Make a welding machine. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Make a welding machine. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / welding equipment

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If you look at the installation of a modern radio or television, you will not find a single solder in it. All conductor connections are made by welding. Welding reduces the time of installation of the circuit, saves electricity, since current is consumed only when welding conductors.

We offer the design of one of the welding machines to radio amateurs. This device consists of a pencil that replaces the soldering iron, and a power transformer.

The pencil is made mainly from parts made on a lathe. Inside the pencil, with the help of a pen, one of the electrodes moves - a carbon rod (see Fig.).

(click to enlarge)

The second electrode is a red copper tip. The cleaned ends of the parts to be welded are brought slightly inside the tip and pressed against it. The carbon rod is moved by a handle. The power circuit of the pencil closes through the ends of the parts, and they are melted by the resulting arc. The welding mode depends on the diameter of the wires to be welded and is regulated by changing the supply voltage of the pencil (see table).

Table

Wire diameter, mm	Voltage, V
0,05-0,1	10
0,1-0,3	12
0,3-0,5	20
0,5-1,0	25
1,0-2,0	30

It is convenient to use an electrode from an old pocket flashlight battery as a carbon rod. The spent rod is replaced with the tip removed.

Scheme of the device for welding wires:

Make a welding machine

From the taps of the secondary winding of the transformer Tr1, the switch P1 supplies the required welding voltage (within 10-36 V). The transformer is turned on in a 127 V or 220 V network by moving the power plug to the appropriate sockets.

Author: G.Khovansky

See other articles Section welding equipment.

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