Mechanical Engineer
Location
Lemont, IL
Wage
$78,505 – $122,467/yr
Employment Type
Full-time
Posted on September 11, 2026
Location
Lemont, IL
Wage
$78,505 – $122,467/yr
Employment Type
Full-time
Posted on September 11, 2026
The Advanced Photon Source (APS) at Argonne National Laboratory is seeking a Mechanical Engineer to join the Beamline Instrumentation Group within the X-ray Science Division. The role involves providing engineering support for synchrotron radiation beamlines and contributing to the design and construction of scientific instrumentation.
At roughly $48/hr, this posting sits about 56% above the $31/hr median for welding jobs across Illinois — toward the top of a $26–$38/hr middle band drawn from 270 postings with published pay. Put another way, it pays more than about 89% of the comparable postings we have wage data for. Pay that far above local median usually comes attached to something: a harder cert requirement, travel, night shift, or overtime that isn't really optional. Worth establishing which before you accept.
Lemont, IL is a small market in our index: 2 other active welding openings alongside this one, from 2 employers. Across Illinois as a whole we're tracking 374 other active welding openings from 234 employers. With this few local postings, most welders here end up either commuting or looking at travel work. Browse welding jobs across Illinois.
Argonne National Laboratory currently has 1 other opening live in Illinois, which is usually a sign of either steady growth or steady turnover — worth asking which in the interview.
The most active employers in Illinois at the moment, by number of open welding reqs, are S&C Electric Company (15), Gerber Collision & Glass (14), and Staff on Site (13). Volume like that usually means either a genuine expansion or a staffing agency working several client sites — worth knowing which before you apply.
Within Illinois, the best-paying metros we track by median hourly rate are Chicago at $36/hr, Itasca at $36/hr, and Elk Grove Village at $34/hr. If you can relocate or commute, that spread is worth factoring in.
Pay figures are medians computed from live postings in the Welding Pros index, not from survey data, and they move as employers post. Mechanical Engineer figures were last recalculated when this page was built.