I agree with Al as to taking an 'Endorsement Exam'. You can find them on the main part of the website here. Click on the above link for AWS Website, go to the certifications tab, in there you will find info to link to the Endorsement Exams in the center of the page in blue titled 'CWI/SCWI Endorsement Exams'. There are other links there with the info also. In fact, you will need to go to the applications, fees, schedules pages to get some of the info. It is rather scattered through the various sections. AND, you will need to look at the QC1 and other specs on the quals and specs for inspectors to see some of the info on what tests can be taken and how they apply as well as what other activities qualify.
BUT, the Bolting Exam does not count for a complete exchange of exams as does taking the API 1104, D1.6, D1.5, or others mentioned by Al. (As per Joe Kane and Certification Dept) So if you are down to the wire on time do not try for the Bolting. If you do have time, the Bolting can be a nice addition but you will have to find other things that count as your points per QC1 so you don't have to take the Part B. Check out Jim Shore's fine article in the latest 'Inspection Trends' on Five Tips to Help You Keep Your Certification. Many good points to make you more rounded and eliminate the dreaded Part B 9 yr recert exam.
You can also get some of this info in a thread in the Structural Bolting Section titled 'AWS Bolting Inspector Exams'.
Have a Great Day, Brent