Subpart A—Introduction, Approvals and Reports8Subpart B—General Design Requirements11Subpart C—Specifications for Pressure Tank Car Tanks (Classes DOT-105, 109, 112, 114 and 120)31Subpart D—Specifications for Non-Pressure Tank Car Tanks (Classes DOT-111AW, 115AW, and 117AW)69Subpart E—Specifications for Multi-Unit Tank Car Tanks (Classes DOT-106A and 110AW)20Subpart F—Specification for Cryogenic Liquid Tank Car Tanks and Seamless Steel Tanks (Classes DOT-113 and 107A)44
Regulationcurrent
49 CFR 179.100-9
-9 Welding.
Current as of 2026-08-18 Government source
eCFR editorial compilationAuthoritative but unofficial
(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.#
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