The contact resistance of medium frequency spot welding machines is influenced by several factors. These include the presence of high-resistance oxides or dirt on the surfaces of the workpiece and electrodes, which hinder the flow of current. Thick layers of oxides or dirt can completely block the flow of current. The size of contact resistance is related to electrode pressure, material properties, surface condition, and temperature.
Increasing electrode pressure leads to the compression of protrusions on the surface of the workpiece, breaking the oxide film and reducing contact resistance accordingly. Softer materials have lower compression strength, which increases the contact area and reduces contact resistance.
Surface condition also affects contact resistance. Rough surfaces have fewer protrusions, resulting in a smaller contact area and higher contact resistance. Unstable surface quality affects the stability of contact resistance.
During welding, as the temperature rises, the compression strength of the metal decreases, leading to a rapid increase in contact area and a decrease in resistance. Contact resistance accounts for a significant portion of the heat required for fusion during welding.
Contact resistance plays a decisive role in the heat required to form a fusion core. Additionally, the contact status, welding temperature, and resistance between the workpiece and electrode continuously change during the welding process.
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Post time: Feb-23-2024