The average welder salary at Fairfax County was $77,568 , which is 23 percent higher than the average salary for this job in Virginia, and 19 percent higher than the national average for this job . Welder salaries at Fairfax County typically range from $69,211 to $82,535 (25th to 75th percentile). The highest reported welder salary was $82,534. There are 3 employees at Fairfax County with the job title welder.