Note: Brazing Hydraulic Hose Assemblies

Objective:

To heat a steel hydraulic hose fitting in an inert atmosphere to 2200 °F within 7 seconds for brazing without any carbon buildup.

End Product:

Hose fitting

Equipment:

Ambrell 3.5 kW heating susyem
remote heat station containing one 1.0 μF capacitor and a specially designed induction coil. 

Materials:

Three-opening steel hydraulic fitting
pure copper braze paste 

Temperature:

2200 °F

Frequency:

283 kHz

Testing:

A specially-designed, four-turn split helical coil was used to provide optimal heating to the joint area of the hydraulic fitting. The testing was done in the ABS Mark 2 containing a mixture of 95% Argon and 5% Hydrogen gas. RF power from the Ambrell 2kW heated the steel assemblies to 2200 °F within 7 seconds. An infrared pyrometer was used to measure the temperature of the part. After the copper braze flowed, the parts were allowed to cool and were removed from the bell jar

Benefits:

Successful results were achieved at 2200Ă °F within 7 seconds. The copper braze material flowed well and the joints were clean. For this type of brazing, the size of the power supply is dependent on the desired time-to-temperature.
Brazing Hydraulic Hose Assemblies

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