BS 4204:1989

Foreword
Committees responsible
Specification
1. Scope
2. Definitions
3. Items for agreement between the manufacturer and
     the purchaser
4. Parent metal
5. Sizes of tube
6. Tube preparation
7. Cleanliness
8. Backing gas
9. Welding equipment
10. Welding sequence
10.1 Overhang
10.2 Clamping force
10.3 Alignment
10.4 Initial tube end squaring
10.5 Pre-heating
10.6 Flashing
10.7 Upsetting
11. Post-weld heat treatment
12. Procedure approval tests
12.1 General
12.2 Number of tests
12.3 Changes affecting approval
12.4 Heat treatment
12.5 Test specimens
12.6 Dimensions of bend test specimens
12.7 Examination of the bend test specimen
12.8 Macro-examination
12.9 Tensile testing
12.10 Hardness testing
12.11 Monitoring
13. Production control
13.1 Frequency of tests
13.2 Test procedure
13.3 Repeat tests
13.4 Parameter changes
13.5 Monitoring
14. Weld profile
15. Weld imperfections
16. Weld dressing
17. Non-destructive testing of production welds
18. Statement of results
Appendices
A. Welding equipment
B. Typical information to appear on a welding procedure
    sheet for flash welding
C. Generalized diagram illustrating monitoring variables
D. Weld records
Figures
1. Tube preparation
2. Method of cutting bend test specimens from the test
    weld
3. Length of weld surface opened up during the bend
    test
4. Dimensions of the tensile test specimens
5. Tube fault revealed as a result of a bend test
6. Large void revealed as a result of a bend test
7. Lack of adhesion revealed as a result of a bend test
8. Flat spot revealed as a result of a bend test
9. An example of break-up in the heat affected zone
10. Typical flash welding procedure test record
11. Typical flash welding procedure test report sheet
12. Generalized diagram illustrating monitoring variables

Automatic flash welding of steel tubes, pipes or pipe fittings. For sections other than those covered by this standard, see BS 6944.

This British Standard specifies requirements for the automatic flash welding of steel tubes, pipes or pipe fittings for pressure applications.

In addition to the definitive requirements, it also requires the items detailed in clause 3 to be documented. For compliance with this standard, both the definitive requirements and the documented items have to be satisfied.

NOTE 1. The phrase ‘pressure applications’ in this context applies to designs incorporating pressure and/or temperature requirements.

NOTE 2. For sections other than those covered by this standard, see BS 6944.

NOTE 3. The titles of the publications referred to in this standard are listed on page 17.