Joining GR2 and GR5 Titanium Alloys with Diffusion Bonding Method Using Copper Interlayer
Haluk KEJANLI Nida KATI Uğur Çalıgülü
AbstractIn this study, GR2 and GR5 alloys among Ti alloys which have increasingly more usage areas in the metalmaterial industry were joined by diffusion welding method using a copper interlayer. The diffusion temperature was selected as a variable parameter during the diffusion welding process and the effects of the welding temperature on the joint quality were examined. Diffusion welds were made by applying a pressure of 5 MPa at 950 and 980 °C to the samples prepared in Ø12 x 12 mm dimensions in specially prepared diffusion welding apparatus and sending argon gas with a purity of 99.9% at a flow rate of 5 lt/min into a furnace with silicon carbide rod. Welding process was carried out to the experimental samples for 55 minutes. The samples were kept in the furnace until the furnace’s temperature decreased to 250 oC and then they were kept to cool down at room temperature. Microstructure analyses were then performed by using an optical microscope and microhardness analysis was performed on each sample. As a result of the study, it was found that as the temperature of diffusion welding increased, the better welded joints were obtained in the samples and their microhardness values also increased.