Study On Arc Welding Of Ti₃AlC₂ Ceramic And Cu(Mg) Alloy

Ti₃AlC₂ ceramic,as a newly developed ceramic material with both ceramic and metal traits,is to be widely applied in areas such as mechanism,energy,avigation, electronics and chemical industry.For the first time the welding of Ti₃AlC₂ ceramic and Cu(Mg) is studied in this paper by the method of arc welding without solder,which has confirmed the feasibility of the welding method,opened out the relationship between the organization and performance of the joints and the welding technics,and probed into the influence of the welding technics parameter in arc heating process on the temperature field inside the welding material.The study and its result will lay a foundation for the low-cost manufacture of the big-sized,complicatedly shaped and multiattribute Ti₃AlC₂ ceramic component,which can advance the application of Ti₃AlC₂ ceramic material in industry.A method which combines experiment and numerical simulation is adopted.A welding experiment on Ti₃AlC₂ ceramic and Cu(Mg) was done with the method of arc welding without solder.By using SEM and EDS the microstructure and the element distribution on the joints interface were observed.Besides by using XRD the substance composition of the joints was analyzed.The bending intensity on the welding sample were measured and the intensity and resistance rate of the joints were tested.As to the arc heating process of the welding,a simplified model of the two-dimensional symmetry was built up.By the ANSYS numerical simulation the influence of the welding qualifications such as the arc current,the arc time,the sample size on the temperature field inside the welding material was studied and the best technics parameter was fixed.The study indicates that arc welding can help combine firmly the Ti₃AlC₂ ceramic and Cu(Mg) and the intensity of welding joints exceeds the one of the Ti₃AlC₂ ceramic material itself.Reaction between two welding interface determine it's welding mechanism,temperature distribution of welding face of arc heating process and the melting of Cu(Mg) alloy and the organization of Ti₃AlC₂ Ceramic are decided by technics parameter and the sample size which are the key factors influenced the structure and properties of joints.When the arc current density is between 4.7A/mm² and 5.7A/mm² and the arc time is between 1s and 1.5s,the melting quantum of Cu(Mg) and the temperature on the welding point of the Ti₃AlC₂ ceramic are the best.Besides the Cu(Mg) and the Ti₃AlC₂ ceramic react and make the joints structure of TiC_x and Cu(Al,Mg),with the TiC_x tiny and dispersed equably,and with the joints having high intensity and good electric characteristics.