Measuring the Effect in Dependent Parameters for Arc Welding on the Quality Welding

This research dealt statistical analysis of the data that obtained from process of the electric arc welding for samples of the medium carbon steel which its hardness is equal to (156 HB). All welding pieces were produced by changing the practical Parameters, where tolerances of the electrode diameter were (2.5, 3.25, 4) mm and thickness of the steel pieces were (4, 4.25, 4) mm. This research aims to, first the variance analyses of the independent parameters versus quality of hardness in the welding zone. Second, optimization parameters find that effect in the quality of hardness that result from welding by signal-to-noise ratio (Taguchi method). Statistical analysis software (Minitab -16.0) used to generate graphs relative to the experimental results that obtained from tests. Results showed that the thickness and electrode diameter have significant effect in the hardness. Third level of both parametrs got predicted hardness (188.64 HB) and conformed test (186.35 HB) that were , .