Making a welding machine "Kid"

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Making a welding machine "Kid"


The welding machine operates from 220 V and has high electrical characteristics. Thanks 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 up 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 circuit are approximately 5 times higher than in the Sh-shaped, while the electric losses are minimal.
To get rid of the search for scarce transformer iron, you can buy a ready-made LATR at 9 A or use a tor-magnet from a burnt-down laboratory transformer. To do this, remove the fence, reinforcement and remove the burned winding. The freed magnetic circuit must be isolated from future layers of the winding by an electrocardboard or two layers of weave. The welding transformer has two independent windings. In the primary wire PEV-2 0, 1.2 mm, length 170 m is used. For convenience of operation it is possible to use a shuttle (a wooden rack 50 X 50 mm 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 glassy insulation - has 45 turns on top of 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 gently, without touching the adjacent turns, so as not to damage the insulation, stretches and stacks 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 bought a LATR for 9 A and when it turned out that his winding is safe, then the matter is much simpler. 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 remaining ends, securely insulated, temporarily press down to the magnetic circuit, 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, having pre-drilled the ventilation holes in it. The wires of the primary winding are connected to the 220 V network by the SHRPS or GRP cable; In the chain, it is necessary to provide a switching automaton AP-25. The leads 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 ballast electrode holder - a nichrome or constan wire of 3 mm and a length of 5 m, folded-tie-in ", which is attached to the asbestos-cement sheet, in series to the target. All connections of wires and ballast - using M10 bolts. Using the picking 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 device must be disconnected from the main for at least 5 minutes.