What is Electrical Welding? | Different Types of Welding
Electrical welding :
Electrical welding is basic general theory for all electrical engineer, so practical knowledge of electrical welding is also necessary. This theory is also important in all examination.
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Electrical Welding
Definition
Welding is the method of joining metals by the application of heat, without the use of solder or any other metal or alloy having a lower melting point than the metals being joined
Welding Processes
These may be divided into two main groups:
1.Pressure welding
2.Fusion welding.
Electrical Welding Methods
The electrical welding methods which are used in the industry are as follows:
1.Resistance welding
(i)Butt welding
(ii)Spot welding
(iii)Seam welding
(iv)Flash welding
(v)Projection welding
2.Arc welding
(i)Metal arc
(ii)Carbon arc
(iii)Helium or argon arc
(iv)Atomic hydrogen.
Resistance welding
In resistance welding current is passed through the joint which is to be welded.
The heat is developed by the resistance of the joint and that is enough for causing fusion
of the metals for joining.
Arc welding
In arc welding heat is developed from an arc which is struck between the electrode and metal to be welded.
In case of D.C. for producing arc 30 to 50 volts are needed whereas in case of A.C.60 to 90 volts are necessary for striking the arc.
Following equipment is used:
✓DC equipment : Motor - Generator Set - Rectifier supply
✓AC equipment : Single operator type - Multiple Type
✓Engine driven equipment : When main supply is not available, DC Generators are used which are driven by internal combustion engine.
