Sheetcam — Hot Crack !!install!!

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Path Rules

To prevent defects like hot cracking or "weld crater" failures, operators use SheetCam’s to control the torch's behavior at critical points where heat accumulates: sheetcam hot crack

THC (Torch Height Control) Off-Commands

: For small circles or delicate features where heat buildup is a risk, you can use SheetCam to insert "THC Off" codes. This prevents the torch from diving into the molten metal if the voltage fluctuates due to heat . How to Implement These Strategies I assume you mean a short feature article

What is SheetCam?

Pro Tip:

Use a "Leadin Type" of Arc in your operation settings. This provides a smoother transition for the plasma arc, reducing the sudden thermal shock to the boundary layer of the part. 2. Path Rules and "Overburn" Path Rules To prevent defects like hot cracking

When the plasma arc superheats a localized area (often exceeding 30,000°F), the metal expands rapidly. As the cut progresses and the torch moves away, that area cools and contracts. If the geometry of the part (or the hold-down method) prevents this contraction, the steel literally pulls itself apart.

Effect:

The torch will continue past the start point of the circle or shape. This prevents the "hot crack" by ensuring the metal is fully severed before the arc terminates. 3. Lead-Outs

In thick plate (1" or more), this is catastrophic. The crack is often followed by a loud "ping" and a visible gap of 1/16" or more.