Air-arc cutting of metal

Operating principle at air-arc cutting This process involves melting the metal at the cutting point with an electric arc and removing the molten metal with compressed air under the action of the melting arc. The air is supplied along a non-consumable electrode secured in an electrode holder. The electrodes used in this process are typically graphite or carbon.

Air-arc cutting with carbon electrode 6-12 mm in diameter, allows for the best possible increase in productivity, with a welding current of 300-1500 A, and arc voltage maintained by a direct current of reverse polarity. During operation, the arc has poor stability and frequent interruptions. air-arc cutting It is taken into account that the lower the electrode wear rate, the more efficient the cutting process. Therefore, it is more advisable to use electrodes with a protective and relieving layer of copper or a copper-based composition.

Perhaps a significant drawback air-arc cutting The poor quality of the cut surface is a sign of poor quality. For example, on edges 0.1-0.3 mm deep, cracks are observed, caused by increased carbon content. To reduce the percentage of carburization, it is best to avoid touching the hot metal with the electrode when welding, if possible. After cutting, be sure to thoroughly clean the surface with a brush until it has a metallic sheen and inspect it for any possible defects.

Air-arc cutting It is often used for surface treatment, such as separating scrap steel, aluminum, copper, and titanium. It can cut alloy and high-alloy steel, carbon steel, cast iron, and some non-ferrous metals, such as bronze, brass, aluminum, and alloys. When properly performed, the molten metal is completely removed and the metal surface remains unchanged in composition, thanks to the brief heating period.

Air-arc cutting with carbon electrode This is performed with direct current (DC) and is used for cutting cast iron, non-ferrous metals, and steel. However, when working with this electrode, the cutting width and quality are not very reliable. Cutting can also be done with AC, provided the surface is positioned at a slight angle to the horizontal plane to allow the liquid metal to flow out. With a carbon electrode thickness of 10 mm and a metal thickness of 6 mm, the current will be 400 dB and the cutting speed will be 21 m/h. With a metal thickness of 16 mm, the speed will be significantly lower: 10.5 m/h.

Equipment for air arc welding A welding torch consists of a starting device, a mandatory power source, a welding cable, an air supply hose, a cutting torch, and an air compressor. If it's a workshop, the air supply hose is connected to the local air duct. In construction, the RVD (23.7) cutting torch is commonly used. It consists of a small body with a handle, an air valve that connects to the handle, a cable, and a hose. It also has metal movable and fixed jaws that grip the carbon electrode.