Removing contaminants from vicinity of welding joint
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Weld purging is the act of removing, from the vicinity of the joint; oxygen, water vapour and any other gases or vapours that might oxidize or contaminate a welding joint as it is being welded and immediately after welding.[1]
Stainless steels, duplex steels, titanium-, nickel- and zirconium- alloys are sensitive to the presence of air, oxygen, hydrogen, water vapour and other vapours and gases that may combine with the hot metal as it is being joined.
Such gases may combine with the metal to form undesirable compounds that may reduce corrosion resistance or may be instrumental in creating cracks or other structural defects in metals.
Weld Purging is generally necessary for the first weld run when joining two separate parts. This sealing weld will be called a “root run” when it takes more than one run or (pass) to fully seal the root area from above.[2]
Once the root run has been completed, it is possible to stop the purging process unless the welding engineer has specified that purging should be continued for the second and third passes for example in case the root weld becomes hot enough to oxidise in the air that will have replaced the purge gas.
^Sewell, Ron. "Recent Advanced in Weld Purging." Welding Journal 1 June 2015. Print.
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