Device and method for welding blast furnace flange

Abstract

The invention provides a device and a method for welding a blast furnace flange. The device is simple in structure, convenient to install, high in welding quality and efficiency and low in labor intensity and comprises a positioning device, a rotating device and an automatic arc-submerging welder. The positioning device comprises an upper layer of universal shaft seat and a lower layer of universal shaft seat, the upper layer is provided with a flange large opening positioning universal shaft seat, the lower layer is provided with a large sleeve and small opening positioning universal shaft seat, the flange large opening positioning universal shaft seat and the large sleeve and small opening positioning universal shaft seat are respectively fixedly arranged on the upper end surface and the lower end surface of the flange through a flange large opening fixing device and a large sleeve and small opening fixing device, and the flange large opening positioning universal shaft seat and the large sleeve and small opening positioning universal shaft seat are fixed through a connection device. The rotating device comprises a flange large opening rotating rod, wherein one end of the flange large opening rotating rod is connected onto a universal shaft of the flange large opening positioning universal shaft seat and can rotate freely around the flange large opening positioning universal shaft seat, and the other end of the flange large opening rotating rod is connected onto the automatic arc-submerging welder and can drive the automatic arc-submerging welder to rotate around the circumference of the flange. The device is light, fast and convenient to operate, solves problems of low labor efficiency and large labor intensity of manual welding, simultaneously solves problems of low ultrasonic test (UT) nondestructive testing qualified rate, welding joint deformation caused by reworking and interior welding residual stress, ensures interior quality and appearance quality of welding, reduces labor intensity, quickens project process, and prolongs service life of a furnace casing.

Description

technical field [0001] The invention relates to a welding method for a round flange of a blast furnace, in particular to a welding device and method using a submerged arc welding machine and an auxiliary positioning and rotating device. Background technique [0002] With the development of the economy, the quality awareness of customers has generally improved. Restricted by the site conditions, the welding quality of the blast furnace tuyere flange cannot be guaranteed on site, and the factory welding of the furnace shell flange has become an irreversible trend. [0003] For a long time, the welding of the tuyere has been done by hand welding or CO 2 Gas shielded welding, such as using handle welding, has low labor efficiency, high labor intensity, and low pass rate of UT nondestructive testing; if CO 2 Gas shielded welding has high labor intensity, low pass rate of UT non-destructive testing, and poor appearance; on the one hand, rework increases labor intensity, the progr...

AI Technical Summary

Problems solved by technology

[0003] For a long time, the welding of the tuyere has been done by hand welding or CO 2 Gas shielded welding, such as using handle welding, has low labor efficiency, high labor intensity, and low pass rate of UT nondestructive testing; if CO 2 Gas shielded welding has high labor intensity, low pass rate of UT non-destructive testing, and poor appearance; on the one hand, rework increases labor intensity, the progress cannot be guaranteed, and it has a negative impact on the furnace shell material, increasing weld deformation and internal welding residual stress

Ultimately, the welding quality of the tuyere flange cannot meet the requirements, causing cracks in the furnace shell during use, thereby reducing the service life of the blast furnace

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