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The flatness of the cut surface refers to the highest and lowest points on the cut surface of the measured part, and the distance between two parallel lines made according to the tilt direction of the cut surface. When CNC cutting machine uses high-energy ion arc cutting, in order to ensure the consistency of the incision width, comprehensive analysis of parameters in all aspects needs to be considered. This involves the cutting material material, the proportion of various metal content, and the height of the cutting torch during the cutting process. Under normal circumstances, there is a 0.25 to 3.80mm thick melted layer on the surface of the plasma arc cut, but the chemical composition of the cut surface is not changed.
Plasma cutting is the use of plasma arc through the material surface to achieve cutting effect, plasma arc often cut more metal from the lower part of the upper part of the incision, the incision end surface is slightly inclined, the upper edge is generally square, but sometimes slightly rounded. The distance between the two cutting surfaces on the upper edge of the incision may be caused by the cutting beam. In the case where the upper edge of the cut-out melts, the distance between the two cut surfaces immediately below the melted layer is abnormal.
For example, in the case of cutting an aluminum alloy containing Mg 5%, although there is a 0.25 mm thick molten layer, the composition is unchanged and no oxide is present. If the cutting surface is directly welded, dense welds can also be obtained. When cutting stainless steel, chromium carbide does not precipitate along grain boundaries because the hot zone quickly passes the critical temperature of 649°C. Therefore, cutting stainless steel with a plasma arc does not affect its corrosion resistance.
The incision width of the arc cutting of the numerical control plasma cutter is 1.5 to 2 times wider than the incision width of the oxygen-acetylene incision. As the thickness of the incision increases, the incision width also increases. For stainless steel or aluminum with plate thickness less than 25mm, it can be cut with low-current plasma arc. The straightness of the incision is very high. Especially for cutting plates with thickness less than 8mm, small corners can be cut out, even without processing. Direct welding, which is difficult to obtain with high-current plasma arc cutting. This facilitates the irregular curve cutting of the sheet and the cutting of irregular holes.
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