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Induction Annealing Copper Tube
Induction Annealing Copper Tube With High Frequency Induction Heating System
Objective To heat both ends of a copper tube to anneal as soft asย possible 1.5โ (38.1mm) from end and retain full hardness nextย to anneal
Material 1.625โ (41.275mm) dia x 24โ (609.6mm) long copper tube
Temperature 1500 ยบF (815.5 ยบC)
Frequency 60 kHz
Equipment โข DW-HF-45kW induction heating system, equipped with aย remote workhead containing eight 1.0ฮผF capacitors for aย total of 8.0 ฮผF
โข An induction heating coil designed and developedย specifically for this application.
Process A four turn helical coil is used for this annealing process. Theย copper tube is placed in the coil and power is applied for a totalย of 7.5 seconds. At 3.75 seconds the copper tube is rotated halfย a turn to insure uniform annealing. The copper is tubeย immediately quenched to guarantee the annealed area is only
1.5โ (38.1mm) from end of tube. The tube is then flipped toย anneal the other end.
Results/Benefits Induction heating provides:
โข Controlled application of heat to very specific area
โข Faster process time, increased production
โข High efficiency, low energy cost
โข Hands-free heating that involves no operator skill forย manufacturing