Assessment of laserbeam-welded tubular overlap joints made of magnesium and aluminium under multiaxial loading
The present paper compares the wrought light-metal alloys AlMg3.5Mn and MgAl3Zn1 based on the fatigue behaviour of laserbeam-welded overlapped tubular joints. The experiments were carried out under pure axial, pure torsional and combined proportional as well as nonproportional loading. The test results were assessed by applying the notch stress concept with a reference radius of r(ref) = 0,05 mm and compared with allowable stresses taken from a standard. Finally, two stress based multiaxial hypothesis are compared to each other based on the test results.