CUSi-3 MIG Brazing Wire - SafraBraze

The SafraBraze range of CuSi-3 MIG brazing wires has already been established in the UK for over 10 years with some of the leading automotive manufacturers. The consistent quality of this product has now become widely respected in the industry, being manufactured in Germany to EN 10204 (DIN 50049). Available not only in 5kg and 15kg spools, but also in 200kg bulk pack variety for unbeatable wire feeding on robotic applications.

Buying quantities? Call us free for a quote on 0800 975 9710. Due to volume sold of this quality product we have the best prices in the UK.

Questions and answers;

Q - Why is Manganese boron steel used so heavily in the automotive industry today?

A - In the automotive industry the need to save weight, while at the same time meeting increasingly severe crash test standards, has led to the use of high strength steels that conserve good ductility and formability. The high yield strength makes this material particularly suited for ant intrusion functions i.e. fender beams, door reinforcements, middle posts etc. This sheet steel is pre-aluminised to protect the metal from oxidation and decarburisation, during heat treatment; this also enhances the corrosion resistance after painting, avoiding the need for any subsequent corrosion protection treatment.

Q - What are the benefits of MIG brazing or MIG Soldering these Boron steels?

A - Zinc, in the galvanised coating, melts at temperatures of around 420 C and vaporises at 906 C. This causes unfavourable effects on the welding process as unalloyed SG2 MIG welding wire melts around 1450 C. The zinc starts to vaporise as soon as the arc is struck; zinc vapours and oxides can lead to pores and inadequate fusion. Zinc, in the galvanised coating, melts at temperatures of around 420 C and vaporises at 906 C. This causes unfavourable effects on the welding process as unalloyed SG2 MIG welding wire melts around 1450 C. The zinc starts to vaporise as soon as the arc is struck; zinc vapours and oxides can lead to pores and inadequate fusion. An alternative is to use the MIG Brazing process, some industries call this MIG Soldering, this is done using a copper silicon alloy MIG brazing wire - Safrabraze CUSi-3. This has a relatively low melting point approx 980 C. The reduced heat input results in the following advantages:

• low coating burn off
• no corrosion to the joint seam
• low distortion
• dissimilar joints (any combination of material, except aluminium)
• easy after joint machining
• fast deposition saving labour costs
• minimal spatter Since there is no fusion of the base metal, it therefore has more in common with a brazed joint than a welded one.

Did you know this product can now be used for TIG Brazing with the new Masterweld Autofeed AWT300? This new brazing process is taking the market by storm, has numerous benefits over MIG brazing. Want to find out more? Call our technical helpline on 0800 975 9710.