argon purging is the lifeline of secondary steel making units, without which no thermal and chemical homogeneity is possible since there wont be any circulation of liquid steel mass initiated by the rushing argon bubbles from the bottom of the ladle.
once the ladle is kept on the ladle car, argon line has to be connected to the ladle. that can either be done manually or using auto-couplers.
here in these pics, an employee (without safety-helmet ) checks for, identifies and fixes a "O" ring in the ladle female part of the auto-coupler. normally there are 3 or more bores covered by sealing "O" rings; if any of the O ring is damaged or missing, then purging argon into the ladle is almost impossible as the missing/damaged O ring lets the argon leak through the auto-coupler joint.
i shall post more closer images later as i have to sift through a very huge collection of pics from my mobile-cam-archives.
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