What is Electroslag Welding in Welding?

Electroslag welding is a welding process that produces the coalescence of metals with molten slag. This process melts the filler metal and the surfaces of the work to be welded. The molten weld pool is shielded by the slag, which moves along the full cross-section of the joint as welding progresses.

This type of welding is used for welding ferrous alloys, non-ferrous alloys, and dissimilar metals. It is also used for joining thick sections of metals, repairing castings, and fabricating heavy-duty structures.

Advantages and disadvantages of electroslag welding

The advantages of electroslag welding include:

Produces high-quality welds.
Can be used for welding thick sections of metals.
Can be used for repairing castings.
Can be used for fabricating heavy-duty structures.

The disadvantages of electroslag welding include:

Requires special equipment.
Requires highly skilled operators.
Is a slow process.
Is a costly process.

Who uses electroslag welding?

Electroslag welding is used by industries such as:

shipbuilding,
power generation,
and petrochemical.

It is also used in the construction of offshore oil platforms, bridges, and pressure vessels.

What is ESW and EGW welding?

ESW and EGW welding are two types of electroslag welding. ESW welding is used for welding ferrous alloys, while EGW welding is used for welding non-ferrous alloys.

Electroslag welding principle

The principle of electroslag welding is similar to that of submerged arc welding. However, in electroslag welding, the slag is melted by an electric current, while in submerged arc welding, the slag is melted by a gas flame.

Resistance welding

Resistance welding is a type of welding that produces coalescence of metals with heat generated by the resistance of the metals to an electric current.