Note: Braze a thin walled tube to a steel cap

Objective:

Braze a NI-SPAN-C alloy tube to a steel cap in a hydrogen atmosphere 

End Product:

Tube assembly

Equipment:

Ambrell 10 kW induction heating system, equipped with a remote workhead containing two 1.5μF capacitors for a total of 0.75μF An induction heating coil designed and developed specifically for this application

Materials:

NI-SPAN-C alloy tube (5mm) dia, steel cap (7mm) dia, (7mm) long nickel braze quartz tube hydrogen 

Temperature:

1875 °F (1024 °C)

Frequency:

313 kHz

Testing:

A single turn helical coil is used to heat the tube assembly directly. The tube assembly is held in place inside the quartz tube by a copper fixture and hydrogen is fed into the quartz tube. Braze preforms are placed at the braze area and heat is applied for 60 seconds to flow the braze.

Benefits:

  • Rapid localized heat to joint area only

  • Minimized oxidation reduces cleaning time

  • Improved part quality

  • Hands-free heating that involves no operator skill for manufacturing 

Braze a thin walled tube to a steel cap

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