BS ISO 18785-4:2018 specifies the requirements for the content of welding procedure specifications for the Friction Stir Spot welding (FSSW) of aluminium.Cross References:ISO 18785-5ISO 14271ISO 18785-1ISO 14272ISO 14270ISO 14273ISO 10447ISO 17653ISO 18785-3All current amendments available at time of purchase are included with the purchase of this document.