I guess it wouldn't be too good if the job only needed doing once. A lot of welders would be out of work. For some men (women, too,) welding is their life. I mean, it's all they want to do, all they think about. They wouldn't be happy if they had to choose another path. They wouldn't be happy doing anything else. For their sake, I am glad that there are plenty of people who need welding done.......on a regular basis. If there were no welding jobs to be had, there would be a bunch of frustrated welders. They would likely get up to no good, welding on the sly, welding when it wasn't necessary, maybe even welding by force! It would be pandemonium!!