US lawFederal (United States)RegulationsTitle 46 CFR — ShippingChapter I — COAST GUARD, DEPARTMENT OF HOMELAND SECURITYPart 56 — PIPING SYSTEMS AND APPURTENANCESSubpart 56.70—Welding56.70-346 C.F.R. § 56.70-3Limitations.Last amended: 2024Year: 2026Length: 10 wordsOfficial source Cite as 46 C.F.R. § 56.70-3 (2026)Backing strips used at longitudinal welded joints must be removed.Previous46 C.F.R. § 56.70-1Next46 C.F.R. § 56.70-5