Copper Wire Technical Standards
Basic Information
Any “high-conductivity E=CU copper wire” available on the market can be used in Südrohnic welding machines. To avoid welding issues caused by the copper wire, the following technical specifications are provided for reference.
Material Properties of Semi-Finished Copper Wire
High-purity copper, such as electrical-grade copper used in the electrical industry.
Electrolytic copper (Cu) or oxygen-free copper (OF-Cu) after annealing should have a conductivity of at least 58.0 m/(Ω·mm²).
Technical Parameters of Copper Wire
Electrolytic copper (ECu): 99.90% Cu, maximum oxygen content 0.040%
Oxygen-free copper (OF-Cu): 99.95% Cu, maximum oxygen content 0.0015%
Material Characteristics at Delivery
The copper wire material characteristics should meet the requirements listed in Table 2-30.
If you want, I can summarize Table 2-30 with the specific mechanical and electrical property requirements for easy reference. Do you want me to do that?
| (1) tolerance | |||||||
| Rated diameter of circular cross-section of copper wire / mm | 1.24 | 1.38 | 1.50 | 1.60 | 1.80 | 2.00 | 2.50 |
| Cross-sectional area / mm² | 1.21 | 1.50 | 1.77 | 2.01 | 2.54 | 3.14 | 4.91 |
| Allowable diameter difference / mm | 0 / 0.04 | ||||||
| Mass per unit length / (kg/1000m) (Density is 8.9kg/dm³) | 10.7 | 13.3 | 15.7 | 17.9 | 22.6 | 28.0 | 43.7 |
| (2) Electrical characteristics (on 20) | |||||||
| Maximum resistivity /[(Ωmm2)/m] | 0.01739 | ||||||
| Minimum conductivity /[m/(Ωmm?) | 57.5 | ||||||
| (3) strength | |||||||
| Yield strengthR,,0.2/(N/mm2) | 180 | ||||||
| tensile strengthRm/(N/mm2） | 245~285 | ||||||
| Elongation A/% | 22~28 | ||||||
| (4) Surface finish | |||||||
| The copper wire used for WIMA and SUPER WIMA welding must be stretched and have a smooth and uniform surface. The copper wire must also be free of surface defects that would impair the performance of the welding machine. | |||||||
Special Recommendations for Copper Wire Diameter
For cans with a diameter greater than 105 mm, height greater than 180 mm (spray cans), tinplate thickness greater than 0.20 mm, and welding speed above 85 mm/min:
Recommended copper wire diameter: 1.38 mm
If tinplate thickness exceeds 0.25 mm, use copper wire diameter: 1.50 mm
If using 1.24 mm copper wire, the wire forming width should be 1.84 mm and the weld wheel groove depth should be 0.30 mm
Copper Wire Packaging and Storage
Bright copper wire is prone to corrosion and must be protected.
Store wire containers (drums) in dry rooms to avoid moisture.
Moisture may also result from temperature differences or opening the container too quickly after delivery.
Copper wire must be wound clockwise on the drum without tension or knots.
During welding, the wire must unwind smoothly from the drum without tangling; operational speed can reach up to 150 m/min.
Note: This copper wire technical standard was established for Südrohnic automatic resistance welding can-making machines on March 8, 2001, standard number 0620.
