These cracks often appear along the centerline of a cut or weld.
A hot crack is a fracture that forms as the metal solidifies from a molten state. In CNC plasma or laser cutting, the cutting torch melts through the metal, creating a localized pool of molten material. As the torch moves away, this molten edge cools rapidly. Why Do Hot Cracks Occur? sheetcam hot crack
SheetCam does not physically cut the metal, but its instructions dictate the speed, path, and duration of heat exposure. Errors in your SheetCam tooling or operation setups can severely exacerbate thermal stresses. 1. Poorly Configured Lead-Ins and Lead-Outs These cracks often appear along the centerline of
If the pierce delay in SheetCam is set longer than necessary, the torch sits stationary over the molten pool, transferring excessive thermal energy into the surrounding plate before the XY motion even begins. As the torch moves away, this molten edge cools rapidly
Use SheetCam to configure an "overcut" or a specific lead-out path. Abruptly stopping the arc can leave a "crater" that is highly susceptible to cracking. A smooth lead-out helps distribute the cooling stress more evenly. 3. Corner Looping
Setting a small overburn (cutting slightly past the start point) ensures the metal is fully severed, preventing the mechanical "tearing" that happens when a part is forced out of the skeleton. 3. Heat Management through Cut Sequencing
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