2 answers
Charles’s Answer
You will need to be more specific. Welding is a broad category. Underwater pipe welding versus ship or pipe welders... the salaries will vary.
The American Welding Society has a page that cites welding salaries by state/community. It is a few years old at this point, but it should give you an idea of the range. Broadly, the answer is "about $30 an hour"... and it appears the number of jobs is growing, especially if you are willing to move to follow the work.
Sheila’s Answer
Hello Luis:
In addition to Mr. Emmons response I'd like to share with you a link on the various types of welding positions on ZipRecruiter. You could look at the type of job and compare the salary.
https://www.ziprecruiter.com/Salaries/Welder-Salary-Comparison-to-Related-Occupations
Best of Luck!
~ Sheila