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Vertical symmetrical welding method for wide and thick plates

A symmetrical welding, wide and thick plate technology, applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve the problems of tight production cycle, unsuitable full-scale welding, and poor control of welding deformation.

Active Publication Date: 2015-03-04
CHINA ERZHONG GRP DEYANG HEAVY IND
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method solves the problem of overall finishing in Solution 1, achieves good assembly through early-stage welding control, and solves the pressure of products being repeatedly fed into the furnace once repairs occur; Open group welding is easy to cause tight production cycle; the final group weld is not in the center of the entire vertical plate, and the welding deformation during welding is not easy to control; it is also necessary to introduce new welding equipment and heat treatment equipment to meet the welding of the final group weld and deformation requirements

Method used

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  • Vertical symmetrical welding method for wide and thick plates
  • Vertical symmetrical welding method for wide and thick plates
  • Vertical symmetrical welding method for wide and thick plates

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Experimental program
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Effect test

Embodiment

[0024] Use the above four steps of a, b, c, and d to weld the vertical plate. When proceeding to step d, use the parameters in the following table for welding. After the welding is completed, carry out flatness inspection and UT flaw detection to obtain the following The above test results:

[0025]

[0026]

[0027] In the 7 embodiments in the above table, it can be seen that when the mass percentage content of argon is 80%, the mass percentage content of carbon dioxide is 20%, the groove width is 18mm≤H1≤22mm, and the fillet at the root of the groove is When R=4mm, the size of the blunt edge of the groove is 2.5mm≤H2≤2.6mm, and the angle α of the blunt edge of the groove is 35°, the quality of the welded joint of the vertical plate is good, and the non-destructive testing is qualified, and the flatness can be well controlled at 0.2 mm; and when the width of the groove, the fillet R of the root of the groove, the size of the blunt edge of the groove, and the angle α of ...

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Abstract

The invention discloses a vertical symmetrical welding method for wide and thick plates. The method is capable of guaranteeing planeness of vertical plates not more than 0.2mm, and includes the steps of a, welding to form a left cutter head, a middle plate and a right cutter head; b, heat treatment; c, finish machining; and d, welding of the left cutter head, the middle plate and the right cutter head by means of vertical up symmetric gas metal arc welding. For the vertical up symmetric gas metal arc welding, argon added with carbon dioxide is used as protective gas, wherein mass content of the argon is 80%, and mass content of the carbon dioxide is 20%; and a first composite weld and a second composite weld are identical in groove dimension, wherein groove width satisfies 18mm< / =H1< / =22mm, groove root fillet R=4mm, groove root face dimension satisfies 2.5mm< / =H2< / =2.6mm, and groove root face angle alpha=35 degrees. Planeness can be controlled within 0.2mm strictly, and flaw detection of welded joints is guaranteed to be qualified.

Description

technical field [0001] The invention relates to a welding process, in particular to a vertically symmetrical welding method for wide and thick plates. Background technique [0002] At present, in the 800MN die forging press, the vertical plate is one of its important components. Each vertical plate is composed of 9 steel plates that are tailor-welded, and multiple vertical plates are assembled together to form the supporting structure of the whole set of equipment. The total length of the vertical slab is nearly 36m, the maximum thickness is 350mm, and the material strength is very high. Due to the ultra-long and ultra-thick plates, the process requires tailor-welded forming, and the requirements for welding quality and deformation control are strict (the flatness of the entire workpiece after welding and forming cannot exceed 0.2mm). Therefore, a reasonable welding process must be adopted to ensure the high-precision control requirements of the vertical plate. After the i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/173B23K9/02B23K25/00
Inventor 王迎君刘志颖田洪波李振国张继亮
Owner CHINA ERZHONG GRP DEYANG HEAVY IND
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