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Up Topic Welding Industry / Technical Discussions / Weld Finishing?
- - By Dmiller Date 10-01-2003 14:15
On a set of Bridge Shop Drawings prepared in 1973 there is a note in the tail of the weld symbol "PIT/300". What does that mean?
Parent - - By jwright650 (*****) Date 10-01-2003 14:28
How thick is the parts being welded by this symbol? Could it be P_reheat I_nterpass T_emperature of 300F?
John Wright
Parent - - By Dmiller Date 10-01-2003 15:11
The plates are 2" to 1-1/4" thick.
Parent - - By jwright650 (*****) Date 10-01-2003 17:25
Plates that fell into that thickness range would only have had a Preheat/Interpass Temp of 225F in the older code for A36, and 150F for A572 gr 50.
John Wright
Parent - By Dmiller Date 10-01-2003 20:28
We have grades A514 and A517 plates (typically 2" thick). Even some of the smaller (3/4") A36 plates have the PIT/300 designation.
Parent - By CHGuilford (****) Date 10-01-2003 16:09
Notes in the tail of the welding symbol are supplementary information. It looks like "PIT/300" is the WPS number the original fabricator welded with. Many DOT customers required that the WPS numbers be on the drawings before they would approve them.
If you are fabricating per that drawing, I would ask whoever supplied them if there is any significance that they know of, just in case that guess is wrong.

Chet Guilford
Up Topic Welding Industry / Technical Discussions / Weld Finishing?

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