Abstract
Friction welding of A6061 aluminum alloy to SUS304 stainless steel was conducted. The joint efficiency was estimated from tensile strength, bending strength and torsional strength. The results are as follows, (1) The softened area of A6061 in joints welded at high forge pressures was narrow compared with the joint welded at low forge pressure, because the softened area was expelled into the color under the action of forge pressure. The joint strength depends on the width of the softened A6061 area. (2) Tensile strength of smoothed and notched specimens increased with forge pressure. Maximum joint efficiencies of these joints were about 87% and 93%, and fracture of the smooth and notched specimen showing the maximum efficiencies occurred in the softened A6061 area and at the weld interface,respectively. (3) Bending strength of joints welded at forge pressures not less than 80 MPa was almost saturated and maximum joint efficiency obtained was about 30%. (4) Torsional strength increased with forge pressure. The maximum joint efficiency obtained was about 75%, and joints with the maximum efficiency fractured in the softened A6061 area.
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