The National Science Fair

Welding

Welding now – it's the technological process of melting metal for connecting metal structures using welding equipment. During the welding process metal welded elements mixed in the weld due to high temperature. Let's take a closer look at features of TIG welding. For the first time this welding technique has been used in the late nineteenth century in our country, and then was modified by foreigners. The melting point in the process of arc welding is produced by combustion of the electrode in the form of an electric arc discharge.

For the welding electrode or SSSI steel rod is current. In some cases, instead of hot-metal electrode used for welding wire, which has melted during welding. In the industry generally in demand for welding of aluminum alloys and other metals is the second method. How does the process of electric welding? With the help of cable equipment for electric welding with direct or alternating current is connected to the connected elements, and with a hot cable – to the holder of the electrode. Column arc is formed in the time interval between repeated contact of the welding electrode and the outlet from the site welding. At the end of the welding electrode, thus, higher temperatures up to 6500 F, the metal edges joined parts and steel core electrode are melted to form a 'shell' of liquid metal (crater). During the distribution of craters in the area of the junction it cools and forms a reliable seal. Shielding arc Usually at this level arc welding does not end.

Under the influence of high temperature metal alloy has the ability to react with atmospheric oxygen. The weld is oxidized as a result of joint becomes brittle. Exactly therefore in the process of electric arc discharge and provided with a protective shell seam of a gas – usually argon. This protection is shielded arc discharge and a method of welding – welding in an argon atmosphere. In addition to protecting from the influence of air escaping also significantly improves the quality of the welded joint. Additional equipment for welding to improve the quality of electric also need to use different extra ordinary welding equipment. Welding rectifier: an apparatus which is used for arc welding, automatic welding and argon in steel elements under constant and alternating current. Welding Transformer: welding equipment necessary for manual arc welding with covered electrodes with alternating current components of low-carbon steels and alloys. This device regulates the current. The transformer is also equipped with a mechanical movement of the winding. Therefore, the welding transformer has the advantage of manual arc welding in the more remote areas of welding, where all the time required to move from one area to another. Welding inverter: additional welding equipment required to operate at a constant surge in the use of electricity generators and industrial Welding cable length. Due to the exceptional stability of the welding current is generated, welding inverters are very easy to work and significantly improve the quality of the weld. In addition, the welding inverters can operate in a wide range of currents under high load. This equipment is equipped with a fuse of the current fluctuations, spikes to the welding electrode, and also – when starting overheating.