Sheetcam Hot Crack __full__ [ 360p 2025 ]

Material selection plays a pivotal role in the susceptibility to hot cracking. Austenitic stainless steels and aluminum alloys are notably more prone to this defect than carbon steels. In stainless steel, for instance, a small amount of delta ferrite is often required in the microstructure to "pin" the grain boundaries and prevent the formation of continuous liquid films. When a fabricator uses SheetCam to cut these sensitive materials, the thermal cycle of the cutting process can alter the phase balance. If the material subsequently undergoes welding without proper procedural controls—such as appropriate filler metal selection or pre-heating—the combination of the cut-edge microstructure and the welding heat can precipitate a hot crack.

Set up a rule in SheetCam to "Decrease Amperage on Corners" or "Disable Height Control / Speed Up."

They develop at elevated temperatures, often just as the metal transitions from liquid to solid. How SheetCam Helps Prevent Hot Cracks sheetcam hot crack

Apply speed constraints on corners, but avoid excessive slowdowns

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 Material selection plays a pivotal role in the

"Hot cracking" (or solidification cracking) in CNC plasma and laser cutting occurs when metal cools and shrinks too rapidly, forming fissures immediately after a cut

A hot crack (or solidification crack) occurs at high temperatures during the solidification phase of a weld or thermal cut. When a plasma arc pierces or finishes a cut, the localized metal reaches its melting point. As the torch moves away or shuts down, this molten zone cools rapidly. When a fabricator uses SheetCam to cut these

Increase your cutting feed rate in the SheetCam tool table. Moving faster reduces the heat transfer to the material.

: This feature allows you to prioritize cutting internal holes before the outer profile. This ensures the part remains stable and connected to the larger sheet for as long as possible, distributing heat more evenly across the material .