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.
TIG-Gas Tungsten Arc Welding (GTAW). Gas Tungsten Arc Welding, commonly called TIG or Heliarc, is a welding process that uses a non-consumable tungsten electrode to heat the base metal and to create a molten weld puddle.
Today, however, GTAW isn't the only option, even for thin, heat-sensitive material. Gas metal arc welding (GMAW) process developments have perfected the technology so it can weld extremely thin material (see Figure 1). Historically, if GMAW were to weld heat-sensitive metal at all, conventional dip-arc, or short-circuiting, GMAW was the best option.