A Preliminary Report on the Strength and Metallography of a Bimetallic Friction Stir Weld Joint Between AA6061 and MIL-DTL-46100E High Hardness Steel Armor
FOCUS-HOPE DETROIT MI
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One half inch thick plates of 6061-T6 aluminum alloy and High Hardness steel armor MIL-STD-46100 were successfully joined by the friction stir welding FSW process using a tungsten-rhenium stir tool. Process parameter variation experiments, which included inductive pre-heating, tool design geometry, plunge and traverse rates, tool offset, spindle tilt, and rotation speed, were conducted to develop a parameter set which yielded a defect free joint. Laboratory tensile tests exhibited a maximum yield stress of 176 MPa, which is 91 of the strength of a comparable all-AA6061 FSW joint. Scanning electron microscopy SEM and energy dispersive X-ray spectroscopy EDAX analysis also show atomic diffusion at the material interface region.
- Properties of Metals and Alloys