Bohler SAS 4 PW-FD description: Rutile, strip alloyed, flux cored welding wire with fast freezing slag providing excellent positional welding characteristics and fast travel speeds. It is easy to use and operates with a powerful penetrating spray arc transfer, minimum spatter formation and self releasing slag. BÖHLER SAS 4 PW-FD offers many economical and quality advantages over solid wire pulse arc welding. High deposition rates and productivity gains are easily achievable.