A pulsed, high current machine has recently been developed for producing pulsed magnetic fields in the 70 Tesla range, with long operational life of the load inductor. The current source, which drives a single‐turn solenoid, is a high voltage, low inductance capacitor bank. Connections from the capacitor bank to the inductor are by way of low inductance multichannel rail spark gap switches and low inductance buswork. Peak magnetic fields of 72 Tesla have been measured in the bore of the single‐turn inductor. These measurements have been made using the magneto‐optical, Faraday, effect. The pulsed magnetic machine has recently been used to develop enclosure welds on tubing which is being evaluated as possible cladding material in nuclear reactors.