Induction Braze Carbide Cap to Steel Shaft

Objective of Application Test: Induction Braze Carbide Cap to Steel Shaft. Customer currently uses a torch process, but would like to change to induction to reduce scrap and rework and improve quality of 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