1 Scope
This International Standard specifies requirements for resistance spot welding in
the fabrication of assemblies of uncoated and metallic coated low carbon steel, comprising
two or three sheets of metal, where the maximum single sheet thickness of components
to be welded is within the range 0,4 mm to 3 mm, for the following materials:
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— uncoated steels;
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— hot-dip zinc or iron-zinc alloy (galvannealed) coated steel;
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— electrolytic zinc, zinc-iron, or zinc-nickel coated steel;
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— aluminium coated steel;
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— zinc-aluminium coated steel.
This International Standard is applicable to welding of sheets of the same or dissimilar
thickness, where the thickness ratio is less than or equal to 3:1. It applies to the
welding of three thicknesses, where the total thickness is less than or equal to 9 mm.
Welding with the following types of equipment is within the scope of this International
Standard:
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a) pedestal welding equipment;
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b) gun welders;
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c) automatic welding equipment where the components are fed by robots or automatic feeding equipment;
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d) multi welders;
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e) robotic welders.
Information on appropriate welding equipment is given in Annex A, and information on spot welding conditions is given in Annex B. This information is provided for guidance only.
Depending on the service conditions of the fabrication, the type of welding equipment,
the characteristics of the secondary circuit, the electrode material, and the shape,
it is possible that certain modifications are necessary. In such cases, further information
can be obtained from the relevant application standard, where one exists.
The welding of organic coated or primer coated steels is not within the scope of this
International Standard.