49 CFR 179.100-9 - Welding.
(a) All joints shall be fusion-welded in compliance with the requirements of AAR Specifications for Tank Cars, appendix W (IBR, see § 171.7 of this subchapter). Welding procedures, welders and fabricators shall be approved.
Title 49 published on 2014-10-01
no entries appear in the Federal Register after this date.