Question

In which of the following aspects is DC welding better than AC welding?
1. Efficiency
2. Power consumption
3. Cost
4. Arc stability

Answer 1

Correct Answer - Option 4 : Arc stability

DC welding	AC welding
Motor generator set or rectifier is required in case of the availability of AC supply	Only the transformer is required
The cost of equipment is high	The cost of equipment is cheap
Arc stability is more	Arc stability is less
The heat produced is uniform	The heat produced is not uniform
Both bare and coated electrodes can be used	Only coated electrodes should be used
The operating power factor is high	The power factor is low, So, the capacitors are necessary to improve the power factor
It is safer since the no-load voltage is low	It dangerous since the no-load voltage is high
The electric energy consumption is 5-10 kWh/kg of deposited metal	The electrical energy consumption is 3-4 kWh/kg of deposited metal
Arc blow occurs due to the presence of a non-uniform magnetic field	Arc blow will not occur due to the uniform magnetic field
The efficiency is low due to the rotating parts	The efficiency is high due to the absence of rotating parts