I worked in an oil refinery for about a half year (turnarounds). Turnarounds involved shutting down one part of the refinery for rebuilding and repairs. A lot

I worked in an oil refinery for about a half year (turnarounds). Turnarounds involved shutting down one part of the refinery for rebuilding and repairs. A lot of the work involved pipe welding. Pipe welding pays extremely well (for a trade) and that's because it requires such consistently high performance. As a pipe welder, you have to stamp your name into every weld you do. If your weld fails, it could kill people. They check pipe welds using an xray. If a guy's weld failed xray more than once(and usually more than 0 times), he was out of the job.