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Welds and GMAW

Across
Used to join two overlapping pieces of metal
Wire welding process
Used to weld heavier peaces of metal together
Shield gas, high current density arc, deep penetration, narrow bead almost no splatter.
Used when preparing the metal before welding it into place
Used to join two pieces of metal that is approximately right angles to each other
Down
Shield gas, good transfer of heat, high spatter and requires high arc voltage, more expensive than argon
Used to join two parallel or nearly parallel pieces of metal. not very strong
Used when joining two pieces of metal without preparing the surface of the metal first
Shield gas, high thermal conductivity, high voltage, less gas required, least expensive
referred to as Metal Inter Gas welding or mig