A new photo is not MANDATORY.. see this link and quote below:
https://www.aws.org/certification/page/photo-id-requirementsRenewals/Recertification - Change of Appearance
If you cannot be identified from your current photo on file with AWS, you should submit a new photo with your renewal or recertification application.
Examination results will NOT be released until we receive the 2 x 2 inch color passport - style photograph. To avoid delays in receiving your examination results, please mail your photo to the address listed below:
American Welding Society
Certification Department Photo Center
8669 NW 36 Street, Suite 130
Miami, FL 33166-6672
We recommend using priority mail with tracking options.
For question or concerns, please call the Certification Department 800-443-9353, extension 273.