# -9 Welding.

**Citation:** 49 CFR 179.100-9  
**Type / status:** regulation / current  
**Agency:** Pipeline and Hazardous Materials Safety Administration  
**Effective:** 2026-08-18  
**Published:** Not stated

(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

## Document text

(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]

## Provenance

- Official: Yes
- Source: <https://www.ecfr.gov/on/2026-08-18/title-49/section-179.100-9>
- Source ID: `ecfr`
- SHA-256: `bbf5f5a8f46ae45e696997fd6a05c89e634add650634655ab5d28f1aa51eae5c`
- Retrieved: 2026-08-20T05:46:20.606Z
- Exported: 2026-08-24T13:41:33.558Z
- Document slug: `49-cfr-179-100-9`

### Source metadata

```json
{
  "cfrTitle": 49,
  "part": "179",
  "section": "179.100-9",
  "subpart": "Subpart C—Specifications for Pressure Tank Car Tanks (Classes DOT-105, 109, 112, 114 and 120)",
  "corpusVersion": "2026-08-18",
  "jurisdiction": "US"
}
```