的接触电阻大小与电极压力有关，与材料性质和零件表面状况有关。 The contact resistance of the energy storage spot welding machine is related to the electrode pressure and the material properties and the surface condition of the part. As the electrode pressure increases, the bumps on the surface of the welding workpiece are crushed, so that the number and area of the contact points increase, so the contact resistance decreases.
In the process of spot welding, when the welding machine has a small capacity, sometimes the contact resistance is adjusted by adjusting the electrode pressure to adjust the heat during spot welding to improve the welding quality.
Similarly, the softer the material, the lower the crushing strength, the contact surface will increase under the same pressure, and the contact resistance will decrease. When there are oxides and dirt on the welding surface, especially oxides with very low conductivity, it will seriously hinder the current flow and significantly increase the contact resistance.
Contact resistance is also temperature dependent. During the welding heating process, as the temperature of the weldment gradually increases, the crushing strength of the contact point decreases, which causes the contact surface to increase sharply and the contact resistance to decrease rapidly. When the temperature of the steel is close to 6000C, its contact resistance disappears almost completely.
电容储能焊机厂家 ） Reprinted please indicate the source: Anjia spot welding machine 92shizhi.com ( capacitor energy storage welding machine manufacturer )