Preliminary Report on the Strength and Metallography of a Bimetallic Friction Stir Weld Joint Between AA6061 and MIL-DTL-46100E High Hardness Steel Armor.

摘要

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.