The arc pit is a decline generated at the end of the weld, which will weaken the intensity of the weld and produce cracks during the cooling technology.
Measures that ensure that the size of the weld meets the requirements include technologying the welded slope in accordance with the design requirements and welding specifications, the appropriate welding technology parameters, and the guarantee of the welders are proficient.
The main methods of detecting pressure container welding internal defects include non -destructive detection, such as ray detection, ultrasonic detection, magnetic powder detection and penetration detection.
Pressure container welding defects are mainly divided into external defects and internal defects. External defects such as bite, welding tumors, etc., internal defects such as cracks and residue.
Measures to reduce welding cracks include selecting the right welding material, optimizing the welding technology parameters, controlling welding thermal input and cooling speed, and performing after welding heat treatment.
Welding cracks are one of the most fatal defects of pressure vessels, which will cause the container structure to damage and seriously affect the safety and service life of the container.
Gas protection welding mainly includes TIG (non -melting pole arc welding), MIG (melting polar arc welding), and CO2 gas protection welding.
Tungsten pole arc welding is mainly suitable for occasions with higher welding quality requirements, such as bottom welding of ball shell welding.
Buried arc automatic welding has high production efficiency, good weld quality, good labor conditions, saving energy and materials, but it is only suitable for flat welding or horizontal welding, and it is difficult to use in complex locations.
