THERMAL AND STRESS-ANALYSIS DURING DIFFUSION BONDING OF METAL DRUM ROTOR DISKS USING ELECTROMAGNETIC HEATING

The diffusion bonding procedure between two stages of a nickel alloy d rum rotor surrounded by a double-wrapped heating coil is modeled by co mputing the time-dependent temperature field and stresses. Tire power deposition in the workpiece is modeled by numerically solving the low- frequency Maxwell equations in the enclosure. Nonlinearities due to te mperature dependent electrical, thermal, and stress-related properties are handled by iterating between tire solvers for the magnetic potent ial, temperature, and stress. Parametric studies are performed to inve stigate the influence of coil placement and pressure load on the tempe rature and stresses near the bond joint.