THERMAL DYNAMICS Ultra-Cut new bevel cutting parts and cut charts will make it a lot easier to find the correct setting for standard bevel cutting applications on mild steel up to 50 mm and 45 deg. Below is a small introduction into bevel cutting.

Basics of Plasma Beveling

The edges of a part can be cut at an angle to allow for welding or special fit-up with other parts. A plasma bevel system can be used to make top bevels or bottom bevels. A “top” or “bottom” bevel requires only one pass around the part.

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A top bevel creates a bevel facing the top of the part. This requires that the remnant plate be lifted from the table first, in order to retrieve the part.

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A bottom bevel places the beveled face on the bottom of the part, allowing the part to be removed from the table prior to the remnant

Top Bevel Scrap Scrap Scrap Part Travel Positive Bevel on Part

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Generally, top bevel cuts produce a better quality cut part than bottom bevels. On bottom bevel cuts, burnback occurs on the top of the part, and irregularities result on the face of the cut.

Plasma bevel systems can also be used to cut bevels with a “land” or “nose” on the finished part. A bevel cut with a land will require two cut passes. When cutting multiple passes, it is important to always cut the bottom cut, or the longest cut first. Therefore, a bottom bevel with nose would require the bevel be cut first. The nose, or straight cut would occur on the second pass.

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A top bevel with nose would require the nose, or straight cut, to be cut first. The bevel cut would occur on the second pass.

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Three pass cuts are possible under limited circumstances. However, due to the complexity of programming, and the limita tions of the process, three pass beveling is not recommended for production cut parts.

Due to plasma cutting torch limitations, the maximum thickness that can be beveled depends on the bevel angle to be cut. When bevel cutting at 45°, the actual cut thickness is 1.4 times the plate thickness. The actual cutting thickness for a given plate thickness and bevel angle is determined using this formula:

Actual Cut Thickness = Plate Thickness / cos(θ

BEVEL DATA for Ultra-Cut XT 6 Manual 0-5554

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