tagline
585.368.2120 | send email
heating

PROCESSES


Annealing

Bonding

Brazing

Forging

Fusing

Hardening

Heat Staking

Heat Setting

Pre-Tinning

Susceptor Heating

Pre-Heating for Welding


call us 585-368-2120

email send an email

Brazing Metering Plates to Turbine Blades With Nickel

location of metering plate on turbine blade

Research Objective

To heat a turbine blade in a vacuum to 2000°F and hold temperature for five minutes for a nickel brazing application.

Parts & Materials Description

Inconel turbine blades, nickel metering plates, nickel braze

Temperature Required

2050°F maximum

Induction Heating Equipment

ABS Mark 2 with high vacuum option and optical pyrometer for temperature measurement; 20kW power supply with a remote heat station containing three (3) 0.75 μfd capacitors (for a cumulative capacitance of 0.25 μfd) and a specially-designed inductor (coil).

Operating Frequency

280 kHz

Heating Procedure

The ABS Mark 2 with a vacuum level of <5x10(-4) torr was used for the testing. A specially-designed inductor was used to provide optimal heating (approximately 80% energy efficiency) to the braze joint area. The temperature of the joint area was measured with an optical pyrometer. RF power from the 20kW power supply was applied to the plate for two minutes. As the plate temperature reached 2000°F, the power was automatically reduced by the pyrometer to maintain the temperature for a five-minute period. A one-minute cool-down Argon quench was used for an overall cycle time of eight minutes.

Conclusion

The metering plates were successfully brazed to the turbine blades with nickel within five minutes at 2000°F. The nickel braze flowed well and the joints were clean. Since only the braze joint area was heated, an additional braze stop-off step was not necessary.