Method for preventing welding deformation of tube plate structure

Abstract

The invention discloses a method for preventing welding deformation of a tube plate structure, and relates to the field of welding of large tube plate structures, a new process combining pre-deformation, temporary tie bar rigid fixation, welding sequence optimization and the like is adopted, and the control method comprises the following steps: assembling and splicing points in sequence; pre-deformation is conducted; welding a temporary tie bar; welding the marked mounting position welding seam of the outer rib plate; backing welding is conducted on an inner side annular groove welding seam; welding outer rib plate welding seams; filling cosmetic welding inner side circumferential welds; dismantling the temporary tie bars; welding an outer side circumferential weld; and drilling the bottom plate and the like to complete the integral welding and processing of the cylinder assembly. By means of the method, the welding deformation degree of the tower bottom plate is obviously reduced, the technical requirement can be met only through single-time heating shape correction without adding machining procedures, and the manufacturing cost is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of welding control of tube-sheet structures, and in particular relates to a method for preventing welding deformation of tube-sheet structures. Background technique [0002] In cargo ships, farms, garbage transfer stations and other places, the grabber is used to grab and move the material, and the tower is used as the fixed base of the grabber. The flatness of the bottom plate of the tower directly affects the stability of the equipment operation, and usually requires higher flatness. In the tower components, the groove fillet weld between the bottom plate of the tower and the cylinder and the fillet weld on both sides of the outer rib plate will lead to aggravated welding deformation and poor flatness of the bottom plate; [0003] In response to this problem, there are usually two methods: First, set the process allowance for the thickness of the bottom plate. After the welding is completed, machine and m...

AI Technical Summary

Problems solved by technology

In the tower components, the groove fillet welds between the bottom plate of the tower and the cylinder, and the fillet welds on both sides of the outer ribs will cause the welding deformation of the bottom plate to increase and the flatness to deteriorate;

[0003] To solve this problem, there are usually two methods: one is to set the process allowance for the thickness of the bottom plate. After the welding is completed, the raised area on the back of the bottom plate is machined and milled until the flatness of the entire back side meets the requirements of the design drawings. The biggest disadvantage of this method is High requirements for machining equipment, large amount of milling, and long machining time lead to high manufacturing costs; secondly, multiple flame corrections are used to prevent excessive welding deformation during the welding process of the groove fillet weld between the cylinder and the bottom plate. Orthopedics, real-time monitoring of the flatness of the back of the bottom plate, when the flatness exceeds 8mm, suspend welding, hoist the tower to the horse’s leg, correct the flame to the flatness ±3mm, then continue welding, monitor the welding deformation of the bottom plate again, and repeat until the welding is completed, The biggest disadvantage of this method is that the manufacturing cycle is too long due to multiple flame corrections

In short, the welding deformation of the bottom plate of the tower due to the influence of welding heat leads to high manufacturing costs

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