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Welded connections on precast tilt ups.

Leko is not certified to CSA Standard W47.1 “�����Ůɫ��Ƭ of companies for fusion welding of steel” and, therefore, does not meet the requirements of CSA S16 Clause 24.3 which is referenced in the National & Provincial Building Codes Section 4.3.4.1.
NBCC Section 4.3.4.1: "Building and their structural members made of structural steel shall conform to CSA S16 “Design of Steel Structures.”

CSA S16 Clause 24.3: “Fabricators and erectors responsible for welding structures fabricated or erected under this Standard shall be certified by the Canadian Welding Bureau to the requirements of CSA W47.1 (Division 1 or Division 2), CSA W55.3, or both, as applicable. Part of the work may be sublet to a Division 3 fabricator or erector; however, the Division 1 or Division 2 fabricator or erector shall retain responsibility for the sublet work.”