# -9 Welding.

- **operation:** document
- **citation:** 49 CFR 179.100-9
- **title:** -9 Welding.
- **source type:** regulation
- **agency:** Pipeline and Hazardous Materials Safety Administration
- **status:** current
- **official:** true
- **published on:** Not available
- **effective on:** 2026-08-18
- **summary:** (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.

(b) [Reserved]

[29 FR 18995, Dec. 29, 1964, as amended at 65 FR 58632, Sep
- **machine formats:** - **json:** https://regulus.evalyn.ai/document/49-cfr-179-100-9.json
- **markdown:** https://regulus.evalyn.ai/document/49-cfr-179-100-9.md
- **app url:** https://regulus.evalyn.ai/document/49-cfr-179-100-9
- **source url:** https://www.ecfr.gov/on/2026-08-18/title-49/section-179.100-9
**body:**

(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.

(b) [Reserved]

[29 FR 18995, Dec. 29, 1964, as amended at 65 FR 58632, Sept. 29, 2000; 68 FR 75759, Dec. 31, 2003]
- **truncated:** false
- **body characters:** 340