Jasic Cut 45 - Advanced Plasma Cutting Techniques; Piercing Procedure; Bevelling Procedure

13
Piercing
Piercing is the process in which a quick hole is made in the workpiece. Piercing is oen just a starng hole that will be used to make a
circular cut within the workpiece.
You can use standard cung ps for piercing although ensure the plasma machines output amperage matches the cung ps amperage
rang. No accessories are required when piercing.
The thickness of the material to be pierced will need to fall in the proper amperage range for the machine and p you will be using.
There are two dierent techniques for piercing depending on the thickness of the workpiece. If the work piece is less than 2mm sheet metal,
the torch should be held at a 15°-30° angle with the cung p touching the workpiece.
Begin by establishing the pilot arc, as soon as the pilot arc penetrates the workpiece, use a smooth, rolling moon to move the torch to a 90°
(perpendicular) angle. At this point, the pierce has been created in the workpiece allowing you to begin the cung process. If the material
being cut is thicker than 2mm the torch should be held at a 90° (perpendicular) angle approximately 12mm or more above the workpiece.
Begin by establishing the pilot arc and slowly move the torch towards the workpiece unl the cung arc transfers.
Once the transfer has occurred, hold the torch sll unl the arc exits the boom of the workpiece.
Once the pierce has been made, the torch can be lowered to normal cung height and the cung process can begin.
Bevelling
Bevelling allows you to angle the edge of a at plate or pipe to allow for deeper weld penetraon.
This process is normally used for materials that are 9mm or thicker. You can ulize standard cung ps for bevelling, again you need to
ensure you ulize the correct plasma machine amperage to match the cung ps used.
Ensure that the thickness of the material to be bevelled falls in the amperage range of the plasma machine and cung p that you will be
using. If bevelling by hand, a roller and/or angle guide can be helpful in maintaining the consistent bevel face and the desired angle which is
usually determined by the weld joint design.
The industry standard angle ranges are from 15°-45°. The cung p would normally be between 3–6mm from the workpiece.
Plasma Cung Techniques
Wilkinson Star Technical