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: $63,107
2005: $52,728
2000: $41,734
1995: $38,315