Objective of Application Test: Induction Braze a Carbide Cap to a Steel Shaft - including several shaft and cap sizes. The customer currently uses a torch process, but would like to change to induction to reduce scrap and rework and improve quality of braze.
Brazing the carbide cap to the steel shaft |
Equipment
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”
• 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”)
Test 1 (Shaft Diameter: 0.5”)
Temperature: approximately 1450F
Power: Pre-curie – 3.3 kW
Time: 11 seconds
Frequency: 77 kHz
Power: Pre-curie – 3.3 kW
Time: 11 seconds
Frequency: 77 kHz
Key Parameters
Test 2 (Shaft Diameter: 0.375”)
Test 2 (Shaft Diameter: 0.375”)
Temperature: approximately 1450F
Power: Pre-curie – 1.8 kW
Time: 8 seconds
Power: Pre-curie – 1.8 kW
Time: 8 seconds
Frequency: 76 kHzKey Parameters
Test 3 (Shaft Diameter: 0.312”)
Test 3 (Shaft Diameter: 0.312”)
Temperature: approximately 1450F
Power: Pre-curie – 1.7 kW
Time: 7.5 seconds
Frequency: 76 kHz
Power: Pre-curie – 1.7 kW
Time: 7.5 seconds
Frequency: 76 kHz
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
Ultraflex Power Technologies provides Induction Heating Solutions for your heating challenges. Contact us today about your heating application.
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