The material used in the welding test is 2A12 aluminum tube aircraft construction 8mm thick, and the mixing head material is H13 hot die steel.Tensile test was carried out on css-44100 electronic universal tester.Hardness measurements were made on the hx-1000 microhardness
tester.Continuous dynamic recrystallization occurred in the weld zone to form fine equiaxed crystals.Under the action of mechanical force and thermal cycle, the affected area of heat engine has an arc structure.Microstructure grain coarsening occurred in the heat affected zone.When the rotational speed is 375r/min and the welding speed is 100mm/min, the tensile strength of the joint is the highest, which can reach 88.6% of the base material.The distribution of weld hardness is in the shape of "W", and the minimum value appears in the transition between the heat-affected zone and the heat-affected zone on the retrograde side.
Special 2A12 aluminum tube aircraft construction copper connection terminal and other accessories, its connection 2A12 aluminum tube cable 2A12 aluminum tube end diameter and cable conductor diameter to zero tolerance match, reduce the pressure requirements of the pressing tool.The outer diameter of the terminal is matched with the traditional pressing copper cable tool. The special tool for pressing 2A12 aluminum tube aircraft construction cable is no longer used in the engineering construction. Instead, the copper cable pressing tool is used directly.
