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By S B Dunkerton
Orbital friction welds have been produced in 25mm diameter carbon manganese steel (O.l9%C, 1.5%Mn) to determine the effect of process parameters on weld impact and metallurgical properties. Sound welds were produced over a wide range of welding conditions and high impact energies were also achieved by the use of high burn-off rates, and increased deceleration times. Fracture deviation was noted for welds with narrow heat affected zones when the notch was located near the periphery of the bar. Other notch locations have been identified which restrict or eliminate fracture deviation. Sound welds were also produced in a 0.14% carbon manganese steel and a low alloy steel. These steels could yield acceptable impact properties dependent on the welding and parent steel conditions.
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