Hard Worker (Welder)
Identical to hard-working men, class is one of the jobs that require engineering to learn it--Welders. Not just anyone can master this knowledge, even though some people underestimate it, actually there is really very heavy work on this. Not only struggling with welding fire, they are also expected to have welders very neat work.
So no wonder, even though this work was considered too easy, just a few of them had graduated from welding schools. This is some photography that I captured in one corner of our office, the hard workers are welding floors for iron stairs.