Vertical symmetrical welding method for wide and thick plates

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...

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

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