Steel structure cutting is aimed at the steel structure being cut. Generally speaking, it refers to the process of melting, slag blowing and segmentation of steel structure when industrial gas and oxygen are mixed to burn and reach the required cutting temperature. Steel structure is suitable for truss or grid structure, multi-storey or high-rise beam, column, frame structure and other industrial and civil buildings and general structures.
At present, the technologies used are flame cutting, water cutting, plasma cutting, CNC cutting, etc. Flame cutting is commonly used. It has the characteristics of low cost, simple operation, mature technology and wide use. It is a widely used cutting technology in the industry. Flame cutting refers to the use of industrial natural gas and oxygen mixed combustion flame to heat the cut metal to the melting point of steel, and then release high-pressure oxygen flow, so that the metal is further violently oxidized and the slag generated by combustion is blown The process of forming a cut.
Oxygen cutting or gas cutting is to melt the steel with the high temperature generated by the combustion of oxygen and fuel, and blow the slags away by the jet pressure, resulting in the slit, so as to achieve the purpose of cutting the steel structure. However, gas cutting is not suitable for materials with melting point higher than flame temperature or difficult to oxidize. The flame temperature of oxygen and various fuels is 2000-3200 ℃. Gas cutting can cut steel of various thicknesses with flexible equipment, economic cost and high cutting accuracy. It is a widely used cutting method at present. According to the classification of cutting equipment, gas cutting can be divided into artificial gas cutting, semi-automatic gas cutting, imitative gas cutting, multi head gas cutting, numerical control gas cutting and photoelectric tracking gas cutting. Plasma cutting is suitable for stainless steel, aluminum, copper and their alloys, etc. it is widely used in some technologies. It has the characteristics of high cutting temperature, strong scouring force, good cutting edge quality, small deformation and can cut any high melting point metal.
Natural gas cutting is a new technology developed in recent years, which has the advantages of low carbon, environmental protection, safety and stability, low cost, rich gas sources, etc. it is a technology vigorously promoted by the state, and has the prospect of wide expansion. The flame temperature of ordinary natural gas combustion with oxygen can not reach the flame temperature of acetylene combustion with oxygen, so it is necessary to add temperature increasing combustion supporting additives to react with gas After activation and heat accumulation, the cutting temperature required for natural gas cutting can be achieved.