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SELF-PORTABLE ARC WELDING MACHINE
The basis of the welding machine - laboratory transformer LATR 9 A. The whole piece of iron is also removed from the casing, only the winding remains on the core. In the transformer of the welding apparatus, it will become primary ( mains ). This winding is insulated with a pair of layers of electrical tape or varnished cloth. A secondary winding is wound over the insulation - 65 turns of a wire or a set of wires with a total cross section of 12 - 13 mm 2 . Winding strengthen tape. The transformer is installed on an insulating base made of a PCB or getinax inside a casing of sheet steel or duralumin with a thickness of no more than 3 mm . In the cover of the casing, on the back and side walls there are holes with a diameter of 8 - 10 mm for ventilation. From above strengthen the handle from a steel bar.
An indicator lamp is output to the front panel, a switch for 220 V, 9 And the secondary winding terminals - they connect the cable with the electrode holder to one of them, the cable to the other, the other end of which is pressed to the workpiece during welding. In addition, this last terminal when labor must be grounded. The indicator light of the alternating current type SN-1, SN-2, MN-5 signals the device is turned on.
Electrodes for this device must have a diameter of no more than 1.5 mm .
Electrodes are made as follows. Steel wire of the appropriate diameter is cut into pieces, sandpaper also covered with a coating consisting of crushed chalk and liquid glass (silicate glue). to ensure that the coating is even, the wire is vertically immersed in the coating, leaving the neat end on top of a suitable length, and is also slowly removed; at the same time, each electrode is suspended on a rope with a clothespin.
After drying, the electrodes are ready for use.