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Published on Jan 4, 2010
The use of simple orifices placed at a MIG feeder to control flow create starting problems. They or any flow control device placed at the feeder provide insufficient gas at the weld start needed to purge the weld start area and MIG Gun nozzle of air. Welders can often detect this lack of start gas and try to increase the overall gas flow to compensate. If the orifice is only used to limit peak flow gas pressure still builds in the gas delivery hose. Gas waste still exits its just is spread over a longer time. This gives a false impression of saving wasted gas. a FREE technical paper is available at www.NetWelding.com which supplies more details along with a solution to the gas surge problem that works.