There are different job classifications but that job gets paid that amount.
Here’s what it would look like if you were to put it into a job classifications:
Welder I - Usually an entry level position with basic job description.
Welder II - Second level position with expanded job description from Welder I.
Welding III - Third level position with expanded job description from Welder II.
Welding Lead - Senior position with expanded job description from Welder III.
Welding Supervisor - Oversees welders.
John has 10 years experience and he is hired as a Welder II. Sally has 3 years experience and she’s hired as a Welder II. They do the same job duties. They are paid the EXACT same salary.
Mark is hired. Mark only has 1 year experience. He is hired as a Welder I. He has fewer responsibilities than John and Sally. He makes less than John and Sally.
Georgia has 20 years experience. She is hired as a Welder I. She makes the EXACT same as Mark. She also makes less than John and Sally.
Helen is hired as the Welding Supervisor. She has no welding experience. She makes more than John, Sally and Mark.
Equal work for equal pay.