Haz Zone Sheet Metal Cutting

The thermal effect of co 2 high power laser cutting on cut surface of steel plates is investigated.

Haz zone sheet metal cutting.

In welding the heat affected zone haz is the area of base material either a metal or a thermoplastic which is not melted but has had its microstructure and properties altered by welding or heat intensive cutting operations. Most sheet metal cutting techniques are based on localized melting of the material see figure 1. The heat affected zone can alter the sheet metal figures as declared by the rolling mill to a great extent. What is the heat affected zone.

It can often be recognized by a series of brightly colored bands also visible near welds. A heat affected zone haz is the portion of the base metal that was not melted during brazing and cutting welding but whose microstructure and mechanical properties were altered by the heat. The heat from the welding process and subsequent re cooling causes this change from the weld interface to the termination of the sensitizing temperature in the base metal. The haz is the area between the weld or cut and the base unaffected parent metal.

This alteration can be detrimental causing stresses that reduce the strength of the base material leading to catastrophic failures. During metal cutting or metal welding the metal absorbs the generated heat. The effect of the input laser cutting parameters on the melted zone depth mz the heat affected zone depth haz and the microhardness beneath the cut surface is analyzed. The short answer is that a heat affected zone is an area where the metal s metallurgy is changed like it would be through heat treating.

When forming the haz can make it difficult to manage the bending angle because it becomes impossible to foresee how metal will behave after a heat intensive cutting process. A mathematical model is developed to relate the output process parameters to the input laser cutting parameters. It often can be recognized by a series of brightly colored bands also visible near welds. The area between the melt part and the unaffected base metal undergoes chemical and structural modifications and is called heat affected zone haz.

Reduce the surface s exposure to high heats and the haz will not spread as quickly. For example waterjet cutting tends to produce no haz and may be a viable solution for sheet metal cutting whereas thermal cutting produces too large a haz on sheet metal and therefore should not be used. The heat affected zone haz is a non melted area of metal that has undergone changes in material properties as a result of being exposed to high temperatures. A zone is formed between the melted metal and the unaffected base metal called the heat affected zone haz.

This heat transmits away from the cutting edge through the metal body as metal is a good heat conductor. Since the haz is localized though you ll just get a hard area only around the flame cut edges. It s called the heat affected zone haz. Colors are caused by.