At the end of a closed loop, use the Overcut feature (typically 2mm to 5mm). This ensures the torch burns past the initial pierce point into scrap metal, preventing a cooling divot—and subsequent crack—on the finished part edge. 2. Fine-Tune Cut Speed and Tool Rules
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Here is a deep dive into why this happens and how you can use SheetCam’s powerful toolset to prevent it. What is Hot Cracking?
is a popular CAM software favored for its ability to generate G-code for complex CNC plasma metal art. However, when working with high-heat processes like plasma cutting, operators may encounter metallurgical issues known as "hot cracking" (or solidification cracking). sheetcam hot crack
Use nitrogen or an multi-gas mix (F5) to prevent oxidation and nitrogen depletion on the cut face, preserving the material’s corrosion resistance and ductility.
What and thickness are you currently cutting? Are you using plasma, laser, or oxy-fuel ? Where exactly on the part are the cracks appearing?
Do not extinguish the torch exactly where the lead-in meets the cut path. At the end of a closed loop, use
Using "Wiggle" lead-ins for thicker materials can help clear slag and manage the initial heat spike during piercing. Drill Routines for Thick Steel:
The finish of a cut is almost entirely dictated by the lead-in and lead-out strategy. A straight line plunge often leaves a noticeable divot or "dross nipple" because the arc takes a second to stabilize and turn off.
While hot cracking is a metallurgical issue, your CAM settings in directly influence the "heat input" and "stress" factors that cause them. 1. Optimization of Feed Rates Fine-Tune Cut Speed and Tool Rules user wants
To minimize the occurrence of hot cracks in Sheetcam:
To understand the defect, one must first define the mechanism of hot cracking. Unlike "cold cracking," which occurs after the metal has cooled and is often related to hydrogen embrittlement, hot cracking occurs at high temperatures, typically just above the solidus temperature of the material. As molten metal cools, it undergoes a transition from a liquid to a solid state. During this process, impurities and alloying elements with lower melting points—such as sulfur and phosphorus in steel, or silicon in aluminum—are pushed to the grain boundaries. These impurities form liquid films along the grain boundaries. If the thermal contraction stresses exceed the strength of these liquid films before the metal fully solidifies, the material separates internally, resulting in an intergranular crack.