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Old 04-20-2018, 12:59 AM   #1
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hi friends,
Why is purging required during welding?
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Old 04-20-2018, 01:02 AM   #2
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With purging, a gas is used to protect the weld seam until it has cooled to the point that oxidation no longer can occur. Usually, an inert gas, such as argon which is heavier than air, is used (see Figure 1). Other purging gases such as nitrogen and nitrogen/hydrogen blends can also be used.
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