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A terminal crack prevention process for q420 high-strength steel flux-copper liner submerged arc welding

A high-strength steel and copper liner technology, applied in arc welding equipment, welding/welding/cutting items, manufacturing tools, etc., can solve problems such as increased welding workload, inability to penetrate, and prevent the occurrence of terminal cracks, The effect of reducing rotational deformation and reducing the occurrence rate of terminal cracks

Active Publication Date: 2021-04-27
广州黄船海洋工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current solution usually adopts the terminal ladder restraint weld method to force the terminal to avoid deformation of the terminal during the welding process. Although the terminal crack can be avoided, the position of the restrained weld is usually not penetrated, and the back of the terminal needs to be repaired after welding. , increase welding workload

Method used

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  • A terminal crack prevention process for q420 high-strength steel flux-copper liner submerged arc welding
  • A terminal crack prevention process for q420 high-strength steel flux-copper liner submerged arc welding
  • A terminal crack prevention process for q420 high-strength steel flux-copper liner submerged arc welding

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Comparison scheme
Effect test

Embodiment 1

[0031] This embodiment discloses a terminal crack prevention process of Q420 high-strength steel flux-copper-lined submerged arc welding, which is mainly applied to Q420 high-strength steel with a thickness of 10mm≤t<17mm, including the following steps:

[0032] Step 1, process the Y-shaped welding groove at the welding place of the steel plate, see for details figure 1 , where the opening angle of the Y-shaped welding groove is 57°-63°, the blunt edge is 2-4mm, and the root gap is 0-1mm; after the Y-shaped welding groove is processed, the Y-shaped welding groove surface and the Y-shaped welding Clean up the oxide layer and impurities within 20mm around the groove;

[0033] In the present invention, the setting of the groove parameters is mainly related to the welding heat input and the welding seam forming effect. According to the plate thickness in this embodiment, the groove parameters are correctly matched, and the welding heat input and the welding seam forming effect ar...

Embodiment 2

[0056] This embodiment discloses a terminal crack prevention process of Q420 high-strength steel flux-copper-lined submerged arc welding, which is mainly applied to Q420 high-strength steel with a thickness of 17mm≤t<23mm, and specifically includes the following steps:

[0057] Step 1, step 1, process Y-shaped welding grooves at the welding place of the steel plate, see for details figure 1 , where the opening angle of the Y-shaped welding groove is 47°-53°, the blunt edge is 2-4mm, and the root gap is 0-1mm; after the Y-shaped welding groove is processed, the Y-shaped welding groove surface and the Y-shaped welding Clean up the oxide layer and impurities within 20mm around the groove;

[0058] Steps 2 to 8 are the same as those in Embodiment 1, and will not be repeated here.

[0059] Among them, the relationship between the design idea of ​​the opening angle, the size of the blunt edge and the thickness of the Q420 high-strength steel, please refer to the description in Embo...

Embodiment 3

[0061] This embodiment discloses a terminal crack prevention process of Q420 high-strength steel flux-copper-lined submerged arc welding, which is mainly applied to Q420 high-strength steel with a thickness of 23mm≤t<31mm, and specifically includes the following steps:

[0062] Step 1, step 1, process Y-shaped welding grooves at the welding place of the steel plate, see for details figure 1 , where the opening angle of the Y-shaped welding groove is 42°-48°, the blunt edge is 4-6mm, and the root gap is 0-1mm; after the Y-shaped welding groove is processed, the Y-shaped welding groove surface and the Y-shaped welding Clean up the oxide layer and impurities within 20mm around the groove;

[0063] Steps 2 to 8 are the same as those in Embodiment 1, and will not be repeated here.

[0064] Among them, the relationship between the design idea of ​​the opening angle, the size of the blunt edge and the thickness of the Q420 high-strength steel, please refer to the description in Embo...

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Abstract

The present invention proposes a terminal crack prevention process of Q420 high-strength steel flux-copper-lined submerged arc welding, comprising the following steps: processing a Y-shaped welding groove at the welding place of the steel plate, and after processing, Y-shaped welding groove surface and Clean the oxide layer and impurities within 20mm around the Y-shaped welding groove; assemble the groove of the steel plate to be welded and perform positioning welding; prepare the arc starting plate and arc extinguishing plate; install the arc starting plate and arc extinguishing plate on Both ends of the welding groove; carry out bottom welding on the beginning of the Y-shaped welding groove 200-250mm, and the end of the Y-shaped welding groove 450-500mm; select welding materials that meet the requirements and implement FCB submerged arc welding; heat the trapezoidal area of ​​​​the terminal and Carry out welding; after the welding is completed and the weld seam cools down, remove the arc striker and arc extinguishing plates at both ends of the weld seam. The invention can effectively prevent the terminal welding crack problem of Q420 high-strength steel flux copper lining method submerged arc welding, and reduce the workload of repairing the weld terminal crack after welding.

Description

technical field [0001] The invention relates to a high-strength steel thick plate welding process, in particular to a terminal crack prevention process for Q420 high-strength steel flux-copper liner submerged arc welding. Background technique [0002] With the improvement of technical indicators and service life requirements of bridges, tunnels and other buildings, their load-bearing reinforced concrete structures have been gradually replaced by high-strength structural steel design structures, and the steel materials used in design are also developing in the direction of high strength and large thickness. . Q420 is a low-alloy high-strength structural steel with a yield strength level greater than or equal to 420MPa. It has been used in steel box girder structures and truss structures in bridge buildings, and steel shell structures in tunnel buildings. [0003] Flux copper backing submerged arc welding, referred to as FCB submerged arc welding, is a submerged arc welding t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/18B23K9/16B23K9/235B23K33/00B23K103/04B23K101/18
CPCB23K9/16B23K9/18B23K9/235B23K33/004B23K2101/185B23K2103/04
Inventor 张继军雷炳育邵丹丹陈立群潘庆亮杨楚文吴伟平张岩
Owner 广州黄船海洋工程有限公司
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