... 500MPa high strength steels,welding in cars,building,bridges SG2 copper coated co2 welding wire AWS ER70s-61) welding wire ... 0mm,1.2mm,1.6mm,2.0mm4) weight per spool/roll: 4.5kg,4.7kg,5kg,15kg,18kg,20kg5) package: ... one spool/roll into a carton,then on palletGB/T ER50-6 DIN ... oil,rust,water etc from the work parts SG2 copper coated co2 welding wire AWS ER70s-6 factory