BS 1140:1993

Committees responsible
Foreword
1 Scope
2 References
3 Definitions
4 Items to be agreed between the contracting parties
5 Parent metal
   5.1 Uncoated steel
   5.2 Hot-dip zinc and iron-zinc coated steel
   5.3 Electrolytic zinc coated steel
   5.4 Electrolytic zinc-nickel coated
   5.5 Terne coated steel (nominal Pb/10% Sn coating)
   5.6 Aluminium coated steel
   5.7 Zinc-55% aluminium coated steel
   5.8 Zinc-5% aluminium coated steel
6 Surface conditions
7 Edge conditions, form of component and weld pitch
8 Electrodes
   8.1 Materials
   8.2 Dimensions
   8.3 Cooling
9 Weld assessment - General
   9.1 Procedure
   9.2 Type tests
   9.3 Routine tests
10 Weld assessment - Tests
   10.1 General
   10.2 Shear test
   10.3 Cross-tension test (optional)
   10.4 Peel test or chisel test
   10.5 Visual examination
   10.6 Metallurgical examination
   10.7 Hardness test (optional)
11 Weld assessment - Acceptance criteria
   11.1 General
   11.2 Weld dimensions
   11.3 Weld appearance
   11.4 Weld diameter
   11.5 Weld fracture mode
   11.6 Distortion
12 Routine inspection of welded components
13 Facilities for inspection
14 Testing facilities
Annex A (informative) Recommendations for spot welding equipment
Annex B (informative) Typical spot welding conditions
Annex C (normative) Typical information to appear on a welding
        procedure sheet for spot welding
Annex D (informative) Calculation of weld strength
List of references

Specifies procedures in the fabrication of assemblies of uncoated and coated low carbon steel comprising two or three thicknesses of metal where the single sheet thickness is within certain given limits.

This British Standard specifies procedures for resistance spot welding in the fabrication of assemblies of uncoated and coated low carbon steel comprising two or three thicknesses of metal, where the single sheet thickness of the components to be welded is within the following ranges:

1. uncoated sheets: 0.4 mm to 3.0 mm (see 5.1);
2. uncoated plates: 3.0 mm to 12.0 mm (see 5.1);
3. hot-dip zinc coated sheets: 0.4 mm to 3.0 mm (see 5.2);
4. hot-dip iron-zinc alloy coated sheets (galvaneal): 0.4 mm to 3.0 mm (see 5.2);
5. electrolytic zinc coated sheets: 0.4 mm to 3.0 mm (see 5.3);
6. electrolytic zinc-nickel coated sheets: 0.4 mm to 3.0 mm (see 5.4);
7. terne coated sheets: 0.4 mm to 3.0 mm (see 5.5);
8. aluminium coated sheets: 0.4 mm to 3.0 mm (see 5.6);
9. hot-dip zinc-55 % aluminium coated sheets 0.4 mm to 3.0 mm (see 5.7);
10. hot-dip zinc-5 % aluminium coated sheets 0.4 mm to 3.0 mm (see 5.8).

Guidance on the choice of appropriate welding equipment and approximate spot welding conditions is given in annexes A and B respectively.

This procedure does not apply to the welding of sheets or plates of dissimilar thickness where the thickness ratio is greater than 3 to 1.

In addition to the definitive requirements, this standard also requires the items detailed in clause 4 to be documented. For compliance with this standard, both the definitive requirements and the documented items have to be satisfied.