DEFSTAN 02-706/1(2000) : 2000

Name: DEFSTAN 02-706/1(2000) : 2000
Brand: DEFSTAN

Superseded

View Superseded by

WELDING AND FABRICATION OF SHIP'S STRUCTURE

Superseded date

27-09-2010

Published date

12-01-2013

Publisher

UK Ministry of Defence Standards

TITLE PAGE
SCOPE
FOREWORD
Sponsorship
Conditions of Release
General
MOD Tender or Contract Process
Related Documents
Health and Safety
Warning
CONTENTS
SECTION 1 - MATERIALS
SECTION 2 - WELDING PROCESS AND EQUIPMENT
            2.1 Qualification Requirements
            2.2 Installation of Welding Circuits
            2.3 Capacity of Cables
            2.4 Return Leads
            2.5 DC Power Sources
SECTION 3 - WELDER QUALIFICATION
SECTION 4 - WELDING PROCEDURES
            4.1 Written Weld Procedures
            4.2 Preparation and Qualification of Welding
                Procedures
            4.3 Non-destructive Examination and Acceptance
                Standards
            4.4 Procedure Information for Fusion Welds
            4.5 Procedure Information for Stud Welds
SECTION 5 - DESIGN OF WELDED JOINTS, STRUCTURAL STEEL
            5.1 Qualification of Joint Design, Edge Preparation
            5.2 Stresses in Welds
            5.3 Abrupt Changes of Section
            5.4 Location of Welds
            5.5 Welding Position
            5.6 Welding Processes
            5.7 Butt Welds
            5.8 Backing Bars and Strips
            5.9 Joint Dimensions
            5.10 Types of Butt Joints
            5.11 Tee Butt Joints
            5.12 Fillet Welds
            5.13 Lap Joints
            5.14 Crossing of Butt Welds by Fillet or Tee
                 Butt Welds
            5.15 Plug and Slot Welds
            5.16 Tongue Welds
SECTION 6 - DRAWINGS: WELDING INSTRUCTIONS
            6.1 Preparation of Drawings
            6.2 Information to be Shown
            6.3 Special NDT Requirements
SECTION 7 - FABRICATION REQUIREMENTS
            7.1 Preparing Plate Edges
            7.2 Surface Marking
            7.3 Cleanliness
            7.4 Welding on Coated Structure
            7.5 Shaping and Forming of Plate and Sections
            7.6 Cold Work
            7.7 Hot Work
            7.8 Shaping and Forming of Weldments
                 (Containing Welds)
            7.9 Stress Relieving or Normalizing
            7.10 Quenching and Tempering
            7.11 Heat Treatment Furnaces
            7.12 NDT Requirements for Shaped Materials or
                 Weldments
            7.13 Mechanical Test Requirements
            7.14 Erection and Assembly Requirements
            7.15 Dimensional Accuracy
            7.16 Strongbacks
            7.17 Stud Welded Strongback System
            7.18 Fillet Welded Spools
            7.19 Temporary Attachments
            7.20 Misalignment
SECTION 8 - CARE AND STORAGE OF WELDING CONSUMABLES
            8.1 Studs
            8.2 Fusion Welding Consumables
            8.3 Pre-issue and Issue Requirements for Other
                than Hydrogen Controlled Welding Consumables
            8.4 Pre-issue and Issue Requirements for Hydrogen
                Controlled Welding Consumables
            8.5 Use of Reclaimed Submerged Arc Flux
SECTION 9 - WELDING REQUIREMENTS
            9.1 Selection of Welding Consumables
            9.2 Pre-heat
            9.3 Application of Pre-heat
            9.4 Pre-heating Methods
            9.5 Pre-heat Temperature Measurement
            9.6 Interpass Temperature
            9.7 Heat Input
            9.8 Weld Deposition Techniques
            9.9 Cleaning
            9.10 No Scallop Technique
            9.11 Intersecting Butt Welds
            9.12 Back Gouging
            9.13 Flushing or Weld Dressing
            9.14 Post-heat
            9.15 Buttering or Build up by Welding
            9.16 Peening
SECTION 10 - WELDING INSERTS
             10.1 Welding Process
             10.2 Welding Procedures
             10.3 Welding Consumables
             10.4 Welding Conditions
             10.5 Welder Qualification
             10.6 Materials
             10.7 Material Examination
             10.8 Size and Shape of Inserts
             10.9 Location of Inserts
             10.10 Edge Preparations
             10.11 Preparing and Erection/Fitting Requirements
             10.12 Securing of Inserts Prior to Welding
             10.13 Welding Sequences
             10.14 Sequence of Welding Frame Butts
             10.15 Non-destructive Examination and Acceptance
                   Standards
SECTION 11 - WELDING CASTINGS AND FORGINGS
             11.1 Welding Operations
             11.2 Structural Welding of Castings or Forgings
             11.3 Repair by Welding of Castings
SECTION 12 - WELDING OF PROTECTIVE PLATING
             12.1 Current Materials
             12.2 Obsolete Materials
