systems (DES’s) with model uncertainty. Necessary and sufficient conditions for the existence of a fault-tolerant robust supervisor are derived. If the conditions are satisfied, then tolerable fault event sequences embedded in the system can be achieved. The results obtained are applied to design, mo...

Double-Electrode Gas Metal Arc Welding, referred to as DE-GMAW, is a novel process which decouples the melting current into base metal current and bypass current by adding a bypass torch to a conventional GMAW system to establish a bypass arc. This makes it possible to increase the melting current while the base metal current still be controlled at a desired level. Experiments have been done to...

In gas metal arc welding (GMAW), the weld bead shape is an important factor that directly related to quality of welded joints. This study investigates effects process parameters, including speed (WS) and leading trailing wire feed rates (WFR), on shape, leg length penetration depth, in tandem GMAW aluminum 5083-O alloy. An asynchronous direct current–direct current pulse system a torch were des...

An ER430LNb ferritic stainless steel wire was used for a gas metal arc welding (GMAW) test. The characteristics of droplet transfer and its corresponding voltage current waveforms were investigated using high-speed camera synchronous acquisition electrical signals. weld formation, patterns microstructures under different parameters observed, the effect level on frequency discussed. As results s...