By | April 11, 2015

Specification of  Electrodes

Generally, the size of the electrodes is specified by the length and its diameter. They are available to a maximum of 12 mm diameter and 450 mm length. The size of the electrode increases with the current used. In manual welding, the size of the electrode changes according to the thickness of the metal parts. Spring like electrodes are used in automatic welding.

Types of  Electrodes

The electrodes used in arc welding are of two types

  1. Consumable electrode
  2. Non-consumable electrode

There are three types of consumable electrodes. They are

  1. Bare electrodes
  2. Lightly coated electrodes
  3. Heavily coated electrodes

Non-consumable electrodes are used in the processes of atomic hydrogen welding and TIG welding.

Selection of  Electrodes

The material used for manufacturing electrodes depends upon the material to be welded. Given is the list indicating suitable materials for manufacturing electrodes for welding different metals.

Sl. No. Material to be welded Electrode material
1. Wrought iron Low carbon steel
2. Mild steel Mild steel with copper coating
3. Alloy steel Nickel steel
4. Cast iron Cast iron
5. Aluminium Cast aluminium alloy
6. Carbon steel Steel wire(0.15% carbon & 0.025% Phosperous
7. Copper Copper
8. Brass Brass
Soldering defects and safety precautions

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