Objective
Brazing carbide tips to a steel impeller. Use induction heating to first debraze used carbide tips from the steel impeller, and then rebraze new replacement carbide tips. Customer is considering bringing the job in house in an effort to improve turn-around time and minimize downtime.
Equipment
5 kW Power supply
HS-4 Heat Station
Materials
• Steel impeller
• Carbide – 0.085” (2.159mm) thick x 0.877” (22.276mm) wide
• EZ Flo 3 braze paste
Test 1 (Used Carbide Tip Removal)
Key Parameters
Temperature: ~ 1450°F (788°C)
Power: 4 kW
Time: 8 seconds
Test 2 (Replace Braze Carbide Tip)
Key Parameters
Temperature: ~ 1450°F (788°C)
Power: 2.93 kW
Time: 14 seconds
Carbide Tipping is specific brazing process by which a hardened tip material is applied to a base material to produce an extremely hard cutting edge. When using induction heating, the tipping material is brazed to the base material with temperatures up to 1900 degrees F.
Process for Debrazing:
- White flux was added to the used carbide tips at the interface area prior to heating.
- The Parts were brought up to temperature, and the part was tapped lightly to help loosen and remove.
Process for Rebrazing:
- The surface area was cleaned and lightly ground to provide a flat smooth interface area for the replacement braze cycle
- Alloy was added and the carbide positioned on the impeller. The coil was positioned and angled around the part.
- The power was reduced to permit a soak time and ensure proper alloy wetting.
Results/Benefits:
- In-house operation of replacing carbide tips enables fast turnaround time, and minimizes downtime.
- Precise control of the time and temperature
- Power on demand with rapid heat cycles
- Repeatable process, not operator dependent
- Safe heating with no open flames
- Energy efficient heating
- Precise heating
Pictures
Video
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