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” (12.7 mm)
• Test 2: Shaft Diameter: 0.375” (9.525mm)
• Test 3: Shaft Diameter: 0.312” (7.925mm)
Key Parameters
Test 1: Shaft Diameter: 0.5” (12.7mm)
Temperature: Approximately 1450°F (788°C)
Power: Pre-curie – 3.3 kW
Time: 11 seconds
Key Parameters
Test 2: Shaft Diameter: 0.375” (9.525mm)
Temperature: Approximately 1450°F (788°C)
Power: Pre-curie – 1.8 kW
Time: 8 seconds
Key Parameters
Test 3: Shaft Diameter: 0.312” (7.925mm)
Temperature: Approximately 1450°F (788°C)
Power: Pre-curie – 1.7 kW
Time: 7.5 seconds
Process:
- Paste alloy was applied to the cone shape top of each steel shaft.
- The cap was set on top and rotated to distribute the paste alloy.
- Each assembly was positioned in the coil and heated.
- 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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