Historical Background
Variables in the Welding Process
Critical Factors in Welding
Electrodes, Surface Contact and Current Density
Ohm's and Joule's Laws

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Resistance 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.

Obtaining 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.

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