Silicon Bronze Brazing on Cast Iron (MIG)
September 19, 2020
This wire certainly behaves differently than steel wire. It doesn't melt the base metal, but bonds with it via capillary action. It takes a little getting used to, and will not lay down flat, but rather a domed or higher profile bead (MIG). I used it to braze a broken pot lid on cast iron, but there could be many uses for it. It does create a very strong bond, not welding, but brazing. I was trying to prevent cracking in the cast iron, so not having to melt the base metal yields a much more forgiving bond (and not initiate cracking in cast iron). I will practice with sheet metal, and you can join dissimilar metals. However, it will not result in the same tensile strength as fusion welding.
ProsBraze dissimilar metals together.
Repair cast iron, and not melt the base metal.
Works in standard MIG wire feed mechanisms.
ConsNot as strong a bond as fusion Arc Welding.