The essential guide
MIG/MAG welding is by far the most popular welding process for robots and is relatively easy to achieve provided joint fit up is within tolerance.
Many companies in the yellow goods industry (earth moving vehicles, etc) weld assemblies with thick plate and long seams. Twin wire welding can provide some productivity improvements
CMT is the now not so new process from Fronius that is gaining impact on the market for robotic welding. It is a great process if heat input is an issue.