Abstract
Proper selection of the welding parameters can result in better joining. In this study, the effects of various welding parameters on tensile strength in joining dissimilar aluminum alloys AA6061-T6 and AA7075-T6 were investigated. 2 mm thick samples of both base metals were welded by semi-automatic gas metal arc welding (GMAW) using filler wire ER5356. The welding current, arc voltage and welding speed were chosen as variables parameters. The strength of each specimen after the welding operations were tested and the effects of these parameters on tensile strength were identified by using Taguchi method. The range of parameter for welding current were chosen from 100 to 115 A, arc voltage from 17 to 20 V and welding speed from 2 to 5 mm/s. L16 orthogonal array was used to obtained 16 runs of experiments. It was found that the highest tensile strength (194.34 MPa) was obtained with the combination of a welding current of 115 A, welding voltage of 18 V and welding speed of 4 mm/s. Through analysis of variance (ANOVA), the welding voltage was the most effected parameter on tensile strength with percentage of contribution at 41.30%.
Highlights
Gas metal arc welding (GMAW) process is a welding process which yields coalescence of metals by heating with a welding arc between a continuous filler metal electrode and the work piece
The aims of this study is to investigate the effect of process parameters such as welding current, welding voltage and welding speed on tensile strength on AA6061-T6 and AA7075-T6 by using the gas metal arc welding (GMAW) process
In order to investigate the effect of process parameters of the GMAW process, the tensile strength of the welded specimens were observed
Summary
Gas metal arc welding (GMAW) process is a welding process which yields coalescence of metals by heating with a welding arc between a continuous filler metal electrode and the work piece. This method of welding is widely used in various industrial applications such as construction, piping and automotive sector [1,2,3]. Arc welding of aluminum alloys with different grades will give problems due to the difference in thermal conductivity. The heat produced by the arc will flow more in the material with the larger thermal conductivity. Luijendijk, have successfully studied about GMAW method on dissimilar aluminum alloys 5xxx series and 6xxx series [6]
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