Terminal crack prevention process of Q420 high-strength steel flux copper backing 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 the problems of inability to penetrate, increase welding workload, etc., to prevent the generation of terminal cracks, The effect of reducing the occurrence rate of terminal cracks and increasing the crack resistance

Active Publication Date: 2020-01-03
广州黄船海洋工程有限公司
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  • 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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  • Terminal crack prevention process of Q420 high-strength steel flux copper backing submerged-arc welding
  • Terminal crack prevention process of Q420 high-strength steel flux copper backing submerged-arc welding
  • Terminal crack prevention process of Q420 high-strength steel flux copper backing submerged-arc welding

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Effect test

Embodiment 1

[0032] 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:

[0033] 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;

[0034] 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

[0057] 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:

[0058] 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;

[0059] Steps 2 to 8 are the same as those in Embodiment 1, and will not be repeated here.

[0060] 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

[0062] 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:

[0063] 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;

[0064] Steps 2 to 8 are the same as those in Embodiment 1, and will not be repeated here.

[0065] 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 invention provides a terminal crack prevention process of Q420 high-strength steel flux copper backing (FCB) submerged-arc welding. The terminal crack prevention process comprises the following steps of processing Y-shaped welding grooves at welding portions of steel plates, and after processing is finished, cleaning away oxidation layers and impurities on the faces of the Y-shaped welding grooves and the portions within the range of 20 mm away from the peripheries of the Y-shaped welding grooves; conducting assembling and positioned welding on the to-be-welded grooves of the steel plates;preparing arc striking plates and arc quenching plates; installing each arc striking plate and each arc quenching plate at the two ends of the corresponding welding groove; conducting backing weldingon the portion 200-250 mm away from the top of each Y-shaped welding groove and on the portion 450-500 mm away from the terminal of each Y-shaped welding groove; selecting a welding material which meets the requirement for conducting FCB submerged-arc welding; heating and welding a terminal trapezoid area; after welding is finished and weld joints are cooled, cutting off the arc striking plate and the arc quenching plate at the two ends of each weld joint. By means of the terminal crack prevention process, the terminal welding crack problem of Q420 high-strength steel flux copper backing submerged-arc welding can be effectively solved, and the repair workload for post-welding weld joint terminal cracks is reduced.

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 Applications(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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