What is Double Arcing in Welding?
When welding or cutting with a plasma arc torch, double arcing can occur if the arc does not pass through the constricting orifice but instead transfers to the inside surface of the nozzle. This can happen if the gas flow is disrupted or if the torch is not held at the correct angle.
Double arcing creates a secondary arc between the outside surface of the nozzle and the workpiece. This can cause problems with the weld, including porosity and lack of fusion. It can also damage the torch nozzle.
To prevent double arcing, make sure that the gas flow is not disrupted and that the torch is held at the correct angle. If double arcing does occur, stop welding and replace the torch nozzle.
Advantages of Double Arcing
There are several advantages of double arcing:
- It produces a more focused and concentrated arc, which can be beneficial for welding thin materials.
- The heat is more evenly distributed, which can help to reduce warping.
- It can be used to weld in difficult-to-reach places.
Disadvantages of Double Arcing
While double arcing has some advantages, there are also some disadvantages:
- The secondary arc can damage the torch nozzle.
- If not done correctly, it can cause problems with the weld, including porosity and lack of fusion.
- Double arcing can be difficult to control, so it requires a skilled welder.
What is plasma arcing?
Plasma arcing is a process that uses a plasma arc torch to create an ionized gas flow. The ions in the gas flow are attracted to the electrode, causing an arc to form. The plasma arc torch can be used for welding, cutting, or other applications.
Why DC supply is used in carbon arc welding?
Carbon arc welding uses a DC power supply because it provides a more stable arc than an AC power supply. The DC power supply also allows for more control over the welding process, which is helpful when welding thin materials.
Related Links
A mechanism that triggers double arcing during plasma arc cutting – IOPscience
Numerical investigation of the double-arcing phenomenon in a cutting arc torch
(a) Normal mode of arc operation. (b) Double arcing | Download Scientific Diagram
A mechanism that triggers double arcing during plasma arc cutting – IOPscience
Normal operation (a) and double arcing (b) during plasma arc cutting:… | Download Scientific Diagram
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