| http://www.w3.org/ns/prov#value | - Once repositioned, an M code is used to call the CHAMBER ENVIRONMENT CHECK application subroutine before the welding chamber 108 is purged of impurities such as oxygen and water by introducing argon at a relatively high rate via the manifold tubes 336 into the welding chamber 108, whereby the heavier argon displaces the air driving it out over the edge of the welding chamber 108.
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