MIG Welding Machine

1. No output

Fault cause: Mainly the primary coil or secondary coil has a circuit break.

Troubleshooting method: Use direct observation or multimeter measurement to detect the circuit break point. After finding the circuit break point, use welding method or screw to fix the connection, and add insulation pads.

2. The welding current is too small

Fault cause: The welding cable is too long; the welding cable is rolled into a disc shape, causing the inductance to be too large, and the welding cable has poor contact with the terminal.

Troubleshooting method: Reduce the cable length or increase the cross-sectional area of ​​the cable core, straighten the cable as much as possible so that it does not bend, and make the cable line have good contact with the terminal.

3. The welding machine casing is charged

Fault cause: The primary or secondary coil touches the shell, the power cord touches the shell, the welding cable touches the shell, and the shell is poorly grounded or not grounded.

Troubleshooting method: Eliminate the shell contact phenomenon, connect the ground wire, and ground the shell well.

4. During welding, the movable iron core has a strong vibration sound

Fault cause: The brake screw or spring of the movable iron core is loose, and the moving mechanism of the iron core is damaged.

Troubleshooting method: Tighten the brake screw or adjust the tension of the spring, and repair the moving mechanism of the iron core.

5. Overheating of the electric welder

Fault cause: The electric welder is overloaded, the transformer coil is short-circuited, and the insulation of the iron core screw is damaged.

Troubleshooting method: Reduce the current used; eliminate the short circuit, rewind the coil; restore insulation, etc.

6. The welding current fluctuates during use

Fault cause: ① The power supply voltage of the power grid fluctuates too much;

② The gap between the lead screw and the nut of the current fine adjustment mechanism is too large due to wear, which increases the vibration amplitude of the movable iron core, resulting in frequent changes in the relative position of the movable and static iron cores;

③ The gaps on both sides of the movable iron core and the static iron core are not equal, so that the electromagnetic force on the movable iron core during welding is unequal, resulting in excessive vibration, which also causes the relative position of the movable and static iron cores to change frequently.

Troubleshooting methods: ① Whether the grid voltage fluctuates can be measured with a voltmeter. If it is indeed caused by grid voltage fluctuations, avoid using the welding machine during peak hours;

② If the bolts at the circuit connection are loose, you can find out by opening the welding machine casing and tighten the bolts;

③ To adjust the gap between the lead screw and the nut, you can check it by shaking the adjustment handle forward and backward. Because there is a gap, you can feel the size of the gap with your hand. If the gap is indeed too large to be used, it should be replaced with a new part.