Induction Brazing thin walled tube
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Objective Braze a NI-SPAN-C alloy tube to a steel cap in a hydrogen atmosphere
Material NI-SPAN-C alloy tube (5mm) dia, steel cap (7mm) dia, (7mm) long, nickel braze, quartz tube and hydrogen
Temperature 1875 ºF (1024 ºC)
Frequency 313 kHz
Equipment • Power of 20kW 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.
Process 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.
Results/Benefits Induction heating provides:
• 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
brazing-thin-walled-tube
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