Welding

By | November 10, 2011

Electrodes – elements of the welding circuit for supplying current to the work piece. The electrodes are divided into metallic and nonmetallic. Metal electrodes – melting involved directly in the formation of weld, and non-consumable, for supplying current to the product, filler metal is introduced from the outside. Wire In today's market is represented by wire in a wide range. Welding (copper-plated, powder), zinc and coated general purpose. Welding wire is used directly for welding, and for the manufacture of electrodes. 1. Manual electric welding.

Electric arc welding based on the phenomenon of electric arc between the electrode and steel welded steel parts, which melts the base metal and the metal electrode, forming a weld that connects the separate parts into one whole. Welding open electrode or wire, exposed arch gives substandard welds, since the molten weld metal oxygen fall, forming oxides of nitrogen, forming a nitride, so that the seam becomes brittle. For formation of a protective gas environment and better for the ionization of air space to the electrodes applied plaster. However, the quality of the weld is still low. Therefore, for this type of welding electrode used wire with a coating. These include alloying coating substances that improve, mechanical properties of sutures. 2. Automatic and semiautomatic welding.

The principle of automatic submerged arc welding is that the electrode fed to the welding point automatically for continuous unwinding of the bay of the electrode wire. The electrode is fed automatically head, which acts as a welder at the hands of manual welding. Instead of dressing apply a certain bulk chemical composition (flux), which is filled electrode tip. Flux completely isolates the weld point of the air, as arcing occurs under a layer of flux. As a result, obtained a uniform, tight seal with deep penetration, which has high mechanical properties. For suturing, which is inconvenient to carry out automatic welding, can be used semi-automatic welding hose submerged. The idea of this type of welding is that the thin electrode wire diameter of 2 mm is fed to the welding point on the flexible hose in a mechanized way, and the movement along the seam by hand. Flux is fed directly from the holder, which are also buttons. In this case, the wire is irreplaceable and will be better than using the electrode. 3. Arcogen welding in carbon dioxide used for low-carbon steels. Gas is fed to a special burner, flowing consumable wire electrode, which can be fed automatically. Argon welding is used primarily for welding metal, as well as thin sheets of high-alloy stainless steels and superalloys. Performing welding, torch, inside of which is non-consumable tungsten electrode, exciting and supporting the electric arc, and it wraps around the outside of the protective gas – argon. In the weld pool is administered in the form of filler wire. 4. Electric welding fusion. When an electric fusion welding is used The following welding products: welding wire, and non-consumable electrode melting rods, coated welding electrodes. Semi-automatic welding equipment is most often used with steel copperplated wire as electrode. But semi-automatic, you can cook stainless steel and aluminum. In this case, welding is conducted using the appropriate wire and gas. From all we can conclude that it is better to use the wire in electric welding, semi-automatic and in some cases, manual welding. And the electrodes should be used in manual, automatic, and gazoelektricheskoy types of welding.


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