Control Modes of Energy Storage Spot Welding Machines

When operating an energy storage spot welding machine, it is important to select the appropriate “control mode” based on different products and materials to achieve the best welding results. The feedback control modes of energy storage spot welding machines mainly include “constant current,” “constant voltage,” and “constant power.”

Constant Current Mode:

Constant current refers to the ability to change the voltage across the electronic circuit to maintain a constant current. The constant current mode can be used for 65% of all applications, including those with low contact resistance, small variability in contact resistance, and flat parts.

Features of Constant Current Mode:

Provides constant current when resistance changes.

Compensates for changes in workpiece thickness.

Ideal for flat parts assembled with stable electrodes.

Constant Voltage Mode:

Constant voltage refers to the ability to fluctuate output current to maintain a set voltage. Constant voltage can be used when the workpiece surface is not flat (e.g., cross circuits) and when there is significant resistance variation. It can also be used for extremely short seam welding (less than 1 millisecond).

Compensates for workpiece misalignment and inconsistent pressure.

Reduces splashing during welding.

Ideal for round (non-flat) parts.

Constant Power Mode:

“Constant power” operates by measuring the voltage across both ends and the current consumed by the load. Current control circuits are used to precisely control the output current of the power source. This mode is suitable for applications where the resistance between welding points significantly varies, including applications involving electroplating erosion and electrode surface buildup.

Features of Constant Power Mode:

Constant energy control achieved by adjusting current and voltage.

Breaks through oxide layers and coatings on the workpiece surface.

Highly suitable for automation and extends electrode life.

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This translation provides a detailed explanation of the control modes of energy storage spot welding machines. Let me know if you need further assistance or revisions: leo@agerawelder.com