Resistance Spot Welding Technology And Compression Performance Of Aluminium Honeycomb

For the application requirement of the honeycomb as an energy absorbing structure,in the present paper,the resistance spot welding technology of the aluminum honeycomb is detailed and square aluminum honeycomb structure specimen is prepared.The axial quasi-static compression performances of the resistance spot welding aluminum honeycomb and the same size adhesive aluminum honeycomb were tested under different temperatures to explore performance characteristics of square aluminum honeycomb specimen.Meanwhile,Abaqus finite element simulation is adopted to observe the axial compression behavior of the aluminum honeycomb specimen,analyze the deformation of aluminum honeycomb panel and the stress distribution around the solder joint.The optimized technological parameters for aluminum honeycomb resistance spot welding are determined by observing the microstructure and testing the shearing force of solder joint(the welding voltage is 250 V,the welding time is 1.4s,the electrode pressure is 60N).The shearing force of single solder joint is 66.5N,the positive tension is 30.9N.Compression stress-strain curve of aluminum honeycomb is characterized by linear elastic deformation,initial peak yield,stable yield and densification.Quasi-static compression tests are carried outwith different numbers of solder joints,which indicates thatthe plateau stress increases with the decrease of weld spacing,while the weld spot spacing has no obvious influence on the initial peak yield strength.The resistance spot welded aluminum honeycomb is less sensitive to the changeof environmental temperature.From-50°C to 100°C,the initial peak yield strength of aluminum honeycomb specimen decreases about 9.02%,and the initial peak yield strength of the adhesive aluminium honeycomb decreases about 38.97%.By observing the compression process of aluminum honeycomb specimen and Abaqus finite element simulation,the initial yield stack of the honeycomb occurs at the end of the honeycomb structure,then expands sequentially.There is no obvious stress concentration near the solder joint of aluminum honeycomb structure.