On a track, the extra boost given by premium can mean a few tenths of a second difference on a lap time. In the real world, it barely affects performance, or fuel economy. Consumer Reports advises that premium should only really be used in your car if your ownerâs manual mandates it.
1 Shielded metal arc welding (SMAW) - also known as stick welding or electric welding, uses an electrode that has flux, the protectant for the puddle, around it. 2  The electrode holder holds the electrode as it slowly melts away. 3  Slag protects the weld puddle from atmospheric contamination.
Flux Core Arc Welding / FCAW. Flux core arc welding / FCAW is the same machine as the MIG welder but the difference is it either uses just the wire with a flux in the center of it or a combination of the flux in the center of the wire and a shielded gas from a bottle. On a scale of 1 to 3 for difficulty FCAW is a 2.