Friction Welding of Aluminum Alloy Pipe to S25C Carbon Steel Pipe

摘要

Friction welding of various aluminum alloy pipes to S25C carbon steel pipe was conducted. The welded joints were offered to tensile test for examining the weldability of aluminum alloy and steel. In the case of A1050/S25C, A6061/S25C and A6063/S25C, the good welded joints were obtained under the constant welding condition, the maximum joint efficiencies of these joints were about 80.4 percent, 66.8 percent and 68.4 percent respectively, and the strong adhesive trace of aluminum was observed on the tensile fractured surface of S25C. In the case of aluminum alloys, rich in malleability, such as A5056, A6061 and A6063, the joint strength increased with an increase of burn-off speed. On the other hand, in the case of hard aluminum alloys having poor malleability such as A2011, A2017, A2024 and A7075, the joint strength decreased with an increase of burn-off speed. In case of A5052/S25C and A5056/S25C, if the optimum welding condition is selected, perhaps the good welded joint will be obtained.