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Optimization of welding parameters and microstructure and fracture mode characterization of GMA welding by using Taguchi method on SS304H austenitic steel

Rizvi S. A., Ali W.

Mechanics and Mechanical Engineering

2018

Vol. 22, nr 4

1121--1131

This study is centre on optimizing different welding parameters which affect the weld-ability of SS304H, Taguchi technique was employed to optimize the welding parameters and fracture mode characterization was studied. A number of experiments have been conducted. L9 orthogonal array (3x3) applied for it. Analysis of variance (ANOVA) and signal to noise ratio (SNR), a statistical technique was applied to determine the effect of different welding parameters such as welding current, wire feed speed and gas flow rate on weldability of SS304H.Tensile strength, toughness, micro hardness and mode of fracture was examined to determine weldability of SS304H and it was observed from result that welding voltage have major impact whereas gas flow rate has minour impact on ultimate tensile strength of the welded joints and optimum process parameters were found to be 23 V, 350 IPM travel speed of wire and 15 l/min gas flow rate for tensile strength and mode of fracture was ductile fracture for tensile test specimen.

Reverse osmosis as one-step wastewater treatment: a case study on groundwater pollution

Ali W., Rehman W. U., Younas M., Ahmad M. I., Gul S.

Polish Journal of Chemical Technology

2015

Vol. 17, nr 4

42--48

The present case study is focused on performance evaluation of a Reverse Osmosis (RO) membrane based pilot plant to treat the ground/surface drinking water sources polluted by flood, rivers and/or canals. The RO plant was designed, fabricated and then operated with polluted water. Two feed water samples having a TDS of 2.000 mg · L−1 and 10.000 mg · L−1 respectively, were taken and analyzed for physical, chemical and microbiological contaminants. The RO plant was run once through over a span of 100 hrs at an operating pressure of 15 bar. TDS rejections were found to be more than 94% while permeate flux was measured to be 25.82 L · m−2 · hr−1 to 40.55 L · m−2 · hr−1. Results show that RO plant has a potential to remove physical, chemical and microbiological contaminants like Total Coliform and E. Coli in one step.