8629

8010

كارشناسي ارشد

جوشكاري

اصفهان: دانشگاه صنعتي اصفهان، دانشكده مواد

1392

پانزده،[116]ص.: مصور،جدول،نمودار

ص.ع.به فارسي و انگليسي

مرتضي شمعانيان، مسعود عطاپور

21/12/92

احمد منشي، علي اشرفي

مهندسي مواد

ID8010

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

optimization of the GTAW Welding Process Parameters on the AA by the Taguchi method Alireza Ahmadi Khosroabadi A ahmadikhosroabadi@ma iut ac ir Date of Submission Department of Materials Engineering Isfahan University of Technology Isfahan Iran Degree M Sc Language persian Supervisors Abstract AA AL alloys sheet with diameter of mm was prepared by GTAW process the alternative current frecunecy percent of positive cylce and current were changed welded samples were avaluated in the term of apparent mechanical and corrosion properties depth and width of weded samples in the visual test were measured cycle corrosion test as a corrosion test and microhardness shear puch and tensile test as mechanical tests carried out Taguchi methods was used to find optimum parameter and effect of each of them L perpendiculare arrays were utilized to reduce tests number SEM and optical microscope X ray and EDX were used high percent of magnesume and cast structure of weldment led to produce very coarce pricipitation these contributed to reduce corrosion properties of weldment rather than the base metal the percent of positive cylcle and value of current had influece on width and depth ofweldment respectively incresing the level of currence an d percent of positive cycle resulted in optimum apparent properties tangstan diameter had not effet on mechanical properties optimume shear strength was obtained in average level of current and high level of positive pole while optimum tensile strength was obtained in high level of current and percent of positive pole low level of currenct and high percent of frecoency did not have impac on mechanical properties on the other hand it had direct effect on optimum microhardness shear and tensile strength aslo frecuncy is an important parameter in corrosion properties which high frecuency low level of current and high percent of positive cycle led to a optimume of corrosion properties Keyword Taguchi mechanical behavior corrosion behavior optimization

مرتضي شمعانيان، مسعود عطاپور

احمد منشي، علي اشرفي