Okla. Stat. tit. 59, § 1634.1

Notwithstanding any other provision of law, weldments subject to the provisions of Section 1624 et seq. of this title and performed on and after the effective date of this act shall meet the standards of the following codes: American Society of Mechanical Engineers (ASME) Section IX and American Petroleum Institute (API) 1104, 1107 and American Welding Society D1.1 and D1.3.