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Uploaded on Sep 6, 2010
The control of MIG welding shielding gas is more complex than meets the eye. Systems designed when the process was invented use high pressure to provide automatic compensation for the inevitable gas flow restrictions that occur in use. This high pressure creates a blast of excess gas at each weld start that not only causes gas waste but also pulls in air making weld start quality less than optimum. Some have tried to introduce low pressure devices to reduce the start gas surge. However that eliminates the needed automatic flow compensation feature creating less obvious but more significant problems. Attempting to control flow at the feeder with orifices or flowmeters does not provide the extra start gas needed to purge the gun nozzle and weld start area of moisture laden air. An optimum system is described that reduces gas waste by 40 to 50% or more and improves weld start quality. This patented device accomplishes this while maintaining system pressure and automatic flow compensation. More details about this inexpensive, patented solution are available at www.NewWelding.com.