CuSi3 Koronet Soldering Wire

Koronet’s CuSi3 Platinum Line brazing wire is a high-quality solid copper wire with added silicon, designed for the MIG Brazing process. This is an indispensable solution wherever traditional MIG/MAG welding could damage the protective coatings of the material or lead to thermal deformation. It is used primarily in automotive bodywork, air conditioning production and when joining thin steel sheets with zinc coating.

The binder has a much lower melting point than steel, which allows the elements to be joined without completely melting the edges of the sheets. This ensures that the galvanized layer remains almost intact, which guarantees the highest corrosion protection of the connector. The addition of silicon (Si) ensures excellent weld pool fluidity, minimal spatter and exceptional ease in subsequent mechanical processing of the weld.

CuSi3 wire is particularly recommended for joining steel sheets up to 3 mm thick, regeneration work and joining steel with copper alloys. It is the product of first choice for professional body shops striving to maintain factory anti-corrosion standards.

Product characteristics

• Specialized solid wire for MIG welding (GMAW).

• Maximum protection of the galvanized thanks to low process temperature.

• Minimal thermal deformation – ideal for thin components.

• Excellent edge wetting and smooth weld face.

• High plasticity of the binder for increased resistance to vibration and cracking.

• Easy to process – the weld seam is soft, which reduces grinding time.

Technical information

• Classification: AWS A5.7 ERCuSi-A

• European standard: EN ISO 24373 Cu 6560 (CuSi3Mn1)

• Chemical composition: Copper base (Cu) with the addition of approx. 3% Silicon (Si) and 1% Manganese (Mn).

• Melting point: approx. 910°C – 1025°C.

• Recommended shielding gas: Pure Argon (e.g. EN ISO 14175:I1).

• Polarity: DC with a plus on the handle (DC+).

Application

• Automotive bodywork: joining of body panels, sills and galvanized sheathing.

• Ventilation and heating industry: welding of galvanized sheet ducts.

• Combining materials with different names: combining copper with steel and steel with brass.

• Arts and crafts: making aesthetic joints in copper structures.