For cutting mild steel, oxy-fuel cutting provides a dependable, precise, and competitive cutting ᴍᴇᴛʜod. When autoᴍᴀᴛɪɴɢ this cutting procedure, what function should you consider? After all, the goal is to shorten the fitting and welding processes by improving the quality of the complete fitting shape.
Oxy-fuel cutting: the basics
The steel must first be heated to ignition temperature at the cutting spot by the cutting torch before cutting. The steel is still solid but has ʟᴏsᴛ its ability to protect against oxygen at this temperature of about 960°C. The heated region is subsequently exposed to pure oxygen through the nozzle. Through an exothermic process, this fine and high-pressure oxygen stream transforms preheated and unprotected steel into oxidized liquid steel.
Because the liquid slag in this mixture has a lower melting point than steel, the oxygen stream can blow it out of the cavity without harming the solid, unoxidized steel. As the torch moves, a cut is produced by this ongoing exothermic reaction. The cutting torch keeps the steel hot while cutting in order to maintain the exothermic reaction. This ᴍᴇᴛʜod can only be used to cut metals whose oxides have melting points lower than the base metal itself. In any other case, the metal immediately stops oxidizing by producing a protective crust. Only mild steel and some low alloys can be efficiently cut using the oxy-fuel ᴍᴇᴛʜod and meet the aforementioned requirements.
Oxy-fuel cutting takes time, especially when cutting materials with thick walls. A cut parallel to the wall is the one that travels the least distance through the material. When making a beveled cut, the cutting torch will be at an angle, which will result in less heat being transferred to the material than when making a perpendicular cut, but a longer cut. To ensure a precise angled cut, speed control automation is needed. The cutting speed can be greatly increased by installing a second oxy-fuel torch perpendicular to the material and running it in front of the cutting torch. This pre-heater should only be triggered for angles steeper than 30° in order to prevent needless gas usage.
The cutting torch is lifted upwards during piercing to protect the cutting tip from splatter, and after the material is punctured, it is moved back to the ideal torch-to-material distance for cutting. An alternative to this piercing technique is to pierce while holding the torch at a small angle to shield the cutting tip from spatter while simultaneously shielding the underside of the cut material from the splatter.
The surface to be sliced is first penetrated during piercing, which uses the same exothermic ᴍᴇᴛʜod as cutting. The surface will first be heated, and then oxygen will be sprayed via the nozzle, turning the solid, previously heated steel into liquid, oxidized steel. Spatter happens during this procedure because the oxygen during piercing blows the slag away upwardly. The gas flow and cutting process may be adversely affected by this spatter’s ability to adhere to the cutting tip.
Let’s see Amazing Oxy Fuel Gas Cutting Machines, High Speed CNC Laser Cutting Machine Metal Sheet in the ᴀᴡᴇsome video below.
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Video resource: LA Machines
