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Braze Carbide Cap to Steel Shaft

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Braze Carbide Cap to Steel Shaft 2017-04-03T14:28:07+00:00

Carbide Tipping - induction Braze Carbide Cap to Steel Shaft

Objective
Induction braze a carbide cap to a steel shaft. Customer currently uses a torch process, but would like to change to induction in order to reduce scrap and rework and improve the quality of the braze.

Equipment
UltraHeat UPT-S5 Power Supply
HS-4 Heat Station

Materials
• Carbon steel
• magnetic carbide caps
• Alloy – EZ Flo 3 paste
• Test 1: Shaft Diameter: 0.5”
• Test 2: Shaft Diameter: 0.375”
• Test 3: Shaft Diameter: 0.312”

Key Parameters
Test 1 (Shaft Diameter: 0.5”)
Temperature: approximately 1450F
Power: Pre-curie – 3.3 kW
Time: 11 seconds
Frequency: 77 kHz

Key Parameters
Test 2 (Shaft Diameter: 0.375”)
Temperature: approximately 1450F
Power: Pre-curie – 1.8 kW
Time: 8 seconds
Frequency: 76 kHz

Key Parameters
Test 3 (Shaft Diameter: 0.312”)
Temperature: approximately 1450F
Power: Pre-curie – 1.7 kW
Time: 7.5 seconds
Frequency: 76 kHz

Process:

  1. Paste alloy was applied to the cone shape top of each steel shaft.
  2. The cap was set on top and rotated to distribute the paste alloy.
  3. Each assembly was positioned in the coil and heated.
  4. Preliminary heat tests were conducted using tempilaq paint to estimate the heat cycle to 1450 degrees F.

Results/Benefits:

  • Precise control of the time and temperature resulting in improved quality and consistent result
  • Power on demand with rapid heat cycles
  • Repeatable process, not operator dependent
  • Safe heating with no open flames
  • Energy efficient heating

Pictures

Video

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