some cases, that of a university materials science academic. This is in addition to learning about the many types of welding equipment and techniques that exist today. A spectrum of capabilities exists between welders and weld inspectors. Practicing welders may have more experience with the technique (holding the wire and torches just right to make an excellent weld rather than a poor one, analogously to how a musician must play a musical instrument just right, with highly practiced deftness of fine motor control, in order to produce an excellent sound rather than a poor one), but inspectors may have greater training in the metallurgy involved and greater overview knowledge of a wider range of types of welding. Many weld inspectors have been, or could quickly become, practicing welders, and vice versa, while others in each role may lack the experience or training to easily switch to the other. Machining quality assurance staff, who use equipment such as CMMs, surface plates, height gauges, and micrometers to check conformance with the GD&T-defined geometry and dimensions defined by the engineering drawing or 3D model. The skills of these staff members and of the machinists themselves overlap; some inspectors have been, or could quickly become, practicing machinists, and vice versa, while others in each role may lack the experience or training to easily switch to the other. Metallurgist, a person who assures the chemical and physical traits of the metal, whether raw mill products or semifinished or finished parts and weldments. Occupations closely related to metalworking Miner of ore or minerals Scrap processor Union representative, sometimes a practicing tradesperson doing the job part-time, other times someone doing the job full-time Truck driver, a person who drives trucks (also known as lorries) The various engineering disciplines, especially: Mechanical engineer Chemical engineer Industrial engineer Materials engineer Civil engineer Lists of occupations