The high-quality welds produced by medium frequency spot welding machines rely on electrode pressure. This pressure is the value presented by the pressure reducing valve when the upper and lower electrodes make contact. Both excessive and insufficient electrode pressure can decrease the load-bearing capacity of the welds and increase their dispersion.
Experiments have shown that insufficient electrode pressure has a greater impact on tensile loads. When the electrode pressure is too low, the insufficient plastic deformation range and degree of the metal in the welding area lead to excessive current density, resulting in spatter. This not only alters the shape and size of the fusion zone but also affects its strength.
Generally, increasing the electrode pressure while appropriately increasing the welding current or time helps maintain consistent heating in the welding area. Additionally, increased pressure can eliminate the adverse effects of pressure fluctuations caused by factors such as assembly clearances and uneven rigidity on the weld strength. This not only maintains the strength of the welds but also greatly improves their stability.
When welding thin plates, it is believed that less pressure is needed for thin plates and more pressure is needed for thick plates. In practice, the pressure on metal thin plates during welding should be slightly higher than usual. This allows the plates to overcome deformation during melting, resulting in better backside welding and spot welding.
When welding thick plates, excessive welding pressure is unnecessary. Adjusting the pressure slightly lower is preferable because the deformation of the plate’s backside is not dependent on pressure. Lower pressure results in less spatter and better fusion zone formation.
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Post time: Mar-06-2024