AWS Releases New Edition of D3.6M, Underwater Welding Code

By John Douglass

A new edition of the D3.6M, Underwater Welding Code was recently published and includes numerous updates. The internationally recognized code for the welding of structures underwater in both wet and dry environments was first published in 1983 and is currently in its 6th edition.

The 2017 edition includes the following changes:

  • The clauses have been renumbered to align with standard AWS format. In general, the clauses have been shifted by two. For example, Qualification used to be Clause 5 and now it’s Clause 7.
  • Cleaning requirements have been better defined (5.11).
  • Acceptance of still-valid qualifications to previous editions of D3.6M has been incorporated (7.1.3).
  • The use of ultrasonic stress relieving has been added as an option under Workmanship. Ultrasonic stress relieving is a process in which ultrasonic energy is used to impart compressive residual stress into a weld joint and base material mitigating harmful tensile stresses.
  • The ultrasonic examination (UT) procedure in Clause 8, Inspection, has been updated to better align with the technique described in AWS D1.1/D1.1M, Structural Welding Code—Steel.
  • Some sample forms in Annex A have been updated.
  • An informative annex has been added to address the qualification of marine welding inspectors (Annex E).

The new edition of D3.6M, Underwater Welding Code is now available at the AWS Bookstore. Members receive a 25% discount on this and other AWS products so consider joining today. See the AWS Membership webpage for more details.

The AWS D3B Subcommittee on Underwater Welding is already at work on the 7th edition revision. If you have any comments for improvement of D3.6M, or are interested in joining the committee, please contact the Secretary, AWS D3B Subcommittee on Underwater Welding at