Stable weld formation is still one of the goals pursued in variable-polarity plasma arc welding (VPPAW) of aluminium alloys. Basically, VPPAW is divided into three segments: the startup segment, during which the keyhole is generated, the main body segment, during which the keyhole is dynamically maintained, and the terminal segment, during which the keyhole collapses and the crater is ®lled. Ve...

The axial force measurement plays important role in tool designing and identification of its restrictions. Also, it is vital in design of machine mechanism and optimization of welding process parameters. In this study, a friction stir welded butt join on AA7075-T651 aluminum alloy plate is investigated. With change of some parameters, factors including axial force, mechanical properties, microh...

this paper aims at investigating the effects of weld nugget size and expulsion on the mechanical properties of low carbon steel resistance spot welds using tensile-shear test. mechanical performance of spot welds are described in terms of failure mode, peak load and failure energy obtained from the tensile-shear test. the effects of voids and porosity as well as electrode indentation associated...

The objective of this work is to study the effect of parameters on resistance spot weld of ASS316 material. In order to study the significance of the process parameters i.e. current, electrode force and weld cycles, towards the percentage improvement in material hardness. It is clear from the results that parameters significantly affect both the mean and the variation in the percentage improvem...

The possibility of using radiofrequency energy (RFE) to produce a sutureless anastomosis is attractive both to the military surgeon and on the grounds of cost and simplicity. To investigate this, fresh rabbit aorta was divided lengthways into 4 mm strips and apposed, intima-to-itima. A Valleylab Force 30 Electrosurgery machine supplied RFE at 500 kHz. The energy was applied using standard bipol...

-S 169 WELDING JOURNAL ABSTRACT. A 3-D transient numerical model was developed for simulation of gas metal arc (GMA) weld pools with free surface and droplet impact effects. This effort predicted a moving GMA weld pool by considering not only the heat transfer and fluid flow driven by surface tension gradient, electromagnetic force, buoyancy, and arc pressure, but also detailed information abou...

this paper presents a finite element analysis and its related experimental test of corrugated steel web beams subjected to fatigue loading. a particular focus in this study was set on the fatigue failure arising from the web-to-flange welded joint of the corrugated steel web beam. a detailed three-dimensional finite element model which explicitly includes the geometry of the web-to-flange welds...