Annex B Terms and Definitions

(This Annex is not a part of AWS D3.6M 1999, Specification for Underwater Welding, but is included for information purposes only.) The terms and definitions in this glossary are unique to underwater welding and applicable to this specification. ambient pressure. Pressure of the environment surrounding the welding arc. arc-dry. A condition in which the welding arc and any shielding gas are separated from the aqueous environment by a mechanical barrier. arc-wet. A condition in which no mechanical...

Class O Welds

The requirements of this section apply to Class O welds. Class O underwater welds are intended to meet the requirements of some other code or specification designated by the Customer. Class O welds shall also meet the requirements identified in this section. 10.1.1 Welding procedure specifications for Class O welds shall be qualified in accordance with the general requirements of section 5, Parts I and II, and the specific requirements of Part I of this section. 10.1.2 All welders, including...

Annex E References

(This Annex is not part of AWS D3.6M 1999, Specification for Underwater Welding, but is included for information purposes only.) The following documents may be referred to for additional information concerning diving, construction standards, welding, and testing. (1) ANSHASME Boiler and Pressure Vessel Code, American Society of Mechanical Engineers, New York, NY (2) A Pi RP 2A, Recommended Practice for Planning, Designing, and Constructing Fixed Offshore Platforms, American Petroleum Institute,...

Class A Welds

The requirements of this section apply to Class A welds. Class A defines a set of requirements for underwater welds that are intended to be suitable for structural applications involving design stresses comparable to similar above-water applications. This class of weld will meet the Customer's requirements for a particular structure and shall satisfy the requirements of this specification for Class A welds. 7.1.1 Welding procedure specifications for Class A welds shall be qualified in...

Axis Of Weld Horizontal

Figure 5.5 Positions of Test Plates for Fillet Welds 5.8.63 Position PG (3F Down) or PF (3F Up) Vertical. The plates are placed such that each fillet weld is deposited with its axis approximately vertical. See Figure 5.5(C). 5.8.6.4 Position PD (4F) Overhead. The plates are placed such that each fillet weld is deposited on the underside of a horizontal surface and against a vertical surface. See Figure 5.5(D). 5.8.7 Pipe Fillet Welds. In making tests to qualify fillet welds, test pipes shall be...

C2 Classification and Design of Welded Connections

The categorization of welds for underwater welding posed several questions for the D3B Subcommittee on Underwater Welding, including whether to categorize welding by the different processes or procedures used to produce the weld or to establish levels of quality reflecting the mechanical and physical properties achievable with underwater welding processes. The subcommittee ultimately chose the latter criterion as having the most meaning to the user community. For the majority of underwater...

Class B Welds

The requirements of this section apply to Class B welds. Class B underwater welds are intended for less critical applications where lower ductility, moderate porosity and other larger discontinuities can be tolerated. This class of weld shall meet the requirements of this specification for Class B welds, and shall satisfy the Customer's requirements for a particular application. 8.1.1 Welding procedure specifications for Class B welds shall be qualified in accordance with the general...

Workmanship

All welds produced in accordance with this specification shall be examined using the criteria specified for the particular weld class. This requirement is met when the results of all required examinations are submitted to and accepted by the Customer. 3.2.1 Corrosion pits or other discontinuities that would adversely affect the integrity of the weld shall be repaired. When repair by welding is required, the welding procedure shall be qualified to the specification requirements of 5....

Test Weld

PIPE INCLINED FIXED 45 5 AND NOT ROTATED DURING WELDING. G TEST POSITION H-L045 6G VERTICAL UP H TEST POSITION H-L045 6GR VERTICAL UP T-, Y- OR K-CONNECTIONS Figure 5.4 Continued Positions of Test Pipe or Tubing for Groove Welds plane. The pipe shall not be rotated during welding. See Figure 5.4 C . 5.8.5.4 Position H-, J-L 045 6G down or H-L 045 6G up Pipe Inclined Fixed. The pipe shall be inclined at 45 degrees with the horizontal. The pipe shall not be rotated during welding. See Figure 5.4...

Chicago Underwater Welder

Test weld to be made with a single pass. 2. Sample to be bent with the lace in tension. 3. Sample is to be supported at each end with a slowly applied force P applied at the center three point bending . 4. Bending is to proceed until the sample has a permanent bend angle of 20 degrees minimum. 5.18.2 Bend specimens shall be tested in accordance with the requirements of 5.11.3. 5.18.3 Fillet-weld specimens shall be tested in accordance with 5.11.6, 5.11.7, and 5.11.8, as applicable. 5.18.4...

Class C Welds

The requirements of this section apply to Class C welds. Class C underwater welds are intended for applications where the load-bearing function is not a primary consideration. Fillet welds are the only type of Class C weld addressed in this specification. 9.1.1 Welding procedure specification for Class C welds shall be qualified in accordance with the general requirements of section 5, Part I and II, and the specific requirements of Part I of this section. 9.1.2 All welders, including tack...

F H H

Plate qualifies for welding pipe or tubing over 610 mm 24 in. in diameter. 2. Qualifies for fillet and groove welds in all positions except for complete joint penetration groove welding of T-, Y-, and K-connections. 3. See 5.9.2 and Part I of sections 7 through 10 for requirements. 4. Positions of welding F flat, H horizontal, V vertical, OH overhead. 5. Positions as defined in 5.8. 1. Plate qualifies for welding pipe or tubing over 610 mm 24 in. in diameter. 2. Qualifies for fillet and...

List of Tables

5.1 Welding Variables Dry Welding by Shielded Metal Arc, Gas Metal Arc, Flux Cored Arc, Gas Tungsten Arc, and Plasma Arc Welding 5.2 Welding Variables Wet Welding by Shielded Metal Arc or Flux Cored Arc 5.3 Depth Limitations for Qualification 5.4 Procedure Qualification Type and Position 5.5 Positions for Welder 5.6 Pipe Diameter Groups for Welder 7.1 Weld Procedure Qualification Number and Type of Test Specimens for Class A Welds 58 7.2 Weld Procedure Qualification Mechanical Test Acceptance...

Foreword

This Foreword is not a part of AWS D3.6M 1999, Specification for Underwater Welding, but is included for information only. In 1975, the AWS Committee on Marine Construction requested the Subcommittee on Underwater Welding to establish a standard reflecting state-of-the-art technology relative to underwater welding. The first edition of the specification was published in 1983, with subsequent editions issued in 1989 and 1993. This current edition is presented in the same format as the 1993...

Specification for Underwater Welding

AWS Committee on Welding in Marine Construction Subcommittee on Underwater Welding Under the Direction of AWS Technical Activities Committee This specification covers the requirements for welding structures or components under the surface of water. It includes welding in both dry and wet environments. Sections 1 through 6 constitute the general requirements for underwater welding while sections 7 through 10 contain the special requirements applicable to four individual classes of weld Class A...

Personnel

AWS D3 Committee on Welding in Marine Construction AWS D3 Committee on Welding in Marine Construction Massachusetts Institute of Technology Tri State Steel Construction, Incorporated AWS D3B Subcommittee on Underwater Welding AWS D3B Subcommittee on Underwater Welding R. D. Holdsworth, Chair E. L. Von Rosenberg, 1st Vice Chair P. T. Delaune, Jr., 2nd Vice Chair L. P. Connor, Secretary C. L. Anderson K. Berard B. Brown G. M. Cain J. Couch S. T. Cullen F. Dyhrkopp J. Grantham A. Griggel C. E....