We have seen the overview of a welding process, Arc welding process, Gas welding process, types of flames in Gas welding and Difference between Arc welding and Gas welding with the help of our previous posts.
Let us get more in depth and understand now the difference between DC welding and AC welding with the help of this post.
AC welding and DC welding are basically two different types of arc welding that use different currents in order to develop an electric arc. Such types of welding involve the production of an electric arc between an electrode and the metal being welded.
The electric arc will provide the heat in order to fuse the metals together. A power supply will be used to create the arc, which can either use direct current (DC) or an alternating current (AC).
The selection of power source i.e. Direct current or Alternating current will decide the polarity of the electrical current that runs through the electrode. The source of power which is used will also impact the weld developed.
Salient Features of AC Welding
It is not suitable for welding non-ferrous metals
Maintenance cost is less
It is cheaper and simple welding
It is not suitable for welding sheet metals, since starting the arc is difficult
It consumes less power and also produces less noise
Bare electrodes cannot be used
AC is more dangerous
Arc is never stable
It can be used at a large distance from the power supply due to less voltage drop
Salient Features of DC welding
It is suitable for welding both ferrous and nonferrous metals
Maintenance cost is high
It is costlier and complicated
It is suitable for all types of weld as starting the arc is easy
It consumes more power and also produces
more noise
Both coated and bare electrodes can be used
DC is comparatively less dangerous
Arc is stable
It can be used only at a short distance from the power supply since the voltage drop is higher
We will see the soldering and brazing process in our next post.
Reference
Engineering Practices by Mr. S. SUYAMBAZHAHAN
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