[Tagging] steel worker and smaller concrete structures on site

[M∡rtin Koppenhoefer]

Hi,

some questions from a non-native (to the British, US, AU and other natives):

1. What is a steel worker?

Is it someone who works in a steel mill
http://growthexpertblog.com/wp-content/uploads/2010/04/SteelWorkerGentex_l1.jpg

or is it someone who builds structural steel work (aka the men (and
women) that built America):
http://www.ssplprints.com/lowres/43/main/19/97962.jpg


2. Smaller concrete structures

Large concrete structures are often prefabricated in the industry and
assembled on site. What about smaller structures? How do you call the
person that makes/assembles the formwork? If there is a specialist for
the concrete, what would he be called? And the one that cuts, bends
and assembles the reenforcement steel? I know that these works are
often performed by the same person, is there a generic term for this
profession? Is it typically masons doing this?

cheers,
Martin