Welding method for plates of ladle turret

Abstract

The invention discloses a welding method for plates of a ladle turret. The technical scheme includes the step 1, plate groove processing, the step 2, weldment assembling, the step 3, preheating before welding, the step 4, welding equipment and material selecting, the step 5, welding of the ladle turret, the step 6, processing after welding, and the step 7, nondestructive detection. All welded joints are subjected to complete ultrasonic detection after the welding is ended for 24 hours. By the welding method for the plates of the ladle turret, the one-step successful welding of the ladle turret can be guaranteed, cold fraction is decreased and even eliminated, certain low-temperature toughness of the ladle turret is guaranteed, welding efficiency of the ladle turret is improved, welding quality of welded joints is also guaranteed, and production cost is lowered.

Description

Technical field [0001] The invention belongs to the welding process of steel-making equipment, and specifically is a steel-making large package turntable [0002] The welding method of the plate. Background technique [0003] The ladle turntable is used to transport the molten steel in the ladle from the initial position to the casting position. The lifting arm can be lifted and lowered independently. Since there is a ladle seat in each of the two directions at 180°, continuous casting can be realized. The size of the turntable is 6450. *5520*3120, the thickest part of the plate is 130mm, the thinnest part is 40mm, and the weight is 368t. Two ladle molten steel can be placed on the support of the turntable at the same time. The traditional large package turntable is mainly made of Q345B steel, and the welding method is mainly manual arc welding; because Q345B steel belongs to ordinary low-alloy high-strength steel, the yield point is 345MPa, and the impact energy at 20℃ is not ...

AI Technical Summary

Problems solved by technology

The traditional bale turntable is mainly made of Q345B steel, and the welding method is mainly manual arc welding; because Q345B steel is an ordinary low-alloy high-strength steel, the yield point is 345MPa, and the impact energy at 20°C is not less than 34J, S , P content is less than or equal to 0.04%. Under normal circumstances, the carbon equivalent of this steel is less than 0.4%, and the weldability is good, but it is prone to cold cracks when welding at low temperature, open-air work, or under the conditions of high rigidity and thick plates. At the same time, due to the relatively high content of S and P impurities in steel and poor low-temperature toughness, it seriously affects the service life of the ladle turret. Since the main function of the ladle turret is load-bearing, it is required to have a certain resistance to lamellar tearing performance, while the traditional Q345B board does not have this performance

At the same time, in the manufacturing process, the traditional manual electric welding operation not only consumes a lot of manpower and material resources, but also has extremely low work efficiency, and the weld is prone to fatal defects such as slag inclusions and cracks, which brings huge losses.