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Making a welding machine "Kid"

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Making a welding machine "Kid"

The welding machine operates from the 220 V network and has high electrical characteristics. Due to the use of a new form of magnetic core, the weight of the device is only 9 kg with overall dimensions of 125 X 150 mm. This is achieved using a striped transformer iron, rolled into a roll in the form of a torus, instead of a traditional pack of W-shaped plates. The electrical characteristics of the transformer on the core of the magnetic core are approximately 5 times higher than those of the Sh-shaped, while the electric losses are minimal.
To get rid of the search for scarce transformer iron, you can purchase a ready-made LATR at 9 A or use a torch magnet from a burnt-out laboratory transformer. To do this, remove the fence, reinforcement and remove the burned winding. The freed magnetic circuit must be isolated from the future layers of the winding by an electrocardboard or two layers of lacquer. The welding transformer has two independent windings. In the primary wire PEV-2 0, 1.2 mm, 170 m long is used. For convenience, a shuttle can be used (a 50 x 50 mm wooden strip with slots at the ends), on which the entire wire is prewound. Between the windings an insulation layer is placed.
Secondary winding - copper wire in cotton or glass insulation - has 45 turns over the primary. Inside the wire, the turn is placed to the turn, and on the outside with a small gap - for even positioning and better cooling. It is more convenient to carry out the work together: one carefully, without touching the adjacent turns, so as not to damage the insulation, stretch and lay the wire, and the assistant holds the free end, preventing it from twisting. A welding transformer manufactured in this way will produce a current of 80-185 A.

If you purchased a LATR for 9 A and when it turned out that his winding is safe, then the matter is greatly simplified. Using the finished winding as the primary one, it is possible to assemble a welding transformer for 1 hour, giving a current of 70-150 A. For this, it is necessary to remove the fence, the current slider and the fixing armature. Then determine and label the leads at 220 V, and the other ends, securely insulated, temporarily press down to the magnetic core, so as not to damage them when working with the secondary winding. The latter is installed in the same way as in the previous version, using a copper wire of the same cross section and length.
The assembled transformer is placed on an isolated platform in the previous casing, pre-drilled in it for ventilation holes. The wires of the primary winding are connected to the 220 V network by the SHRPS or GRP cable; in the circuit, it is necessary to provide a switching automaton AP-25. The terminals of the secondary winding are connected with flexible insulated wires of the PRG, one of them is attached to the electrode holder, and to the other - the workpiece to be welded. The same wire for the safety of the welder is grounded.
Current regulation is provided by switching the wire of the holder of the ballast electrode - a nichrome or constan wire of 3 mm and a length of 5 m, folded-tamecke, which is attached to the asbestos-cement sheet in succession to the target. All connections of wires and ballast - using M10 bolts. Using the pick-up method, moving the connecting point of the wire, set the required current. It is possible to adjust the current using electrodes of different diameters. Electrodes of the type E-5RA UONI-13/55 - 2,0-UD1 1-3 mm are used for welding.

All the necessary materials for the welding transformer can be purchased in the sales network. A person familiar with electrical engineering, to make such a device does not present difficulties. When working in order to avoid burns, it is necessary to use a fiber protective shield equipped with E-1, E-2 light filter. Headwear, overalls and mittens are also required.
Welding apparatus should be protected from dampness and prevent its overheating.

Approximate mode of operation with an electrode of 3 mm: for a transformer with a current of 80-185 A - 10 electrodes, and with a current of 70-150 A - 3 electrodes; after which the unit must be disconnected from the mains for at least 5 minutes.