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Welding, Arc Questions

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I have a customer using Panasonic robots with Lincoln power supplies experiencing random shielding gas shortages. We have checked the gas hoses, replaced electronic boards, replaced solonoids, and have a gas tracker on the gas line. The problem may last 1 to 4 welds at random times. When they experience this, they restart the program and it works fine. It happens 1 to 14 times per day at random times with random weld positions. We have asked Lincoln as well as Panasonic and neither have a fix. I thought it may be a positional issue but the hose never seems to be pinched or cut off. Have you experienced this issue before?

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