DC welding machine
What is DC welding machine?
What is DC Welding? Direct current is an electric current that has a constant polarity flow in a single direction. This current can be positive or negative. With DC welding, since the magnetic field and current of the arc are constant, stable arcs are produced.
What is DC Welding?
Direct current is an electric current that has a constant polarity flow in a single direction. This current can be positive or negative. With DC welding, since the magnetic field and current of the arc are constant, stable arcs are produced.
Advantages
The advantages of DC welding are:
A smoother welding output than with AC
A more stable arc
Less spatter
DC negative offers faster deposition rates when welding thin sheet metals
DC positive provides greater penetration into the weld metal
Disadvantages
The disadvantages of DC welding are:
DC welding is unable to fix arc blow problems
Equipment is more expensive as DC currents require an internal transformer to switch the current
Applications
DC welding is ideal for joining thinner metals as well as being used in most stick welding applications, including TIG welding of - steels. This form of welding is also good for overhead and vertical applications.
What is AC Welding?
An alternating current is an electric current that reverses its direction many times per second. A 60-hertz current will change its polarity 120 times per second. With AC welding, because the magnetic field and current rapidly reverse -direction, there is no net deflection of the arc.
Advantages
The advantages of AC welding are:
The alternating current between positive polarity and negative polarity allows for a steadier arc for welding magnetic parts
Fixes problems with arc blow
Enables effective aluminium welding
AC welding machines are cheaper than DC equipment
Disadvantages
The disadvantages of AC welding are:
More spatter
Weld quality is not as smooth as with DC welding
Less reliable and therefore more difficult to handle than DC welding
Applications
When switched to AC positive, it also helps remove oxide from the metal surface - hence it is suitable for welding aluminium.
AC welding is also widely used in shipbuilding, particularly for seam welds, as it has the ability to set the current higher than with DC. AC welding also offers fast fills and is used for down hand heavy plate welds.
One of the main uses of AC welding is with materials that are magnetised. This makes it useful for repairing machinery.
FAQ of DC Welding Machine
What welding rods are DC?
For DC welding, look for electrode 6010. It's intended for direct current use only. It has a high cellulose sodium-type coating. It provides better penetration and has many applications in the field.
Which is better for welding AC or DC?
DC polarity is used in most welding applications. It produces a smoother welding output compared to AC. It creates a more stable arc, easier welding and less spatter. You can also either use DC negative for faster deposition rates when welding thin sheet metal or use DC positive for more penetration into the steel.
What is difference between AC and DC welding?
AC and DC welding are forms of arc welding that use different currents to produce an electric arc. ' The DC polarity is constant while the AC polarity flows in one direction for half of the time and half of the time in the other, reverse, direction
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