General requirements

0932 COLD FORMED STRUCTURAL HOLLOW SECTION

Cold-formed structural hollow section shall be intermediate grade steel complying with the requirements of BS 6363.

Cold-formed sections shall have neat finish free from defects that can be detected visually and that might impair the sections from the intended use and appearance.
0933 BLACK BOLTS & NUTS

Black bolts and nuts shall be hexagonal square or round bolts produced from mild steel. Black bolt and nuts shall comply with the requirement of BS 4190.

0934 WELDING ELECTRODES

Welding electrodes shall be material complying with the requirements of BS 639.

0935 RIVETS

Rivet shall be in mild steel or other suitable metal and alloys complying with the requirements of BS 4620.

094 EXECUTION
0941 GENERAL

The fabrication, assembly and erection of structural steel shall generally comply with the requirements of BS 5950, Part 2. Welding electrodes and procedures shall be such that, the mechanical properties of the deposited weld metal is not less than the metal to be welded.

Welding shall be executed in accordance with BS 5135 using the best modern practices.
All connections to be welded or riveted shall be securely held in position and approved by the Engineer to ensure accurate alignment, camber and elevation before any welding is commenced.
Welding and riveting shall be carried out only under the direction of an experienced and competent supervisor and after approval of trials.
The trial welds shall demonstrate to the satisfaction of the Engineer the procedure to be followed and the compliance of the welds to the strength requirement of the joints.
Records of welds and rivets showing the time of welding and the welder and supervisor shall be kept for major welds. Identification marks shall not be hard stamped.
The trial welds and rivets shall include specimen weld and rivet details, representative of the actual construction, which shall be done in a manner simulating the most unfavorable condition liable to occur in the particular work.
Shop drawings showing proposed methods of joining, welding, riveting, other connections, assembly and erection shall be submitted for the approval of the Engineer.