Note: Preheating oil drilling shaft before welding
Objective:
To preheat a steel pipe to 500 °F (260 °C) before welding.
End Product:
Steel pipe
Equipment:
Ambrell 45 kW induction heating system, equipped with a remote workhead containing eight 1.0 μF capacitors for a total of 8 μF
An induction heating coil designed and developed specifically for this application
Materials:
Steel shaft assembly 5 - 8 in OD (127 - 203.2 mm) with a 2 in (50.8 mm) heat zone.
Temperature:
500 °F (260 °C), if higher temperatures are required, heat time can be increased.
Frequency:
83 kHz
Testing:
A multi-turn two position channel âÂÂC in coil, adjustable on a busbar is used to heat the desired heat zone. The coil is adjustable to fit various diameter pipes. The shaft is rotated in a fixture and heated for 3 minutes to achieve a temperature of 500 °F (260 °C).
Benefits:
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Preheating prevents shock to shaft which eliminates cracking in the welding phase
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Hands-free heating that involves no operator skill for manufacturing
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Even distribution of heating between the shank and the sleeve

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