There are several levels of welding, and all of these levels get their certification. The highest level of welding is 6G, meaning the company can weld at 360 degrees around a pipe that doesn’t move. Doing this high level of welding is difficult for beginners, and only a skilled and experienced welder can produce good results from this method. The 6G certification is often considered the gold standard of welding, and only the best companies can do it right.