Electroslag Welding (ESW) the process of welding is to join two plates or metals by depositing the weld metal in the weld cavity. In order to prevent the running off of molten slag the space is covered with the help water cooled copper dams. Since the depositions rates are very high in Electroslag Welding it is considered most productive welding techniques for joining very thick metals. The process makes the use of direct current to weld the thicker metals and so the need of making an arc is extinguished.

Advantages of Electroslag Welding method include:

• Highly productive in welding techniques
• The cost of making a joint is very low
• The welding process can be carried on a single pass without taking into the consideration the thickness of metals
• During the butt joints there is no angular deformation
• The stress of transverse is very little
• The risk of hydrogen getting cracked is low
• Major repairs can be done in simple techniques by cutting out the weld totally and re – welding it
• The speed of welding joints is 1 hour/ meter of seam, where the thickness of material is not taken into consideration