چكيده به لاتين
Magnetically impelled arc butt welding (MIAB) is an arc-pressure welding method that provides the heat needed to weld two adjacent surfaces using electric arc rotation. The efficiency of this method has been established for the welding of thin-walled pipes, and it is currently used in the automotive industry for welding hollow axle shafts and shock absorber. Identifying the factors that affect the quality of the weld is of particular importance, especially the mechanical properties of the weld, which if the value of input parameters (research variables) is appropriate, we will achieve a high quality weld. In general, the purpose of this study is to research the effect of MIAB welding parameters and evaluate the welding quality of this method. Therefore, in this study, the effect of welding parameters of API 5L GradeA low alloy steel pipe, with different welding currents of 90, 100 and 110 A, welding time of 5.4, 6 and 6.6s and forging pressures of 500, 700 and 900 psi on tensile strength and height of Weld, as a response, was performed by Taguchi method. Analysis of variance and Signal to Noise (S/N) ratio also was used to investigate the effect of each of the input parameters on tensile strength and weld height. The results of modeling for tensile strength and weld height responses showed a correlation coefficient of 0.9334 and 0.8911, respectively, which indicates the reliability of the model by Taguchi method. The results of analysis of variance show that the parameters of forging pressure and welding time Which have an effect of 60.74% and 25.92%, respectively, have the greatest effect on the welding height and the parameters of welding current and welding time Which have an effect of 81.03% and 9.93%, respectively have the greatest effect on tensile strength. The microstructure of the base metal and the weld metal were examined under different welding conditions using a optical microscope and a scanning electron microscope (SEM). tensile, bending and hardness tests were performed to evaluate the mechanical properties of the joint. The results of mechanical tests also indicate that by controlling the welding parameters, a joint with good strength, flexibility and stiffness can be achieved.
