11.7 Stud Welding causing Scorching to beam

A huge amount of heat is generated by the welding process with temperatures in excess of 1400 °C. Paint on underside of flanges <12mm thick will inevitably exhibit scorching to some extent in the area immediately below each stud location – Refer image 11.7a

For beams >12mm thick, scorching may still be evident although it will be less prolific as beam flange thickness increases.

Dependent on project specification, touch-up or repair of the area may be required. This should be undertaken by the contractor responsible for the paint coating of the steel frame. Where intumescent paint is applied off-site, this may expand locally below each stud location. It is generally accepted that, provided the surface of the finish remains intact, no remedial action is required subject to the paint manufacturers approval and project specification.

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