The Welding Institute

James C Needham

Wayne M Thomas

Edward D Nicholas

Christopher J Dawes

Peter Temple-Smith

Michael G Murch

Raymond A Perryman

Robert M Rivett

Peter M Bartle

Friction welding

A method of monitoring a structure comprising the steps of:

Acoustic detection of defects in structures

A method and apparatus of monitoring the resistance characteristics of a circuit carrying an alternating current or a current having an alternating component is described. The apparatus includes first integration or averaging means for integrating or averaging the potential drop for the period between instants when the instantaneous current has the same value in a current loop; and display means for displaying a value representative of the output from the integration or averaging means.

Monitoring in-service resistance of AC conductors

A method and apparatus for short-circuit MIG welding is described. The apparatus comprises a power supply electrically connected with electrode wire and a workpiece in use; and electrode wire feed means. Monitoring means is provided for monitoring the ratio (M) of one of the mean and successive integral of the arc duration to the corresponding one of the mean and the successive integral of the short-circuit duration. The welding process can be monitored by monitoring the ratio (M).

Short-circuit MIG welding

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Saffron Walden, United Kingdom

James C Needham