Electric welding uses the properties of the arc formed between two conductors (electrode wrapped and welded material). The condition necessary to obtain the arc is a space between the aforementioned ionization. guides during which the gas becomes a conductor of electricity and allows arc starting and maintaining it. Arising from these gases from the atmosphere, protect the liquid weld pool. The melting creates a buffer zone on the surface of the weld slag that protects the solidifying weld metal from the atmosphere and too rapid cooling.
Advantages of electric welding:
- The possibility of welding different types and species of metals and alloys
- The possibility of welding in any position in field conditions, altitude and even under water,
- The possibility of welding of thin and thick parts,
- The use of easy-to-use, easy portable MMA,
- High quality welds, good mechanical properties.
Disadvantages of electric welding:
- Low productivity of work (for heavy elements)
- Low speed welding
- The need to slag removal and replacement of electrodes, which further reduces the efficiency of the process,
- Weld quality depends heavily on the skill of the welder,
- High sensitivity to moisture – especially basic electrodes,
- A large amount of the gases and welding fumes.
With a large selection of coated electrodes with better and better electrode welding properties were applied to welding low carbon steel (alloy), low-alloy and high-strength, high-alloyed special steels, cast steel, cast iron and ductile iron, copper and its alloys, nickel and nickel alloys, aluminum and some of its alloys.
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welding
