Engineers and welders familiar with ultrahigh-purity (UHP) stainless systems know that purging before welding is a critical step in achieving acceptable, oxidation-free welds. The downside is that purging can be time-consuming. For small-diameter tube, 3 in. OD for example, sealing the tube ends and welding might require just 10 minutes or so, but depending on the system's length, preweld and postweld purging can take an hour. Reducing the purge time is a key factor in making this process as efficient as possible.
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