What is Piercing in Welding?
Piercing is a method of starting a plasma arc cut in which the arc plunges into and through the workpiece before cutting begins. This method is used when the workpiece is too thick to be cut with a standard torch tip, or when it is necessary to make a hole in the workpiece before cutting begins.
Piercing is also sometimes used to create a starting point for cutting on a curved or irregular surface. In this case, the arc is plunged into the workpiece at an angle, creating a small divot that can be used as a reference point for subsequent cuts.
What are the advantages of Piercing in Welding?
Piercing has a number of advantages over other methods of starting a plasma arc cut.
- The main advantage is that it allows the arc to be started in a thick workpiece that would otherwise be too difficult or impossible to cut with a standard torch tip.
- Piercing also provides a more stable starting point for cutting on irregular or curved surfaces. This can be helpful in preventing the arc from wandering off course during the cutting process.
- Finally, piercing can be used to create a starting point for cutting on a surface that is not flat, such as a pipe or tubing. This can be helpful in preventing the arc from sliding off the surface during the cut.
What are the disadvantages of Piercing in Welding?
Piercing has a number of disadvantages that should be considered before using this method to start a plasma arc cut.
First, piercing is generally more difficult than other methods of starting a plasma arc cut. This is due to the need to maintain a stable arc while plunging it into the workpiece. However, it can be useful in certain situations where other methods would not be possible.
Second, piercing can damage the workpiece if not done carefully. The heat of the arc can cause the workpiece to melt or deform, and the force of the arc can cause it to break or chip.
Finally, piercing can create hazardous fumes and dust that can be harmful to both the operator and any bystanders. It is important to take precautions to avoid inhaling these fumes and to protect the eyes and skin from the welding arc.
Piercing is a method of starting a plasma arc cut that has both advantages and disadvantages. It is important to weigh these factors carefully before deciding whether or not to use this method in any given situation.