People in this group work for construction contractors, sheet metal fabrication and welding shops, manufacturers of sheet metal and fabricated metal products, structural steel, boilers, platework, aircraft, heavy machinery and transportation equipment, sheet metal work, welding, and ironwork contractors and ship building companies.
Here are the average annual salaries.
2010: $58,510
2005: $49,109
2000: $37,623
1995: $33,619