بررسي هاي تجربي در جوشكاري انفجاري لوله دو جزئي

EXPERIMENTAL INVESTIGATIONS OF THE EXPLOSIVE WELDING OF DUPLEX CYLINDER

جوشكاري انفجاري لوله دو جزئي آلياژهاي آلومنيوم 6061 به فولاد زنگ نزن 304L ، با تغيير فاصله توقف و نسبت بار انفجاري توسط دو ماده منفجره Anfo/Silica و Ammatol صورت پذيرفته است. سرعت لوله پرنده توسط روش تماس پيني اندازه گيري گرديد. نتايج نشان مي دهند كه در يك نسبت بار انفجاري ثابت، با افزايش فاصله توقف، سرعت لوله پرنده افزايش مي يابد. در اين مطالعه، استحكام برشي فصل مشترك اتصال مورد ارزيابي قرار گرفته و منحني تغييرات ريزسختي در فصل مشترك همه نمونه ها رسم گرديد. شكل فصل مشتركهاي حاصله به صورت صاف ،موجي،موجي با گردابه تقسيم بندي مي شوند.افزايش فاصله توقف باعث تغيير شكل فصل مشترك و تغيير از حالت صاف به موجي و موجي با گردابه گرديده است .

Experimental tests were performed to explosively welded 6061 aluminum to 304L+ stainless steel tube composites, using various stand-off distances and explosive ratios. Most of the experiments were carried out with the Anfo/Silica explosive mixtures and few tests were performed with the Ammatol mixtures. The flyer tube velocity was measured with pin contact method. Experiments showed that for a constant explosive ratio, the flyer tube velocity increases with stand-off. The integrity of the bond interface was examined by the shear test. In addition, the microhardness profiles at the interface for all the samples were determined. Metallographic inspections of the bond interfaces were also carried out. The shape of the interface fell roughly into 3 classes, straight, smooth wavy or wavy with some vortex shedding. The results show that the increase of stand-off distance gives rise to changing of the shape of the interface from straight interface to transition from straight to wavy interface. Increasing the stand-off distance further leads to producing wavy interface and wavy with vortices at the interface.