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Correct use of battery automatic spot welder

September 2, 2021

1、 The correct use method of battery automatic spot welder is as follows:

1. During welding, the position of the electrode rod of the battery automatic spot welding machine shall be adjusted first, so that when the electrode is just pressed to the weldment, the electrode arms remain parallel to each other.

2. The number of stages of current regulating switch can be selected according to the thickness and material of weldment. After power on, the power indicator light should be on, and the electrode pressure can be obtained by adjusting the spring pressure nut and changing its compression degree.

3. After completing the above adjustment, the battery automatic spot welder can first connect the cooling water and then connect the power supply for welding. Procedure of welding process: place the weldment between the two electrodes, step on the foot pedal, and make the upper electrode contact with the weldment and pressurize. When the foot pedal is continuously pressed, the power contact switch is connected, so the transformer starts to work, and the secondary circuit is energized to heat the weldment. When the pedal is released after welding for a certain time, the electrode rises, and the power supply is cut off first and then restored to the original state by the tension of the spring, and the single point welding process is over.

4. Preparation and assembly of weldments: all dirt, oil stain, oxide scale and rust must be removed before steel weldments are welded. For hot rolled steel, it is best to pickle, sand blast or remove oxide scale with grinding wheel. Although the unclean weldment can be spot welded, it seriously reduces the service life of the electrode and the production efficiency and quality of spot welding. Medium and low carbon steel with thin coating can be welded directly.

2、 Instructions for battery automatic spot welder

The spot welding machine adopts the principle of double-sided double-point over-current welding. During operation, two electrodes pressurize the workpiece to form a certain contact resistance under the pressure of two electrodes. When the welding current flows from one electrode to the other electrode, an instantaneous hot fusion is formed at the two contact resistance points, and the welding current flows from the other electrode along the two workpieces to this electrode to form a circuit, Do not damage the internal structure of the welded parts.

The process of spot welding is to turn on cooling water;

Clean the surface of the weldment. After accurate assembly, send it between the upper and lower electrodes and apply pressure to make it contact well;

The contact surfaces of the two workpieces are heated and partially melted by power on to form Nuggets;

Maintain the pressure after power failure to make the nugget cool and solidify under pressure to form solder joints;

Remove the pressure and take out the workpiece. Welding parameters such as welding current, electrode pressure, energizing time and electrode working surface size have a significant impact on welding quality.

The battery automatic spot welder uses the high-temperature arc generated by the instantaneous short circuit between the positive and negative poles to melt the solder and welded material on the electrode to achieve the purpose of combining them. The structure of the electric welding machine is very simple. To put it bluntly, it is a high-power transformer that changes 220V AC into a low-voltage, high current power supply, which can be DC or AC. Welding transformer has its own characteristics, that is, it has the characteristics of sharp voltage drop.

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