Welding method for bottom plate of large stainless steel tank under high-temperature environment

Abstract

The invention discloses a welding method for a bottom plate of a large stainless steel tank under a high-temperature environment. The welding method is characterized by comprising the following stepsthat a, center plates are welded, short weld joints are welded firstly, then long weld joints are welded, and initial layer welding is conducted through a subsection welding, subsection reversing welding or skip welding method; b, edge plates are welded; c, fillet welding joints of wall plates and the bottom plate are welded; and d, contraction joints are welded, wherein the steps are set according to the welding sequence. The welding method for the bottom plate of the large stainless steel tank under the high-temperature environment has the characteristic that under the high-temperature, high-humidity and blown sand environment, the stress releasing time of bottom plate welding is longer than that of usual bottom plate welding, welding technical measures are rigorous in design and high inoperability, welding stress releasing after welding construction of the bottom plate of the tank is completed is successfully buffered, welding deformation caused after releasing is avoided, the welding quality of the bottom plate of the tank is good, and the welding method smoothly passes the inspection standard that the ASME standard and the SABIC standard are mutually combined and complemented, wins owner praises and accumulates the relevant manufacturing experience of the petrochemical tank.

Description

technical field [0001] The invention relates to a welding method for the bottom plate of a steel tank tank, in particular to a welding method for the bottom plate of a large stainless steel tank tank under a high-temperature environment. Background technique [0002] Chinese patent CN102069307 B disclosed a method for welding the bottom plate of a large flat-bottomed storage tank on August 1, 2012, which includes the following steps: (1) prefabricating several medium-width plates, and laying several medium-width plates for flat butt joint or lapping After joining, the bottom plate of the circular flat-bottomed storage tank is formed, and the bottom plate seams between the adjacent middle plates are dislocated, and then the adjacent middle plates are spot welded and fixed; (2) Prefabricated several fan-shaped edge steel plates, and then The fan-shaped edge steel plate is tiled along the outer circle of the bottom plate of the flat-bottomed storage tank to form an annular edge...

AI Technical Summary

Problems solved by technology

However, this tank bottom installation method produces unevenness on the bottom plate of the tank, which affects the quality of the tank

[0004] According to "Control of Local Concave-Convex Out-of-Tolerance of Large Tank Bottom" (see Journal of Guangxi Institute of Technology, Qin Yaobang, Volume 14, Issue 4, December 2003), a tank bottom with an inner diameter of 14m and a height of 27m is disclosed. -32m vertical tank, although the plates with larger length and width are used, and the welding seams are symmetrically arranged around the center of the bottom plate, so that the welding heat is evenly distributed, but there is still a concave-convex deformation of the bottom plate after welding of 32-45mm

[0005] Therefore there is above-mentioned inconvenience and problem in known large-scale tank bottom plate welding method

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