||A.C Welding Machine
||D.C Welding Machine
||Cost: A.C welding machine is cheaper as compared to the D.c welding machine
||Cost: D.C welding machine is two to three times costlier as compared to the A.c welding machine
||Weight: They are lighter in weight.
||Weight: D.c welding machines are larger and thus have a high weight
||Ease of operation: A.C welding Machines are easier to operate.
||Ease of operation: D.c welding machine is complicated.
||Maintenance: Maintenance of A.C welding Machine is easier and more economical as it has moving parts in it.
||Maintenance: Maintenance cost is higher because it has many moving parts
||Heat Generation: Heat generated is equal at both the poles, so the change of polarity is not required in A.c Welding machine
||Heat Generation: Heat generated is different at the work and the electrode by changing the polarity
||Non Ferrous metals and alloys: A.c welding machine is not suitable for welding all metals particularly non-ferrous metals and alloys
||Non Ferrous metals and alloys: All types of metals can be welded with D.c Welding machine by the change of polarity.
||Bare Electrode: Bare electrode cannot be used. Only specially designed coated electrodes can be used.
||Bare Electrode: Bothe bare and coated electrode can be used in the D.C welding machine.
||Quality of Weld: The quality of weld produced is lower than the D.C welding.
||Quality of Weld: The quality of weld produced is Higher than the A.C welding.
||Sheet Metal Welding: It is not suitable for welding of sheet metals because of the difficulty in starting the arc.
||Sheet Metal Welding: It is suitable for all sorts of work as the starting of the arc is easier as compared to the D.C welding machine.
||VOLTAGE DROP: Voltage Drop is less, which makes it possible to be used at a larger distance from the power supply.
||VOLTAGE DROP: Voltage Drop is high, due to which it can be used at a shorter distance from the power supply.
||GENERATOR: A.C welding machine cannot be run by a generator. It can only be used when an A.C Power supply source is available.
||GENERATOR: D.C welding Machine can be used anywhere with engine generator D>C generator or by rectified A.C supply
||Arc blow: It is easy to control the problem of arc blow.
||Arc blow: Control of arc Blow is a difficult and a severe issue.
||Operational Cost:: Low Operational Cost.
||Operational Cost: : High operational Cost.
||ELECTRICITY CONSUMPTION: Less Electricity Consumption per kg. of metal deposited.
||ELECTRICITY CONSUMPTION: Higher Electricity Consumption per kg. of metal deposited.
||Efficiency: High Efficiency
||Efficiency: Low efficiency.