TYPES OF WELDING

TYPES OF WELDING

Non-consumable Electrode Arc welding

As a non-consumable electrodes  tungsten or carbon  electrodes can be used. In gas-tungsten arc welding  tungsten electrode is used in place of the metal electrode used in shielded metal-arc welding. A chemically inert gas, such as argon, helium [«hJlIqm], or carbon dioxide is used to shield the metal from oxidation. The heat from the arc formed between the electrode and the metal meits the edges of the metal. Metal for the weld may be added by placing a bare wire in the arc or the point of the weid This process can be used with nearly all metals and produces a high-quality weld. However, the rate of welding is considerably slower than in other process.

Shielded Metal Arc welding

In shielded metal-arc welding, a metallic electrode which conducts electricity, is coated with flux and connected to a source of electric current. The metal to welded is connected to the other end of the same source of current. An electric arc is formed by touching the tip of the electrode to the metal and then drawing it away. The intense heat of the arc melts both parts to be weided and the point of the metal electrode, which supplies fillermetal for the weld. This process is used mainly for welding steels.

Gas-Metal Arc welding

In gas-metal welding, a bare electrode is shielded from the air by surrounding it with argon or carbon dioxide gas and sometimes by coating the electrode with flux The electrode is fed into the electric arc, and melts off in  droplets that enter the liquid metal of the weld seam, Most metals can be joined by this process.

Submerget Are welding

Submerged Arc welding Submerged-arc welding is similar to gas-metal arc welding, but in this process no gas is used to shield the weld, Instead of that, the arc and tip of the wire are .submerged beneath a layer of granular, fusible material that covers the weld seam. This process is also called electro slag welding. It is very efficient but can be used only with steels.