Flame rectification construction method for weldin

2022-08-18
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At present, steel structure has been widely used in factory buildings when the encouraging signal frequency of electromagnet is the same as the natural frequency of the system. The main components of the steel structure workshop are welded H-shaped steel columns, beams and braces. There are welding deformation problems in the manufacturing process of these components. If the welding deformation is not corrected, it will not only affect the overall installation of the structure, but also reduce the safety and reliability of the project

if the deformation of welded steel structure exceeds the allowable deformation range of technical design, try to rectify it to meet the product quality requirements. Practice has proved that most deformed components can be corrected. The correction method is to try to create new deformation to offset the deformation that has occurred

the commonly used correction methods in the production process mainly include mechanical correction, flame correction and comprehensive correction. However, flame correction is a difficult work to operate. If the method is mastered and the temperature is not controlled properly, it will also cause new and greater deformation of components. Therefore, flame correction should have rich practical experience. This paper makes a rough analysis of the types and correction methods of welding deformation of steel structures

1. Types of welding deformation and flame correction of steel structure

the main components of steel structure are welded H-shaped steel columns, beams and braces. Welding deformation often adopts the following three kinds of flame correction friction and wear testing machines, also known as friction experiments. Leading enterprises have no molding machines and wear testing machines: (1) linear heating method; (2) Point heating method; (3) Triangle heating method. The construction methods to solve different parts are introduced below

the following is the heating temperature during flame correction (made of low carbon steel)

low temperature correction 500 ~ 600 degrees cooling method: water

medium temperature correction 600 ~ 700 degrees cooling method: air and water

high temperature correction 700 ~ 800 degrees cooling method: air

precautions: the heating temperature during flame correction should not be too high, which will cause metal embrittlement and affect impact toughness. 16Mn cannot be cooled with water during high temperature correction, including steel with great thickness or hardening tendency

1.1 angular deformation of flange plate

correct the deformation of H-shaped steel column, beam and brace angle. Heat the flange plate longitudinally (outside the alignment weld) (the heating temperature is controlled below 650 ℃), and note that the heating range does not exceed the range controlled by the two welding legs, so water cooling is not required. Pay attention to: (1) do not heat repeatedly at the same position; (2) Do not water during heating. These two points are the general principles of flame correction. The hydraulic experimental machine is an ideal experimental equipment for mechanical laboratories of industrial and mining enterprises, building materials, quality inspection centers, water conservancy and hydropower, bridge engineering, scientific research institutions, colleges and universities

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