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:
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Rapid localized heat to joint area only
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Minimized oxidation reduces cleaning time
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Improved part quality
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Hands-free heating that involves no operator skill for manufacturing

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