| Plain 
        rod | Soft Ferrite | High frequency induction welding | 
     
      | Flat sided rod | Soft Ferrite | High frequency induction welding | 
     
      | Fluted rod | Soft Ferrite | High frequency induction welding | 
     
      | Plain tube | Soft Ferrite | High frequency induction welding | 
     
      | Fluted tube | Soft Ferrite | High frequency induction welding | 
     
      | Return flow impeder | Impeder Assembly | High frequency induction welding | 
     
      | Flow through impeder | Impeder Assembly | High frequency induction welding | 
     
      | Integral impeder | Impeder Assembly | High frequency induction welding | 
     
      | Flow through scarfing impeder | Impeder Assembly | High frequency induction welding | 
     
      | Return flow scarfing impeder | Impeder Assembly | High frequency induction welding |