Large-scale tube body welding technology

Abstract

The invention discloses a large-scale tube body welding technology. The large-scale tube body welding technology includes the steps that blanking of tube body steel plates is carried out, the circumference within 120mm is subjected to ultrasonic flaw detection, and qualification is required to reach the level II; and splicing grooves are formed in annular plates, straight slit grooves are formed in tube bodies, dye penetrant inspection is carried out after grinding, and the length of the tube body steel plates is 2-3mm less than the actual size length; the annular plates are spliced, manual welding is adopted for priming, weld preheating is carried out with the preheating temperature being equal to or greater than 100 DEG C, end tabs are added for submerged-arc welding, the submerged-arc welding is carried out after regulation of working faces and back gouging, and heat preservation is carried out after welding; plates are rolled, straight slits are welded after the plates are bent toa round shape, the manual welding is used for priming, the preheating temperature is equal or greater than 100 DEG C, end tabs are added for submerged-arc welding, the submerged-arc welding is carriedout after the regulation of the working faces and the back gouging, and tube segments are rewound after welding. The large-scale tube body welding technology is simple, welding defects can be avoidedduring welding, the stability of the welding can be ensured, and high strength and good stiffness after welding of the tube bodies can be achieved.

Description

Technical field: [0001] The invention relates to the field of cement production, in particular to a large cylinder welding process. Background technique: [0002] When processing large cylinders such as mills, incineration kilns, and drying kilns, due to the immaturity of the existing welding process, welding defects and stress concentration problems occur in the cylinder, and the stability of welding performance is not good. Invention content: [0003] The technical problem to be solved by the present invention is to provide a large-scale cylinder welding process that is convenient for welding and has good welding effect. [0004] The technical solution of the present invention is to provide a large-scale cylinder welding process, which includes the following steps: the steel plate of the cylinder is blanked, and the circumference of the ultrasonic flaw detection is 120mm, which is required to be qualified at level II; the second step is to open the splicing groove of the...

AI Technical Summary

Problems solved by technology

[0002] When processing large cylinders such as mills, incineration kilns, and drying kilns, due to the immaturity of the existing welding process, welding defects and stress concentration problems occur in the cylinder, and the stability of welding performance is not good