BS 4677:1984

Section one. General
1 Scope
2 Information and requirements to be agreed and to be
    documented
3 Parent metal
4 Condition of pipes before welding
5 Weld metal
6 Gases for shielding and purging
7 Equipment
8 Welding processes
9 Backing rings
10 Joint preparation
11 Proximity of welds
12 Fusion faces
13 Assembly for welding
14 Purging
15 Damage to parent metal
16 Inter-run cleaning
17 Cold pull
18 Pre-heating
19 Continuity of welding
20 Heat treatment after welding
21 Temperature measurement
22 Transition joints between dissimilar metals
Section two. Butt joints
23 General
24 All types of butt joint
25 Segmental bends
Section three. Branches and small bore connections
26 General
27 Branches
28 Small bore connections
Section four. Socket-welding fittings
29 General
30 Socket joint details
Section five. Reinforcement of welded branch
                connections (compensation)
31 General
32 Preparation and assembly
33 Welding procedure
Section six. Structural attachments
34 General
35 Welding procedure
Section seven. Flanges
36 General
37 Welding neck flanges
38 Plate flanges
Section eight. Inspection
39 Requirements for visual examination of completed
    welds
40 Non-destructive testing
41 Fault limitations
Section nine. Rectification of faulty welds
42 Removal of faults
43 Preparation for re-welding
44 Re-welding
Section ten. Welding procedure approval
45 General
46 Attachments to thin pipes and branch welds
Section eleven. Welder approval
47 General
48 Attachments to thin pipes
Appendices
A Grades of steel in British Standards
B Guidance on suitable types of weld metal
C Typical joint preparations
D Guidance on welding transition joints between
    ferritic steel and austenitic stainless steel
E Image quality indicator sensitivities
Tables
1 Parent metals
2 Methods of making root runs in butt joints
3 Bore difference and alignment
4 Penetration of root bead
5 Defect limits
6 Grades of steel in British Standards
7 Guidance on types of weld metal for welding similar
    austenitic stainless steel
8 Guidance on types of weld metal for welding
    dissimilar steels
9 Types of weld metal given as guidance in tables 7
    and 8 and British Standard electrode and filler
    metal designations where they exist
10 Image quality indicator sensitivities (types I and II)
Figures
1 Permissible types of permanent backing ring
2 Types of backing ring not permissible
3 Permissible types of temporary backing ring
4 Example of proximity of attachment weld
5 Segmental bends
6 Socket joint details
7 Welding neck flange
8 Typical butt joint preparations for use with metal-
    arc welding, with backing ring for single or double
    root run
9 Typical butt joint preparations for use with metal-
    arc welding, without backing ring
10 Typical butt joint preparations for use with manual
    TIG welding, with or without filler wire
11 Typical butt joint preparation for use with TIG
    welding for the root run, with or without filler
    wire or with fusible insert
12 Typical preparation and assembly of set-on right
    angle branches without backing
13 Typical preparation and assembly of set-on sloping
    branches without backing
14 Typical preparation and assembly of set-in branches
    (access from inside pipe)
15 Typical preparation and assembly of set-on right
    angle branches with temporary backing
16 Typical preparation and assembly of set-on sloping
    branches with temporary backing
17 Typical set-on connection
18 Typical small bore connections
19 Typical 'face and back' welded-on flanges
20 Typical 'bore and back' welded-on flange
21 Typical 'bore and back' welded-on flange for
    positional welding
22 Typical 'face and fillet' welded-on flange
23 Typical 'bore and fillet' welded-on flange
24 Typical 'bore and fillet' welded-on flange for
    positional welding
25 Typical 'slip on' welded-on flange
26 Typical 'slip on' hubbed welded-on flange
27 Typical 'face and fillet' hubbed welded-on flange

Arc welding using manual, semi-automatic or automatic processes; parent metals, welding consumables, preparation for welding; butt joints, branches, attachments, flanges; inspection, fault limitations; procedure and welder approval.

This British Standard specifies requirements for both shop and site arc welding, using manual, semi-automatic, automatic and mechanized welding processes or combinations of these, of joints in austenitic stainless steel pipework intended to carry fluids.

In addition to the definitive requirements, it also requires the items detailed in clause 2 to be documented. For compliance with this standard, both the definitive requirements and the documented items have to be satisfied.

NOTE The titles of the publications referred to in this standard are listed on the inside back cover.