             12.3 Stud Welding
             12.4 Non-Destructive Examination and Acceptance
                  Standards
SECTION 13 - STUD WELDING
             13.1 Stud Welding Categories
             13.2 Stud Materials
             13.3 Welding Procedures
             13.4 Welder Qualification
             13.5 Applications
             13.6 Stud Welding Requirements
             13.7 Removal of Temporary Studs or Redundant Studs
             13.8 Non-destructive Examination and Acceptance
                  Standards
SECTION 14 - REPAIR BY WELDING
             14.1 Rectification Requirements
             14.2 Welding Procedures
             14.3 Welder Qualification
             14.4 Welding Consumables
             14.5 Welding Conditions
             14.6 Location of Unacceptable Defects
             14.7 Weld Repair Types
             14.8 Non-destructive Examination and Acceptance
                  Standards
SECTION 15 - RENOVATION BY WELDING OF PITTED PLATING, SHAFT
             BRACKETS, HYDROPLANES ETC
             15.1 Applications
             15.2 Welding Procedures
             15.3 Welder Qualification
             15.4 Welding Consumables
             15.5 Preparation of Surface for Weld Reinforcement
             15.6 Welding Conditions
             15.7 Welding Technique
             15.8 Surface Finishing of the Reinforced Area
             15.9 Non-destructive Examination and Acceptance
                  Standards
SECTION 16 - WELDING AND FABRICATION OF ALUMINIUM ALLOYS
             16.1 Materials
             16.2 Welding
             16.3 Welding Processes
             16.4 Welder Qualification
             16.5 Weld Procedures
             16.6 Welding Consumables
             16.7 Preparation of Materials
             16.8 Fabrication
             16.9 Joint Design
             16.10 Erection and Assembly
             16.11 Condition of Fusion Faces
             16.12 Weather Conditions
             16.13 Pre-heating
             16.14 Electrode Wire Sizes, Welding Conditions
                   and Gas Shield Flow Rates
             16.15 Weld Repair of Weld Defects
             16.16 Non-Destructive Examination and Acceptance
                   Standards
             16.17 Shaping and Forming of Plate and Sections
             16.18 Inspection Requirements for Shaped or
                   Formed Materials
SECTION 17 - NON-DESTRUCTIVE EXAMINATION OF WELDS
             17.1 Methods
             17.2 Time Delay and Extent of Non-destructive
                  Examination
             17.3 Structural Welds
             17.4 Welded Inserts and Penetrations
             17.5 Stud Welding
             17.6 Repair by Welding
             17.7 Renovation by Welding of Pitted Plating,
                  Shaft Brackets, Hydroplanes etc
             17.8 Weld Metal Cladding
SECTION 18 - METAL CLADDING
             18.1 Areas of Application and Cladding Materials
             18.2 Base Materials
             18.3 Cladding Techniques
             18.4 Fabricator's Approval
             18.5 Welder Qualification
             18.6 Technical Requirements
             18.7 Welding Cleanliness
             18.8 Welding Consumables
             18.9 Welding Conditions
             18.10 Deposition Techniques
             18.11 Pre-heat and Interpass Temperature
             18.12 Distortion
             18.13 Interrun Cleaning
             18.14 Finished Deposits
             18.15 Rectification of Weld Defects
             18.16 Non-Destructive Examinations
             18.17 Acceptance Standards
ANNEX A - RELATED DOCUMENTS
ANNEX B - DEFINITIONS AND ABBREVIATIONS
ANNEX C - WELDABILITY OF FERRITIC MATERIALS
          C.1 General
          C.2 Crackling
          C.3 Hot Cracks
          C.4 Cold Cracks
          C.5 Hydrogen
          C.6 The Degree of Stress in the Joint
          C.7 The Crack Susceptibility of the HAZ Micro
              Structure
          C.8 Precautions to Avoid Hydrogen Induced Cracking
ANNEX D - DISTORTION
          D.1 General
          D.2 Forms of Distortion
          D.3 Factors Contributing to the Degree of Distortion
          D.4 Control of Distortion
              D.4.1 Correction of Distortion
ANNEX E - WELDING DEFECTS
          E.1 General
          E.2 Incomplete Root Penetration (Lack of Root Fusion)
          E.3 Lack of Fusion
          E.4 Inclusions
          E.5 Piping and Porosity
          E.6 Weld Metal Cracking
          E.7 Cracking in Parent Plate
          E.8 Undercutting
          E.9 Spatter
          E.10 Dimensional Defects
ANNEX F - LAMELLAR TEARING
          F.1 General
          F.2 Description
          F.3 Causes
          F.4 Welding Factors
          F.5 Notes on NDT and Weld Repair Action
ANNEX G - STATEMENT OF TECHNICAL REQUIREMENTS
ALPHABETICAL INDEX

