Small amounts of molybdenum greatly increase corrosion resistance. 304L and 316L are low carbon alloys developed to minimize carbide precipitation during welding which may lead to corrosion problems. 80 A ground finish produced by grinding a tube with an abrasive belt impregnated with No. 80 grit. 120 A ground finish produced by grinding a tube with an abrasive belt impregnated with No. 120 grit. 180 A ground finish produced by grinding a tube with an abrasive belt impregnated with No. 180 grit.
Heating is caused by an arc between the surface of the steel and a tungsten electrode.
The electrode is not consumed during the process, so filling metal may be needed depending on the weld. TIG welding requires a high degree of skill.