@Izzy78 - I would have to think that their type of certification depends exactly on what type of job they are doing.
There are some types of welding that can be considered high hazard jobs and these always pay a lot of money and require quite a bit of certification in order for the person to be employed in that position.
In reality there are all kinds of jobs that require a welder and I am sure that the certification and pay all vary depending on the particular job and position at hand.
I know that there are welders in the armed forces as well as on oil rigs and those types of jobs pay a whole lot of money, but also require people to be highly certified.
I have to wonder if anyone knows anything about these types of welders on oil rigs and in the military and could shed some details on this part of the profession?