49 CFR § 179.300-10
Postweld heat treatment
November 18, 2020
After welding is complete, steel tanks and all attachments welded thereto, must be postweld heat treated as a unit in compliance with the requirements of AAR Specifications for Tank Cars, appendix W (IBR, see §171.7 of this subchapter).
[68 FR 75763, Dec. 31, 2003]
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