Category: Casting And Welding

Electroslag welding is used for welding of thick metal plates. Two plates are kept vertical at a distance of 2–3 cm. The filler wires and flux are kept in this gap. Here, the filler wires are used as the electrodes. The current supplied is AC. Initially an arc is created which melts the flux, and… Continue reading Electroslag Welding

This welding process is very similar to MIG welding except that a blanket of granular, fusible flux shields the metal arc during the welding operation instead of inert gas. A bare electrode is fed through the welding head into the flux as shown in Figure 20.38. The arc is started either by striking the electrode on… Continue reading Submerged Arc Welding (SAW)

In this welding process, a non-consumable electrode of tungsten is used as shown in Figure 20.37. Filler material is supplied externally if it is required. The tungsten electrode is connected at negative pole of power supply and work at positive pole of power supply. Inert gas like argon or helium is supplied through a gas nozzle… Continue reading Tungsten Inert Gas Arc Welding (TIG)/Gas Tungsten Arc Welding (GTAW)

In MIG welding, a high current density is supplied to the electrode and workpiece. Carbon dioxide gas or any inert gas like helium or argon is supplied to protect the weld pool. The electrode used is consumable and is in the form of wire. Automated feed of the wire is used as shown in Figure 20.36.… Continue reading Metal Inert Gas Arc Welding (MIG)/Gas Metal Arc Welding (GMAW)

In this welding process, a special electrode that consists of metal wire which has bonded coating containing flux of desired gradients is used. The heat required for welding is generated by an arc between the flux covered consumable electrode and the workpiece. The process is shown in Figure 20.35. As the coating on the electrode melts… Continue reading Shielded Metal Arc Welding (SMAW)

There is not a fixed rule of coding for bared electrodes. But there is a six digit code which is used for specification of the coated electrodes. The six digit code has a prefix and suffix letter. For example, E426413H

Selection of electrodes is based on the following factors: