Welding polyurethane foam-filled parts can produce toxic gases. Welding should not be attempted on parts filled with polyurethane foam. If repair by welding is necessary, the foam must be removed from the heat-affected area, including the residue, prior to welding.

 This is a hazardous procedure. The hazard to the worker is due to the toxic gases generated by the thermal breakdown of the polurethane foam. The gases that eveolve from the buring foam depend on the amount of oxygen available. Combustion products of poplyurethane foam in a clean, hot fire with monoxide and traces of hydrogen cyanide.

Remember - all residue must be cleaned from the metal prior to welding.

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