Okla. Stat. tit. 59, § 1636

A. The certification fee for each welder shall be Twenty-five Dollars ($25.00). An additional fee of Ten Dollars ($10.00) shall be paid if the welder's certification has expired prior to renewal. The certification fee for each welding inspector shall be One Hundred Dollars ($100.00). The certification fee for each testing facility shall be Two Hundred Fifty Dollars ($250.00). B. Certificates for welders and testing facilities and welding inspectors shall be issued for a period of one (1) year, and shall be renewed by January 1 of each year for testing facility applicants and welding inspectors, and on the last day of the welder applicant's birth month; provided, however, that no welder applicant shall be required to renew his license more than once during any twelve-month period. Failure to renew the certificates within one (1) year of expiration shall require recertification.