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Method for overcoming welding deformation of end covers of large-size mills

A welding deformation and welding form technology, applied in welding equipment, welding equipment, auxiliary welding equipment and other directions, can solve problems such as easy deformation, and achieve the effect of improving product quality, improving welding quality and reducing repair rate.

Inactive Publication Date: 2013-12-18
LUOYANG JIANHAO HEAVY MACHINERY LIMITED
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Problems solved by technology

[0003] This invention aims at the situation that the end cover plate of the mill is easily deformed during the welding process, changes the welding groove welding form, changes the previous welding process, and requires the end The cover plate is first welded with the adjacent small tube section to form a small piece, and the deformation is checked. If the deformation is found to be out of tolerance (deformation) ≥ 3mm, use flame correction or 800T hydraulic press to correct

Method used

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  • Method for overcoming welding deformation of end covers of large-size mills
  • Method for overcoming welding deformation of end covers of large-size mills

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Embodiment Construction

[0008] 1. Change the groove shape, change the original groove angle from 60° to 50° figure 1 figure 2 .

[0009] 2. Change the welding process.

[0010] (1). Proper preheating during welding, the preheating temperature is 50°C.

[0011] (2) . For symmetrical welding, the inner weld seam is welded first, the outer root is cleaned, and the outer weld seam is welded. Because the inner weld seam is welded first, the end cover plate is stressed in the concave direction, and has a concave tendency. The outer root is cleaned, and after the outer weld is welded, a convex force that offsets the concave force can be generated, and the deformation of the end cover can be controlled.

[0012] 3. Weld the end cover plate with the adjacent small barrel section to form small parts, and then check the deformation. If the deformation is greater than 3mm, it can be corrected by 800T hydraulic machine or flame.

[0013] 21 mills welded by this method do not need to use 800T hydraulic pres...

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Abstract

The invention relates to a method for overcoming welding deformation of end covers of large-size mills. The method includes changing a welding form of a welding groove to change the conventional welding process, and welding the end covers with adjacent small shell rings into small pieces to improve welding quality of the end covers of the large-size mills. With the method, repair rate of products is reduced greatly, product quality is improved steadily and benefit of companies is increased.

Description

technical field [0001] The invention relates to a welding method, in particular to a method for overcoming the welding deformation of the end cover of a large mill. technical background [0002] Nowadays, there are many mill products, the volume is getting bigger and bigger, and the production difficulty is getting more and more difficult. In the production process, it is found that the end cover plate of the mill is convex or concave during the welding process. Because during welding, the thickness of the end cover plate is δ≥100mm, the thickness of the cylinder plate is δ≈50mm, the welding groove is relatively large, and there is a lot of filler metal. During welding, the thickness of the metal in the molten pool during the technical cooling process produces a huge If the stress cannot be released in time, it will rush in all directions. When the stress in a certain weak area exceeds the yield strength of the steel plate, the deformation of convex and concave will occur. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K31/02B23K33/00B23K37/00
Inventor 段建峰曹林权建军
Owner LUOYANG JIANHAO HEAVY MACHINERY LIMITED
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