“There are a number of career opportunities for experienced welder-divers. Industry has and will continue to demand higher quality standards for underwater welds and more certification of underwater welding systems and personnel. These demands will challenge the underwater welding community to meet more complex technical specifications, safety standards, welding criteria, inspection methods, environmental factors, and other considerations. Many welder-divers go on to become engineers, instructors, and diving operation supervisors, and superintendents fill management positions, qualify as AWS Certified Welding Inspectors (CWI), and serve as consultants for underwater welding operations and other related fields.” (© 2011 American Welding Society). (https://app.aws.org/education/plunge.html)
You have to go to the commercial diving academy to be trained. You must follow all of the physical and mental abilities of a diver. You must also follow all of the guidelines of the AWS D3.6 standard which are the standards for this