Thick metal plate back gouging-free welding groove technology and machining process

Abstract

The invention relates to thick metal plate back gouging-free welding groove technology. The technology is characterized in that: a welding groove consists of a substrate V-shaped groove and two layers of gaskets connected to the lower surface of the substrate V-shaped groove. A welding process comprises the following steps of: before the two sides of a substrate are rolled, machining a single-sided 2 to 10-degree V-shaped groove on a facing machine, and after the two sides of the substrate are rolled and molded, forming the V-shaped groove with the bottom gap of 16 to 26 mm and the opening of4 to 20 degrees; fixing a first layer of gasket on the two sides of the groove by arc welding; fixing a second layer of gasket on the first layer of gasket by welding; welding an entire welding line according to the requirements of a welding process instruction; chopping a part of the two layers of gaskets by adopting a flame cutting method to keep the weld reinforcement of 3 to 5 mm; and grinding the weld reinforcement off by adopting a grinding wheel machine. In the technology and the welding process, the welding line is molded once, the times of preheating, dehydrogenation and flaw detection are reduced in the welding process, the manufacturing cost is saved and a manufacturing cycle is shortened.

Description

technical field [0001] The invention relates to a welding technology, in particular to a pressure vessel thick plate with liner submerged arc automatic welding without root cleaning welding groove technology. Background technique [0002] In the prior art, in the welding of thick metal plates of boilers and pressure vessels, there are roughly four types of welding grooves: 1) V-shaped groove with liner; 2) U-shaped groove; 3) double U-shaped groove ; 4) U+V groove. The disadvantage of the prior art is that no matter which one of the above four bevel forms is used, after the welding on one side is completed, before the other side is welded, it is necessary to use carbon arc gouging to clean the root, and then use a grinding wheel to clean the root. polished. If the grinding wheel is not thoroughly ground, the carburized layer produced by carbon arc gouging during the root cleaning process is likely to have adverse effects on the weld and the base metal. At the same time, i...

AI Technical Summary

Problems solved by technology

The disadvantage of the prior art is that no matter which one of the above four bevel forms is used, after the welding on one side is completed, before the other side is welded, it is necessary to use carbon arc gouging to clean the root, and then use a grinding wheel to clean the root. polished

In this way, welding a weld will not only increase the welding cost and increase the manufacturing period, but also affect the quality and performance of the weld

Images