What Is GMAW-P?
GMAW-P is a modified spray transfer process, which continuously propels drops of molten metal across the arc. In pulsed spray transfer, the power source rapidly switches the welding output from high peak current to low background current. The peak current pinches off a spray-transfer droplet and propels it toward the weldment for good fusion. The background current maintains the arc but is too low for metal transfer to occur. With no metal transfer, the weld puddle gets a chance to cool. There are several benefits of GMAW-P, compared with older GMAW technology, including: • faster travel speeds (compared to GMAW short circuit transfer (SCT)); • higher deposition rates and deposition efficiency (compared to GMAW SCT); • reduced spatter for less clean-up time (compared to GMAW SCT); • minimized distortion (compared to standard GMAW spray transfer); • flexibility to weld thick or thin sections; • lower fume emissions; and • all-position welding. Limits of older control technologies GMAW t
