Welding construction method for bottom plate of large storage tank

Abstract

The invention relates to a welding construction method for a bottom plate of a large storage tank. The welding construction method comprises the following steps: 1) jointing an outer ring of the bottom plate by adopting edge plates, and jointing an inner ring of the bottom plate by adopting middle center plates; 2) firstly carrying out spot welding on the edge plates; 3) carrying out spot welding on the middle center plates; 4) welding fillet welding seams of the edge plates and a tank wall plate from outside to inside by adopting a method of firstly welding intermittently and then carrying out full-length welding; 5) welding the rest length of the edge plates; 6) welding fixed welding seams of the middle center plates and the edge plates by adopting the method of firstly welding intermittently and then carrying out full-length welding, wherein each T-shaped welding seam at least completes welding seam length of 100mm; 7) jointing the middle center plates to complete intermittent welding and full-length welding sequentially, wherein a joint of each jointed plate welding seam and a joint welding seam at least completes welding length of 100mm, and then completes full-length welding; and 8) reducing residual stress and deformation of welding seams by adopting a hammering method. The welding construction method can effectively prevent bottom plate deformation caused by direct full-length welding, so that flatness of the welded bottom plate is improved by more than 30% in comparison with that in a normal welding method, and integral forming and welding quality of the bottom plate is improved, and therefore, a service life of the storage tank is guaranteed.

Description

technical field [0001] The invention relates to the technical field of equipment welding, in particular to a large-scale storage tank bottom plate welding construction method. Background technique [0002] For large storage tanks, the welding quality of the bottom plate will directly affect the service life of the storage tank and the safety of production. The traditional welding method is that each weld seam is fully welded in a preset order, and welded according to the set order. Although part of the welding residual stress can be released, the bottom plate will still be deformed in actual construction, and most of the residual stress will still remain around the weld. Contents of the invention [0003] The invention provides a welding construction method for the bottom plate of a large storage tank. In addition to the method of sequential welding, the method of intermittent welding and then full welding is also used for welding, which can effectively prevent the deforma...

AI Technical Summary

Problems solved by technology

[0002] For large storage tanks, the welding quality of the bottom plate will directly affect the service life of the storage tank and the safety of production. The traditional welding method is that each weld seam is fully welded in a preset order, and welded according to the set order. Although part of the welding residual stress can be released, the actual construction will still cause deformation of the bottom plate, and most of the residual stress will still remain around the weld

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