Semi-structural welding of reinforcement should only be carried out by firms that have achieved certification to CARES Appendix 10 Quality and operations assessment schedule for the manufacture of preassembled welded fabrications using welded semistructural
and/or structural joints28.
Tack welding on site should not be permitted, other than in particular circumstances for which special approval must be sought. Only firms that have achieved certification to CARES Appendix 6 Quality schedule for the tack welding of reinforcing steel28, should be permitted to undertake contracts to supply pre-assembled tack welded fabrications. Where tack welding is proposed for reinforcement with a Carbon Equivalent greater than 0.42, the appropriate procedures in BS EN 101127 must be followed.