is the opposition that a substance offers to the flow of electric current.
The less resistance a metal has, the less heat is generated when current
passes through it. Conversely, the higher the resistance of a metal,
the more heat is generated when that same current passes through it.
This behavior can be paraphrased as follows: the heat is where the resistance
is, and the resistance is where the heat will be.
the best results in resistance welding requires a thorough understanding
of the materials being welded, careful control of the heat and pressure
at the weld point, and consideration of numerous other factors. This
chapter will deal with the basics of resistance welding, the variables
involved, and why they're so important to the welding process.
click here to download a PDF of "Overview of Resistance Welding."