Custom Bicycles
Welding Close-up

Here’s a close-up of TIG welding the down tube to the bottom bracket shell. For the geeks, TIG stands for Tungsten Inert Gas. The brightly glowing electrode is the tungsten, which provides the arc. The inert gas is argon, which after emerging from the pinkish colored gas lens forms a protective cloud (invisible) around the heated metal to prevent oxidation and contamination.