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Method for welding Q420 steel for power grid iron tower

A welding method and iron tower technology, applied in the field of steel welding, can solve the problems of inability to meet the high-quality and high-efficiency requirements of power grid iron towers, difficult welding joint test parameters, uneven welding quality, etc. Easy-to-operate effects

Active Publication Date: 2010-12-15
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, at present, there is no special research on it. Each production and construction unit adopts conventional welding methods according to their own personnel, equipment and other conditions. The welding process is very random, not only time-consuming, labor-intensive, energy-consuming The welding quality is uneven, and the test parameters of the welded joints are difficult to meet the relevant national standards, and cannot meet the high-quality and high-efficiency requirements of the production and construction of power grid iron towers.

Method used

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  • Method for welding Q420 steel for power grid iron tower
  • Method for welding Q420 steel for power grid iron tower
  • Method for welding Q420 steel for power grid iron tower

Examples

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Embodiment 1

[0028] A welding method for Q420 steel for power grid iron towers, used for welding Q420 steel plates with a thickness of 12mm or 16mm, and suitable for welding in the form of butt joints. 2 NBC-350 welding machine with Ar welding power source, welding consumables use Atlantic brand J557ф3.2 welding rod or Atlantic brand J557ф4.0 welding rod, or Atlantic brand ER55-G welding wire, using 80% Ar+20% CO 2 The semi-automatic solid wire mixed gas shielded welding process welds at room temperature without preheating, see the attached figure 1 , the butt joint adopts an asymmetric K-shaped groove, the groove angles on both sides are 45-50° and 58-62° respectively, the width of the blunt side of the groove is 0-2.5mm, the gap between the welding counterparts is 0-4mm, and the welding process adopts flat Three spatial positions of welding, vertical welding and horizontal welding, welding speed = 12-29cm / min, heat input = 123-296kj / min.

Embodiment 2

[0030] A welding method for Q420 steel for power grid iron towers, which is used for welding Q420 steel plates with a thickness of 12mm or 16mm, and is suitable for welding in the form of T-shaped joints with full penetration. 2 NBC-350 welding machine with Ar welding power source, welding consumables use Atlantic brand J557ф3.2 welding rod or Atlantic brand J557ф4.0 welding rod, or Atlantic brand ER55-G welding wire, using 80% Ar+20% CO 2 The semi-automatic solid wire mixed gas shielded welding process is welded at 0°C, and the Q420 steel is preheated to 150°C before welding. figure 2 , the T-shaped joint with gold penetration adopts an asymmetric K-shaped groove, the angles of the grooves on both sides are 45-50° and 58-62° respectively, the width of the blunt edge of the groove is 0-3mm, and the gap between the welding counterparts is 0-3mm. The welding process adopts three spatial positions of flat welding, vertical welding and horizontal welding, welding speed = 16-44cm / ...

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Abstract

The invention discloses a method for welding Q420 steel for a power grid iron tower, which is used for welding Q420 steel plates with the thickness of 12mm or 16mm and is suitable for two joint forms of a butt joint and a full penetration weld T-shaped joint. The process comprises the following steps of: welding by adopting a mixed gas arc welding process of 80% Ar plus 20% CO2 semiautomatic solidwire; by adopting a multi-layer welding method, welding a first layer in a horizontal welding position and welding other layers in a downward welding position after the back chipping, wherein the butt joint uses asymmetric K-shaped grooves, and groove angles at both sides of the butt joint are 45-50 degrees and 58-62 degrees respectively, the width of truncated edge of the groove is 0-3mm ,and the welding interface-gap is 0-3mm. In the invention, the welding process is optimally designed by aiming at the peculiarity of the Q420 steel for the power grid iron tower. The whole process saves time, labor and energy, and various test parameters of the welding joints all exceed national standards, thereby providing the technical support for the power grid iron tower production and construction.

Description

technical field [0001] The invention relates to a steel welding method, in particular to a Q420 steel welding method suitable for both workshop production and construction site operations. Background technique [0002] At present, with the rapid development and construction of my country's power grid, new high-strength structural steel represented by Q420 steel is widely used in the production and construction of power grid iron towers. Specifically, Q420 steel is mainly used in the production of steel tower structural parts in the production of power grid iron towers. Therefore, the welding operation of Q420 steel has become an important link in the production and construction of power grid iron towers. However, at present, there is no special research on it. Each production and construction unit adopts conventional welding methods according to their own personnel, equipment and other conditions. The welding process is very random, not only time-consuming, labor-intensive, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/16B23K9/32B23K9/095B23K33/00
Inventor 王宝才王志伟王迎军焦荣格何生贵孙芳苏马郝彦琴
Owner STATE GRID CORP OF CHINA
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