Jurgis Rasmiras

Fusion metal welding

Welding – is a fabrication method to get indestructible join of separate materials. There are many and very different welding processes and methods. Fusion welding is widely applied in industry, agriculture, construction and other areas. In addition to arc welding, also apply to contact, gas, pressure, thermal, inductive, laser welding and other methods.

Welding – is a fabrication method to get indestructible join of separate materials. There are many and very different welding processes and methods. Fusion welding is widely applied in industry, agriculture, construction and other areas. In addition to arc welding, also apply to contact, gas, pressure, thermal, inductive, laser welding and other methods.
The greatest impact on welding has metal chemical composition. Carbon steel that contains up to 0.35% carbon is welded well by all means. If steel has up to 1.0-1.5% silicon or manganese, welding is not compromised, but the growing share of these impurities makes welding increasingly difficult.

Electric arc metal welding

When welding with electric arc, metal edges are melted by an electric arc. Aid seam forms a melted
metal. In order to create the arc, it is necessary to ionize the gas. To this purpose, the metal electrode is touched to metal. The short circuit starts when metal contact spot heats up, begins to emit electrons, which are ionizing close to the air, and away from the metal electrode arc occurs. Electric Arc - a long-lasting electric-discharge in gas environment. The arc voltage depends on the arc length and the spray density. Welding manually spray density is small, welding arc length is 2-6 mm and the required voltage is 10-20 volts. For fusion welding most commonly used fusible welding electrodes, consisting of metal bars, coating improve arc stability and metal to protect the environment, the atmosphere effect. Electrode in a molten metal entrained drops.

Arc melted electrode metal in the form of small droplets moving in the welding metal crater, the process continually repeats itself, the proposed results. Using the filament electrode the arc is burning between the metal edges of the electrode is fed with added wire, which melts at the temperature and shape seam.

Droplet size depends on the strength of the spray. At the same electrode diameters, growing current, a drop in its decline, and growing tension - increasing to it. Better proposed to come when a small drop. Therefore in order to obtain good welding seam must boil a short arc, low arc voltage and current selection of the
drops are small.

To produce welding electrodes witch are used to fill the welding grove, which produces in accordance with the relevant standards. Wire Mark - a metallic chemical composition, which is approximately equivalent to welded metal brand. Welding is used more refined metal from harmful impurities (sulfur, phosphorus), and has increased impurity content. Wire is produced 0,3-12 mm. Wire must be clean, it is considered dry, delivered in rolls (roll one piece). The most common fusible electrodes. Produced and unaccompanied electrodes from tungsten, graphite, carbon.

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