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Batch welding electric slag re-melting method for jacking core rods

A technology of nesting mandrel and electroslag remelting, which is applied in welding equipment, manufacturing tools, metal processing equipment, etc., can solve the problems of poor tissue compactness and low purity of nesting mandrel, and achieve compact structure and various Excellent performance, the effect of pure steel

Active Publication Date: 2012-01-04
INNER MONGOLIA NORTH HEAVY INDS GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the low purity and poor compactness of the nesting mandrel, it cannot be directly used in products, and can only be used as a return charge for steelmaking.

Method used

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  • Batch welding electric slag re-melting method for jacking core rods
  • Batch welding electric slag re-melting method for jacking core rods
  • Batch welding electric slag re-melting method for jacking core rods

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Embodiment

[0013] Embodiment: Taking a 20t electroslag furnace as an example, according to the weight of the remelted steel ingot, select 6 to 18 nesting mandrels 1 with a diameter of φ200 to 300mm with similar chemical composition as electrode blanks and weld them in batches to form consumable electrodes. A connecting plate 3 is welded between the dummy electrode 2 and the sheathing mandrel 1, and the connecting plate 3 is a Q235 steel plate with a thickness of 50 mm. Before assembly welding, first determine the central position of the connecting plate 3 in the horizontal direction, and then determine the number and position of the sleeve mandrel 1 that can be welded at the center of the connecting plate 3 according to the diameter of the batch mandrel 1, press here The method finds out the welding positions of the casing mandrel above the second layer around the central position in turn. When welding, cut all the ends of the sleeve mandrels neatly, place them horizontally and lay them ...

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Abstract

The invention relates to a batch welding electric slag re-melting method for jacking core rods, and belongs to the field of electric slag furnace melting processes. The method comprises the following steps of: welding a connecting plate between the jacking core rods and a pseudo electrode, determining the welding position on the connecting plate according to the number and specification of the jacking core rods, trimming the ends of the jacking core rods, keeping the longitudinal welding bead length between the jacking core rods at 130 to 150 millimeters, and keeping the center of each electrode blank vertical to the end face of the pseudo electrode after batch welding; and according to the filling ratio, slag quantity, inter-electrode distance control and power setting parameters in the electric slag re-melting process, selecting a refining slag system for adding in a weight ratio of CaF2: Al3O2: SiO2 of 66: 28: 6 before re-melting, and adding Al-Mn-Si powder composite deoxidizer at intervals of 10 minutes during re-melting. The method realizes a process of batch welding re-melting of multi-electrode blanks in one furnace and effectively controls the easily oxidized elements from being burnt; the electric slag ingot tissue is compact, and the steel is pure so that the jacking core rods are directly converted into products by electric slag re-melting, and reutilization of materials is realized.

Description

technical field [0001] The invention relates to an electroslag remelting method for group welding of nested mandrels in batches, belonging to the field of electroslag remelting. Background technique [0002] At present, enterprises that process and manufacture thick-walled steel pipes use electroslag remelting, forging and nesting forming processes for production. Due to the low purity and poor compactness of the nesting mandrel, it cannot be directly used in products, and can only be used as a return charge for steelmaking. Contents of the invention [0003] The purpose of the present invention is to provide a method of electroslag remelting for batch welding of mandrels that can only be used as a return charge and directly used in products, realizing the reuse of materials, reducing costs and increasing efficiency . [0004] Technical solution: In the present invention, firstly, the mandrels with similar chemical composition are selected as the electrode blanks for gro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B9/18B23K31/02
Inventor 张奇志胡永平梁琦刘延斌董立王宏奭王尚贵王立功
Owner INNER MONGOLIA NORTH HEAVY INDS GROUP
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