In electric arc welding is only a electrical spark, otherwise it is nothing. It is fusion welding process. It is work in a closed electrical circuit in which current flows. If a small gap formed in the circuit then there an electrical spark is occurred, which is called electrical arc. In this spark or arc are contain a huge amount of temperature like 34000C-40000C. Due to this huge temperature, the weld metal can be fuse in arc welding process.

Principle of Arc welding

Arc welding diagram image

In the arc welding the heat is produced through an electrode or arc welding rods. The electric arc is produced between consumable electrode and the work piece. The current is continuously supplied through the consumable electrode and fillet deposited on work piece. Thus the electric arc welding process is carried out. The electrode which is passing the current is made with flux coated, these types of electrode is called bar electrode. The coating flux are melt at the time of welding and deposited upper level of filler metal as a slag, which is removed by chipping or grinding process after normal cooling. The filler metal is called electrode in arc welding practice.

The carbon-arc welding is the another type of arc welding. Where carbon or graphite are used as a electrode. There are two methods used for produced an arcs, the single-carbon process and another is the twin-carbon process. The main difference is, the twin-carbon arc welding carried electrically independent torch. The carbon-arc welding is invariably carried out with direct current. The heat is produced between carbon electrode and work piece, base metal melts with this heat and additional filler metal can be added where extra metal needed. The essential point of this carbon-arc welding is that the filler rod quite difference from the ordinary filler rod. Because it can not be connected with current source.

Arc Welding Principle

Fusion Welding