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کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Journal of Modern Processes in Manufacturing and Production
- نوع مقاله: Journal Article
- کلمات کلیدی: aluminum,Friction Stir Welding,Welding parameters,Thin Tube
- چکیده:
- چکیده انگلیسی: Recently friction stir welding for manufacturing of welded tubes has been developed. Friction stir welding is a continuous solid state welding process in which a non-consumable rotating tool using severe plastic deformation Can join materials can be join materials. Commonly, a portion of a specially shaped rotating tool is plunged between metalsjoint cross section and adjacent faces of the joint. After entering the rotating tool on the weld, a relative movement between the rotating tool and the friction heating surface creates a plastic deformation zone around the submerged sections of the tool. The work piece will be heated during the friction stir welding, but the work piece temperature will not reach to the melting point. One of the major problems for manufacturing the thin cylindrical tube is related to low mechanical strength while the melting method such as laser is applied. In this research, it is reveals that the friction stir welding method can be a reasonable
technique for manufacture of thin cylindrical parts. In this paper, an attempt was made to show the
possibility of frictional stir welding for manufacturing of thin cylindrical AA 6063aluminum parts. Various ranges of welding parameters include of rotation speed and welding speed are implemented to the thin thickness bent sheet i.e. 1.5 mm.By considering on obtained cylindrical tubes, it is found that the sound seem thin tube is achieved in rotational speed of 2500 rpm and welding speed of 4 mm/min respectively.- انتشار مقاله: 18-02-1397
- نویسندگان: Ahmad Reza Sabet,Hamid Montazerolghaem
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Modern Processes in Manufacturing and Production
- نوع مقاله: Journal Article
- کلمات کلیدی: finite element method,Hydrostatic Extrusion,Bimetallic Wire
- چکیده:
- چکیده انگلیسی: The hydrostatic extrusion is a new method of extrusion process. The most important advantage of this method is reduction of friction and close tolerance for the coating thickness. In this study, the hydrostatic extrusion simulation of bimetallic wires has performed using of finite element method. In the following the advantages of hydrostatic extrusion compared to the direct extrusion are presented.It can be concluded that by increasing the friction coefficient between the work piece and the die, the extrusion force value also increases. Increasing the cross-section reduction when the die angle kept constant as a result of increase in die length, consequently leads to an increase in the extrusion force.Regarding to the absence of friction in the die and almost uniformly deformation and homogeneous in the hydrostatic extrusion, the product with a uniform coating thickness can be obtained as it is very important for manufacture of very high length bi-metal products.
- انتشار مقاله: 23-09-1396
- نویسندگان: Hamid Montazerolghaem,Ali Delfani
- مشاهده
- جایگاه : پژوهشی
- مجله: International Journal of Advanced Design and Manufacturing Technology
- نوع مقاله: Journal Article
- کلمات کلیدی: Rotational Speed,Dissimilar Friction Stir Welding,Tailor Welded Blank,Welding Speed
- چکیده:
- چکیده انگلیسی: Today, in sheet metal forming processes, a new concept of fabricating consolidated sheets or in other words Tailor Welded Blanks emerged. Friction Stir Welding is one method for manufacturing TWBs and has numerous advantages over fusion welding methods for joining aluminum sheets. In the present study, TWBs made by friction stir welding of 6061-T6 and 5754-O aluminum alloys were studied. The effects of different tool rotational speeds and welding speeds on the mechanical properties and microstructural characteristics of dissimilar joints were evaluated. The results showed that in an appropriate range of speeds combinations, an optimum rotational speed exists at which maximum strength is achieved. Regarding welding speed, greater strength is attained at higher speeds. The microstructural analysis confirms that an increase in welding speed will result in grain size reduction and consequently higher tensile strength. It is observed that above the optimum rotational speed, the grain size of the nugget zone increases which results in decreasing tensile strength. With regard to elongation, it is found that despite the grain growth of the nugget zone at a higher ratio of tool rotational speed to welding speed, the elongation improved due to the dominant material existing in the weld zone. Positioning Al 6061 on the advancing side of the dissimilar joints leads to improved mechanical properties compared with positioning on the retreating side. It is notable that the degree of such improvement in ductility is much more remarkable than strength, which is valuable regarding formability concerns.
- انتشار مقاله: 08-10-1397
- نویسندگان: Farhad Teimouri,Hamid Montazerolghaem,Mahmoud Farzin
- مشاهده