Welding machine Connection of power cord

2) The primary power supply should have good contact with the corresponding power supply terminal or socket to prevent oxidation.

3) Use a multimeter to measure whether the input voltage value is within the fluctuation range.

2-2. Connection of output lines

1) Each welding machine is equipped with two quick plugs. The quick socket on the front panel of the quick plug should be tightened with force to ensure good contact. Otherwise, if the working time is long and the working current is high, the plug and socket will be burned. This should be given sufficient attention.

2) Connect the welding wire to the negative pole of the front panel, connect the workpiece to the positive pole, and connect the other end of the ground wire clamp to the red quick plug. Pay attention to tightening the connection with an internal hexagonal wrench to ensure good contact between the secondary cable (handle wire and ground wire) and the quick plug, otherwise it will burn out the quick plug.

3) Attention should be paid to the polarity of the wiring. Generally, there are two types of wiring methods for DC welding machines: forward connection method and reverse connection method;

Positive connection method: Connect the welding handle to the negative electrode and the workpiece to the positive electrode; (Applicable to acidic welding rods)

Reverse connection method: Connect the workpiece to the negative electrode and the welding handle to the positive electrode. (Suitable for stainless steel, cellulose alkaline welding rods, etc.)

When welding, it is selected according to the process requirements of the workpiece. If not selected properly, unstable arcs, large splashes, and sticking strips may occur. In this case, the quick plug can be easily replaced to change polarity.

4) If the distance between the workpiece and the welding machine is too far (50-100 meters). The secondary wires used (connecting wires and ground wires) are relatively long, so when selecting the wire cross-sectional area, it should be appropriately larger to reduce cable voltage drop.

2-3. Inspection

1) Is the welding machine reliably grounded according to the standard.

2) Are all nodes in good contact (especially the ground wire clamp in contact with the workpiece).

3) Is the output wire short circuited to the ground wire.

4) Is the polarity of the output correct.

5) If a circuit protector is selected, the leakage current is less than 30mA.

6) Splashing during welding can cause a fire, so it is necessary to check for flammable materials nearby.