{"data":{"id":"us/49-cfr-179.100-10","jurisdiction":"us","citation":"49 CFR 179.100-10","heading":"-10 Postweld heat treatment.","body":"(a) 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).\n(b) For aluminum tanks, postweld heat treatment is prohibited.\n(c) Tank and welded attachments, fabricated from ASTM A 240/A 240M (IBR, see § 171.7 of this subchapter), Type 304L or Type 316L materials do not require postweld heat treatment, but these materials do require a corrosion resistance test as specified in § 179.100-7(c)(2).","path":["Title 49—Transportation","Subtitle B—Other Regulations Relating to Transportation","CHAPTER I—PIPELINE AND HAZARDOUS MATERIALS SAFETY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION","SUBCHAPTER C—HAZARDOUS MATERIALS REGULATIONS","PART 179—SPECIFICATIONS FOR TANK CARS","Subpart C—Specifications for Pressure Tank Car Tanks (Classes DOT-105, 109, 112, 114 and 120)"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-49.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:34Z","sha256":"5ac958d4e30a53c89afec6c193a60fc9c31b7b0bbedbce0282174a9bbff36bc5","source_id":"us-cfr","stale":true,"prev":"us/49-cfr-179.100-9","next":"us/49-cfr-179.100-12"},"notice":"GroundRules: Original legal text. Not legal advice."}