Note: Annealing a Weld Seam (Steel Assembly)

Objective:

To heat the weld seam of the steel part assembly

End Product:

steel part

Equipment:

Ambrell EKOHEAT 15 kW, 50-150 kHz induction heating power supply with a workhead and coil specifically designed for this application.

Materials:

Steel part assembly

Temperature:

700 °F (371 °C)

Frequency:

103 kHz

Testing:

A custom-designed single position multiple-turn helical coil was built to generate the required heating for the annealing application. Initial tests were conducted to optimize the power delivered to the part and to understand the heating patterns achieved. Induction was applied only to the top portion of the weld bead. Temperature indicating paint was applied to evaluate the heating performance. This allowed THE LAB to design the optimal coil for this process, and they were able to confirm feasibility and heat the part to temperature in seven seconds.

Benefits:

  • Speed: The heating process took seven seconds, which met the client’s requirement.

  • Repeatability: Induction delivers the same result every single time, making it a great heating process for repeatability/quality.

  • Safety: With induction, there is no open flame, resulting in a safer, cooler work environment.

  • Efficiency: Induction is highly efficient only heating where required and it is instant on/off, making it a green choice.

  • Size of System/Workhead: Induction will easily fit into their process thanks to its modest size/required footprint. 

Annealing a Weld Seam (Steel Assembly)

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