Systems, methods, and apparatus to preheat welding wire

A consumable electrode-fed welding-type system, comprising:

• a welding-type power source configured to provide welding-type power to a welding-type circuit, the welding-type circuit comprising a welding-type electrode and a first contact tip of a welding torch;
• an electrode preheating circuit configured to provide preheating power through a first portion of the welding-type electrode via a second contact tip of the welding torch;
• and
• an electrode preheating control circuit configured to control the preheating power based on a user input specifying the preheating power, wherein the user input specifies the preheating power as a ratio based on 1) at least one of preheating wattage, a voltage of the preheating power, a current of the preheating power, or an impedance of the first portion of the welding-type electrode, and 2) at least one of welding-type wattage, a voltage of the welding-type power, a current of the welding-type power, or an arc impedance.