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Difference between A.C vs D.C Welding Machines( With Pdf)

SR.NO A.C Welding Machine D.C Welding Machine
1 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
2 Weight: They are lighter in weight. Weight: D.c welding machines are larger and thus have a high weight
3 Ease of operation: A.C welding Machines are easier to operate. Ease of operation: D.c welding machine is complicated.
4 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
5 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
6 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.
7 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.
8 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.
9 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.
10 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.
11 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
12 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.
13 Operational Cost:: Low Operational Cost. Operational Cost: : High operational Cost.
14 ELECTRICITY CONSUMPTIONLess Electricity Consumption per kg. of metal deposited. ELECTRICITY CONSUMPTIONHigher Electricity Consumption per kg. of metal deposited.
15 Efficiency: High Efficiency Efficiency: Low efficiency.
A.C Welding Machine Vs D.C Welding Machine

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