High mechanical performance of similar Al joints produced by a novel spot friction welding technique

摘要: Abstract In this study, the protrusion friction stir spot welding (PFSSW) was introduced in study while a specially designed back plate (anvil) with on its surface and pinless tool were used. The effects of dwell time (6, 12, 18 s) investigated microstructure mechanical properties samples. Surface appearance zone showed that keyhole not formed weld relatively smooth. Microstructure results indicated uniform refine structure due to dynamic recrystallization presents higher hardness strength than base metal can be affected by time. penetration depth, (SZ) depth bonding area at interface two sheets increased increasing Fracture surfaces failed specimens present shear fracture times 6 12 s interfacial 18 s. proper tools process obtained 12 s. Considerable (220 HV) maximum failure load (6000 N) work compared other methods.