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MIG Copper Brazing Wire CuSi3 1.2mm 4kg Spool (C9)

£105.00 ex VAT

Further Reductions Available On Request 01276 505012

  • C9 CuSi3
  • Copper MIG Brazing Wire
  • 1.2mm 4KG Spool
SKU: 6031100440 Categories: ,



BS 2901 1990 Pt3 C9 CuSi3

A 4kg single spool of 1.2mm Copper MIG brazing wire (CuSi3).  Precision wound wire, constructed from Silicon (3%) and manganese (1%) and copper (balance).  Perfect for vehicle repair, brazing wire has a low melting point to reduce heat transfer in the weld zone and hence limits warping and burn through of thin bodywork panels.  CuSi3  also allows joining of dissimilar, galvanised and high strength steels, commonly used in vehicle construction.

Use this MIG wire for joining copper, bronze, brass and other base materials of similar composition.  In addition, Due to the unique chemical composition of this product it is highly resistant to the effects of corrosion, which increases longevity of the finished join.

Furthermore, Copper brazing wire has excellent mechanical properties. Such as high tensile and shear strength, as a result they can withstand significant forces without failing, breaking or compromising structural integrity.  This wire has a lower melting point which as a result produces minimal fumes and smoke during the brazing process.  Making it a safer option for operatives and the working environment.

  • 0.8mm – Available in 1kg and 12.5kg Packs.
  • 1.0mm – Available in 1kg, 4kg and 12.5kg Packs.
  • 1.2mm – Available in 1kg and 4kg Packs.

Alternative Pack Sizes Offered – Please enquire for price and availability.


Suitable for all welding positions (see below).  The key benefits include excellent corrosion resistance even in harsh environments.  Good mechanical properties which provides high tensile and shear strength ensuring resistance to the possibility of cracking or failing. Lower melting point resulting in the reduced production of unwanted fumes and smoke. Conforms to the standard BS 2901 1990 Pt3C9. Constructed from 3% Silicon, 1% Manganese and the balance of Copper.



C9 Copper Silicon MIG Brazing Wire - Welding Positions


Copper MIG Brazing Wire is used in a wide range of industrial settings which includes -:

Automotive – Particularly beneficial where there is a requirement for joining zinc coated steel.  It is also used for the repairing of collision damaged vehicles.

Construction – Because of it’s ability to withstand high levels of stress, resistance to corrosion and durability it is often a preferred option where these factors are crucial.

Artistic Foundries – Copper MIG Brazing Wire is often chosen in artistic foundries, this is due to it’s excellent colour matching capacity.

Because of it’s excellent mechanical properties this brazing wire is also commonly used in light fabrication and manufacturing.


C9 Copper Silicon MIG Brazing Wire - Chemical Analysis


C9 Copper MIG Brazing Wire CuSi3 - Mechanical Properties

Brazing Vs Welding

The first key difference between brazing and welding is in brazing the base materials being joined are not melted, only the filler wire. Conversely in the welding process the base materials are penetrated. This reason being that during the welding process temperatures reached are higher than the base materials melting point.  In brazing it is the opposite, temperatures reached are lower than the melting point of the base materials thus avoiding penetration.

While there is no need to change the consumables in your torch when brazing or welding, there maybe a requirement for changing the settings on your welding machine e.g. voltage control, wire feed speed and/or gas cylinder settings in order to accommodate any differences encountered when using brazing filler material.

Shielding Gas: Pure Argon

TIG Welding Current DC: =+

Wire images are for illustration purposes only.

Please allow 2-3 working for delivery.


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