Combined process of plasma and arc welding by different-polarity pulses of current (《hydra》-process)

摘要

The process of plasma-arc welding of aluminium alloys 10...30 mm thick has been developed. The process provides for feeding the reverse-polarity current pulses to the first and third tungsten electrodes as welding progresses and, in the intervals between them, feeding the direct-polarity current pulses to the central plasmatron. Schematic of the device for implementation of the process is shown and its technological capabilities are described.