People involved in electric arc welding are familiar with the feeling of annoyance and annoyance that arises from an unexpected interruption of work due to the fact that the mass cable of the welding machine suddenly stops contacting the workpiece. Traditionally, spring "crocodiles" are used for its fastening, whose grip weakens with frequent use.
In addition, there are situations when it is simply impossible to attach such a clamp to the workpiece. An alternative to a crocodile clip is magnetic device for attaching the mass cable, which can be done from the old speaker from the radio.
A speaker is needed for a large diameter. It is not necessary to dismantle a working radio for its extraction, if you wish, you can find one at the nearest car dump.
How to make a magnetic mass for welding
It is not difficult to make a magnetic fastening of the mass wire of the welding machine from it. For this:
1. Unscrew the magnet mounting screw located on the back of the speaker.
2. Separate the magnet from the structure by simply picking it up with a screwdriver.
3. Grind the surface of the magnet to a smooth state using a grinder equipped with a flap disc.
4. Disassemble the standard spring clamp of the mass cable of the welding machine and release the end of the wire from it.
5. Select a bolt suitable for the diameter of the hole of the cable lemma.
6. Insert the bolt into the hole of the magnet.
7. Assemble the fixture completely.
The result is a convenient magnetic fastening of the mass cable, which has a large area and, therefore, provides sufficient force of its clamp to the surface of the workpiece.
When the welding machine is in operation, the magnet of such a device and the mass cable do not heat up, with moderate use, the magnetic mass can last quite a long time.
Full video version of making magnetic mass from an old speaker.