The system provides for MIG welding in the environment of outer space or wherever there is little or no atmospheric pressure. The commercial potential for this system is limited but the idea is offered due to its potential in those areas where its application might benefit an industrial user. The system prevents arc dispersion by containing and focusing the plasma to increase the heat transfer to the working surface, preventing the dispersion caused by the vacuum. It also regulates the flow rate by using available valves to govern the gas flow. Means of regulating the flow rate of the inert gas is provided by use of needle or other precision valves, adjustable to vary the rate at which gas enters the pre-plasma chamber.
Detailed information is contained in the patent number listed below.
A copy is available at the address and telephone listed at the end of this document. The invention is owned by NASA and is available for licensing, production, and marketing.