specification for Soudronic group welder
General information
Any commercially available "E Cu wire with high conductivity" can be used for welding in
Soudronic welding machines. Based on many years’ experiences, Soudronic
recommends the use of wire to the following specifications, to avoid wire-related
difficulties.
Material properties of the semi-finished copper
High-purity copper is used in the electrotechnical industry as conductive copper.
E-Cu with oxygen content, or oxygen-free OF-Cu with an electrical conductivity in the soft annealed state of at least 58.0 m/Ω mm2.
- Copper E-Cu ≥ 99.90%
- Oxygen O2 max. 0.040%
- Copper OF-Cu ≥ 99.95%
- Oxygen O2 max. 0.0015%
Properties of the material as delivered
Electrical properties (at 20 °C)
- Max. specific resistance Ω mm2/m 0.01739
- Min. conductivity m/Ω mm2 57.5
Strength
- Yield strength, Rp. 0.2 N/mm2 min. 180
- Tensile strength, Rm N/mm2 245 – 285
- Elongation at fracture, A % 22 – 28
Surface finish
Wires for WIMA and SUPERWIMA welding must be drawn to a smooth surface finish. These wires must be free
of surface defects which could impair usability in the welding machine.
The copper wire should be clean and bright with a surface free of oxidation. Process residues from drawing
deposited on the wire must have no detrimental effect on the wire’s contact properties.
Special recommendations for copper-wire diameters
We recommend the use of Ø 1.38 mm wire for:
-can-body diameter greater than Ø 105 mm
-can-body heights greater than 180 mm (aerosol)
-sheet thicknesses greater than 0.20 mm
-welding speed greater than 85 m/min
With sheet thickness greater than 0.25 mm, we recommend the use of Ø 1.50 mm wire.
If you use Ø 1.24 mm wire the profile width is 1.84 mm, in conjunction with a roller head
groove depth 0.30 mm.
Wire profile
Standard wire profile
Packaging and storage
Bright copper wire is not especially resistant to corrosion and must therefore be protected
against corrosion, particularly in storage.
Store the copper-wire containers (drums) in a dry room to avoid all exposure to moisture.
Exposure to moisture can also result from temperature differences or from unpacking the
goods too soon after arrival.
The wire must be coiled clockwise in the drum and must be free of tension and kinks. When
welding is in progress the wire must unwind smoothly from the drum without looping at a rate
suitable for process speeds up to 150 m/min