How to Braze With a Mig Welder

MIG brazing is a relatively new application of MIG welding technology.

Preparation

MIG brazing joins metal by filling a gap between the pieces without altering the parent metal.MIG brazing joins metal by filling a gap between the pieces without altering the parent metal.
It is commonly used to join two pieces of high strength, heat treated steel. Because MIG brazing joins the steel sheeting using a much lower temperature than MIG welding, the brazing technique will not remove the treated metal's anti-corrosion properties or weaken the surrounding steel. However, since this method does not fuse the parent metals, the joint from the MIG brazing is not as strong as traditionally welded joints.

Arrange the pieces of metal that you wish to join.

Place a 1mm spacer between the pieces to be joined so that there is a small, even gap along the brazing seam.

Clamp the pieces so that they remain stationary during the brazing process.

Clean any debris from the edges to be joined with a wire brush.

Feed the copper-silicone MIG wire into the MIG welding gun.

Join the Metal

Set your MIG welding gun to the lowest voltage setting but use faster wire feed speed setting.

Angle the brazing tip 45 degrees from vertical with the tip of the welding wire pointing forward.

Slowly push the welding tip forward in a straight line, filling the gap with the weld bead.

Continue the brazing until you completely join the pieces.

Things You Will Need

  • 1mm spacers
  • clamps
  • wire brush
  • MIG welding machine
  • copper-silicone (CuSi3) MIG wire
  • welder's mask
  • welding gloves

Warnings

  • Always wear a welder's mask and gloves while welding.
  • Weld in a well ventilated area.

About the Author

Kevin Owen has been a professional writer since 2005. He served as an editor for the American Bar Association's "Administrative Law Review." Owen is an employment litigator in the Washington D.C. metropolitan area and practices before various state and federal trial and appellate courts. He earned his Juris Doctor from American University.