Brazing Carbide to Steel Part With Induction Heating

Brazing Carbide to Steel Part With Induction Heating

Objective
Brazing carbide to steel part

Equipment
DW-UHF-6kw Induction Heating Power Supply
ultra high frequency 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

Induction Brazing Process:

  1. 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.
  2. The custom made coil was then placed over the steel piece, where is was set for 14 seconds to heat the alloy.
  3. The alloy was heated at approximately 1500°F (815)°C
  4.  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