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 “C 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:

  • Preheating prevents shock to shaft which eliminates cracking in the welding phase

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

  • Even distribution of heating between the shank and the sleeve

Preheating oil drilling shaft before welding

Visit our Applications Lab to learn more about free applications testing.
1655 Lyell Ave, Rochester, NY 14606 USA | Tel: +1 585 889 9000