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Plug welding repair technology for mammoth converter shell perforation

A welding repair, large converter technology, applied in welding equipment, manufacturing tools, arc welding equipment, etc., can solve the problems of easy cracking, large welding stress, complex process, etc., and achieve high production efficiency, reliable welding quality, and simple operation. Effect

Inactive Publication Date: 2012-10-10
ANHUI MASTEEL ENG & TECH GRP
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  • Description
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Problems solved by technology

The workload of this welding repair method is often relatively large, the process is complicated, and when the thickness of the furnace shell is large, the welding stress is large during single-sided welding, which is prone to cracks

Method used

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  • Plug welding repair technology for mammoth converter shell perforation

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Embodiment Construction

[0011] Taking 300 tons of converter shell burning perforation welding repair as an example below, to illustrate the large-scale converter shell perforation plug welding repair process of the present invention, the specific method is as follows:

[0012] 1) Welding method: manual arc welding + CO 2 Gas shielded welding plug welding, the thinning position is to use CO 2 Gas shielded welding surfacing.

[0013] 2) Welding sequence: Welding on the inner side of the furnace body, first by manual arc welding plug welding 1 / 3 depth, and then by CO 2 Gas shielded plug welding.

[0014] 3) Welding material: manual arc welding uses J507 ultra-low hydrogen electrode, specifications φ3.2, φ4.0, and the power supply adopts DC reverse connection. Dry the J507 ultra-low hydrogen electrode welding at a temperature of 350-400°C and keep it warm for 2 hours. The baked electrodes are placed in a 100°C heat preservation cylinder and taken out as needed. Wet welding rods are strictly prohibite...

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Abstract

The invention discloses a plug welding repair technology for a mammoth converter shell perforation, the technological method is that rust, greasy dirt, slag oxide and other sundries within the 200-millimeter scope at the periphery of a plug welding area are completely cleared up; a welding line back plate is welded at the outer part of a converter shell plug welding opening, and meanwhile, a heating sheet is hung for weld preheating; the inner part of a converter body is subjected to welding, the manual arc welding is firstly used for plug welding 1 / 3 depth, and then, the CO2 gas shield welding is used for plug welding; and postheat treatment is instantly carried out after completing the seam welding. The repair technology is simple to operate, and easy to carry out; and the production efficiency is high, and the welding quality is reliable.

Description

technical field [0001] The invention relates to a partial welding and repairing process of large-scale equipment made of low-carbon steel, low-alloy high-strength steel. technical background [0002] During the steelmaking process of large-scale converters, when the refractory bricks in the converter are damaged, it is easy to cause the shell of the converter to burn through. If it is not handled properly when welding and repairing the burnt hole of the converter, the repaired area will often become the source of damage to the converter shell. At present, in the repair method of burnt holes in the shell of large-scale converters, the method of local excavation and repair welding is more commonly used. The workload of this welding repair method is often relatively large, the process is complicated, and when the thickness of the furnace shell is large, the welding stress is large during single-sided welding, and cracks are prone to occur. Contents of the invention [0003]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/00B23K9/16B23K9/04B23K9/235
Inventor 张烨
Owner ANHUI MASTEEL ENG & TECH GRP
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