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1. (WO1992010328) IMPROVEMENTS IN OR RELATING TO LINEAR FRICTION BONDING
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CLAIMS:

1. A method of controlling a linear friction bonding process in which two articles are oscillated in a linear direction relative to one another whilst simultaneously being pressed together, so as to be welded together by the friction of the oscillation, the method comprising monitoring the value of the amplitude of the
oscillation, comparing the monitored amplitude of the oscillation with a predetermined value of the amplitude, deriving a signal from any difference therebetween, and using said derived signal to change the amplitude of the oscillation so as to at least reduce said difference.

2. A method as claimed in Claim 1 including measuring the rate of change of the monitored value of the
amplitude of oscillation with respect to time and using that rate of change to modify said derived signal so as to reduce any tendency of the changed amplitude of oscillation to hunt.

3. A method as claimed in Claim 1 or 2 comprising monitoring the value of the amplitude of oscillation adjacent the interface between the articles being
bonded.

4. A method of controlling a linear friction bonding process substantially as hereinbefore described with reference to the accompanying drawings.