Most mound ceremonial centers are built near rivers and lakes. Mound builders lived in small communities of families led by elders. They made pilgrimages to the closest ceremonial centers to make offerings to their gods and to bury their loved ones. The ceremonial centers were built on timbers, often with a temple for sacrifices on top and crypts to bury the dead underneath.
There are many different factors that may determine welding sequence. Of course, a 1G weld is defined as a Flat (1) Groove (G) weld and the 1G is usually used when describing the position of welding any flat material such as bar, sheet, or plate. The thickness of the material may affect sequence.
The major difference between Mig and Tig welding is that one process uses a continuously feeding wire (MIG) and the other you use long welding rods and slowly feed them into the weld puddle (TIG). MIG and TIG welding both use an electric arc to make the weld. MIG welding is a very simple and easy process to learn compared to learning how to TIG weld. The technical names for these are metal inert gas (MIG), and tungsten inert gas (TIG).