Gives requirements for the fabrication, welding and inspection of structures and associated components produced in MOD (PE) structural materials (as defined in Section 1).

DevelopmentNote	This is a redesignation of NES 706. (01/2001)
DocumentType	Standard
PublisherName	UK Ministry of Defence Standards
Status	Superseded
SupersededBy	DEFSTAN 02-706/2(2010) : 2010
Supersedes	NES 706 : ISSUE 2 AMD 6

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DEFSTAN 02-177/2(2002) : 2002 AMD 1 2002	REQUIREMENTS FOR THE MANUFACTURE, TEST AND IDENTIFICATION FOR ITEMS OF SMITHS WORK
DEFSTAN 02-179/1(2002) : 2002	REQUIREMENTS FOR LOCKERS (MAGAZINE, RU MAGAZINE AND DETONATOR) USED FOR STORAGE OF EXPLOSIVE STORES IN HM SURFACE SHIPS AND SUBMARINES
DEFSTAN 02-339/3(2006) : 2006	REQUIREMENTS FOR STEERING AND STABILIZER SYSTEMS FOR HM SURFACE SHIPS AND ROYAL FLEET AUXILIARIES
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DEFSTAN 02-728/3(2010) : 2010	REQUIREMENTS FOR DOMESTIC HOT AND COLD FRESH WATER SYSTEMS
DEFSTAN 02-706/3(2020):2020	Welding & Fabrication of Ship Structure for HM Submarines and Ships not in Class
DEFSTAN 02-855/1(2004) : 2004	ELECTRON BEAM WELDING OF MARINE COMPONENTS - CATEGORY 2
DEFSTAN 02-136/3(2010) : 2010	DESIGN POLICY, PRINCIPLES, TESTING AND ACCEPTANCE REQUIREMENTS FOR WATERTIGHT INTEGRITY OF SUBMARINES
DEFSTAN 02-745/1(2006) : 2006	CLASSIFICATION, INSPECTION REQUIREMENTS AND ACCEPTANCE STANDARDS FOR STEEL CASTINGS

NES 745 PT 1 : ISSUE 1	CLASSIFICATION, INSPECTION REQUIREMENTS AND ACCEPTANCE STANDARDS FOR CASTING - COPPER AND NICKEL ALLOY CASTINGS
NES 791 PT 1 : ISSUE 2	REQUIREMENTS FOR WELDABLE STRUCTURAL STEELS - MILD STEEL-PLATE SECTIONS AND BARS
NES 793 : LATEST
NES 770 : ISSUE 2 AMD 2	WELDING AND FABRICATION OF Q1N HY80 AND QT35 STEEL
BS 3571-1:1985	MIG welding Specification for MIG welding of aluminium and aluminium alloys
BS 3451:1973	Methods of testing fusion welds in aluminium and aluminium alloys
NES 773 : ISSUE 1 AMD 2	WELDS - MINIMUM ACCEPTANCE STANDARD
BS CP118(1969) : 1969 AMD 1129	THE STRUCTURAL USE OF ALUMINIUM
NES 745 PT 2 : ISSUE 1	CLASSIFICATION, INSPECTION REQUIREMENTS AND ACCEPTANCE STANDARDS FOR CASTING - STEEL CASTINGS
NES 769 : ISSUE 4	WELDING CONSUMABLES FOR STRUCTURAL STEEL - APPROVAL SYSTEM
BS 3019-1:1984	TIG welding Specification for TIG welding of aluminium, magnesium and their alloys
BS 1470:1987	Specification for wrought aluminium and aluminium alloys for general engineering purposes: plate, sheet and strip
BS 1504:1976	Specification for steel castings for pressure purposes