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duongwe (Mechanical) (OP)
13 Mar 11 21:53
why is it called "hot pass"?  
Helpful Member!  MJCronin (Mechanical)
14 Mar 11 8:47
Because when you gaze at an attractive woman, look deeply into her beautiful eyes, try to say something inteligent and watch her smile........ your heart is not getting cold.

Gimmie a star......

   

Duwe6 (Industrial)
14 Mar 11 15:53
My SWAG -- Scientific Wild-A$$ed Guess -- is that in the early days of pipelining, the root was run fairly 'cold' and fast.  This closes up the open gap in the root.  Then comes a hotter, slower pass to tie everything a little better:  the Hot Pass.

If you watch any root when the 2nd [hot] pass is being welded, it does indeed get very hot, and portions of the root may remelt.
DVWE (Petroleum)
14 Mar 11 16:41
The hot pass is intended to remelt the root to a certain degree, and thus eliminating any "wagon wheel tracks" that may be present in the root pass.

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