Induction Brazing of Carbide onto a Steel Workpiece

Objective
Brazing carbide onto steel workpiece

Equipment
SM-2/200 Power Supply
HS-4W Heat Station
Ultraflex custom coil

Key Parameters
Power: 1.88 kW
Temperature: Approximately 1500°F (815°C)
Time: 14 sec

Materials
Coil-
2 helical turns (20 mm ID)
1 planar turn (40 mm OD, 13 mm Height)

Carbide-
13 mm OD, 3 mm wall thickness

Steel piece–
20 mm OD, 13 mm ID

Process:

To demonstrate elimination of “hand feeding” the alloy, we formed the alloy into a ring to tightly fit over the center post tube. This method provides a uniform amount for each cycle, resulting in uniform joints and wetting.
The custom made coil was then placed over the steel piece, where is was set for 14 seconds to heat the alloy.
The alloy was heated at approximately 1500°F (815)°C
The whole piece is left alone and cooled with ambient air

Results/Benefits:

Brazing was successful all in under 20 seconds with 2-kW
High quality and repeatability of the brazed joints
Increased productivity
Rings will need to be developed for specific joints to prevent the use of too much alloy
Precise control of the time and temperature

Photos: