Welding joint and welding method of marine crack arrest steel

A welding method and crack arresting technology, applied in welding equipment, welding accessories, arc welding equipment, etc., can solve problems such as low production efficiency, increased welding time, and difficulty in removing slag shells, and achieve improved production efficiency and high impact toughness Reserve, achieve the effect of welding quality and efficiency

Pending Publication Date: 2021-12-21
ZHANGJIAGANG RONGSHENG SPECIAL STEEL CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Therefore, in the prior art, when welding the EH47BCA steel plate, on the basis of ensuring the crack arrest performance and mechanical properties of the welded joint, it is difficult to remove the slag shell in the weld, and the slag removal leads to increased welding time and low production efficiency. The technical problem to be solved by the present invention is to overcome the problem that the existing technology is difficult to have both the high performance of the welded joint and the high efficiency of the welding process, thereby providing a welded joint and welding method for ship crack arrest steel

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  • Welding joint and welding method of marine crack arrest steel
  • Welding joint and welding method of marine crack arrest steel
  • Welding joint and welding method of marine crack arrest steel

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Embodiment 1

[0034] This embodiment provides a welding method for marine crack arresting steel, comprising the following steps,

[0035] (1) Use 60mm thick EH47BCA1 boxed marine crack arrest steel, the supply status is TMCP, and the crack arrest toughness at -10°C is Kca≥6000N / mm 3 / 2 ;The welding groove is X-shaped groove, the groove angle is 60±5°, equal thickness butt joint, and the test plate size is 1000mm×400mm×60mm;

[0036](2) The flux-cored welding wire used in flux-cored gas-shielded welding (FCAW) is A5.29 E81T1-K2C, and has passed the classification society 5Y46 H5 certification, and the diameter of the welding wire is 1.2mm; The combination of arc welding wire and flux meets ENISO 26304-A:S69 4FB TZ H5, and has passed the classification society 5Y46 certification. The diameter of the first welding wire and the second welding wire is 2.0mm, and the diameter of the third welding wire is 4.0mm;

[0037] Preheat to 70°C before welding, and the interpass temperature is 70-180°C. Th...

Embodiment 2

[0039] This embodiment provides a welding method for marine crack arresting steel, comprising the following steps,

[0040] (1) Use 80mm thick EH47BCA1 boxed marine crack arrest steel, the supply status is TMCP, and the crack arrest toughness Kca at -10°C is ≥ 8000N / mm 3 / 2 ;The welding groove is X-shaped groove, the groove angle is 55±5°, equal thickness butt joint, and the test plate size is 1000mm×400mm×80mm;

[0041] (2) The flux-cored welding wire used by FCAW is A5.29 E81T1-K2C, and has passed the classification society 5Y46 H5 certification, and the diameter of the welding wire is 1.2mm; the submerged arc welding wire and flux combination used by dual-power three-wire submerged arc welding meet EN ISO 26304-A: S69 4FBTZ H5, and certified by classification society 5Y46, the diameter of the first welding wire and the second welding wire is 2.0mm, and the diameter of the third welding wire is 4.0mm;

[0042] Preheat to 70°C before welding, and the interpass temperature is ...

Embodiment 3

[0044] This embodiment provides a welding method for marine crack arresting steel, comprising the following steps,

[0045] (1) Use 100mm thick EH47BCA1 boxed marine crack arrest steel, the supply status is TMCP, and the crack arrest toughness at -10°C is Kca≥8000N / mm 3 / 2 ;The welding groove is X-shaped groove, the groove angle is 55±5°, equal thickness butt joint, and the test plate size is 1000mm×400mm×100mm;

[0046] (2) The flux-cored welding wire used by FCAW is A5.29 E81T1-K2C, and has passed the classification society 5Y46 H5 certification, and the diameter of the welding wire is 1.2mm; the submerged arc welding wire and flux combination used by dual-power three-wire submerged arc welding meet EN ISO 26304-A: S69 4FBTZ H5, and certified by classification society 5Y46, the diameter of the first welding wire and the second welding wire is 2.0mm, and the diameter of the third welding wire is 4.0mm;

[0047] Preheat to 85°C before welding, and the interpass temperature is ...

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Abstract

The invention belongs to the technical field of steel and iron material welding, and particularly relates to a welding joint and a welding method of marine crack arrest steel. The method is suitable for marine EH47BCA-grade crack arrest steel serving as a base material, a root welding seam in a welding groove is continuously welded through flux-cored wire gas shielded welding till the width of the welding seam in the groove is not less than 22 millimeters, and then double-power-source three-wire submerged arc welding is adopted for welding till the welding seam is filled, the heat input of flux-cored wire gas shielded welding is 9-22 kJ / cm, and the heat input of the dual-power three-wire submerged arc welding is 45-64 kJ / cm. According to the welding joint and welding method, the flux-cored wire gas shielded welding and the dual-power three-wire submerged arc welding are combined, the problem that slag is difficult to remove is solved on the basis that the obtained welding joint is excellent in mechanical property and good in low-temperature crack arrest performance, the production efficiency is improved, and the method has the advantages of being excellent in mechanical property of the welding joint and high in production efficiency at the same time.

Description

technical field [0001] The invention belongs to the technical field of iron and steel material welding, and in particular relates to a welding joint and welding method of ship crack arresting steel. Background technique [0002] In order to pursue higher shipping efficiency, container carriers are rapidly developing towards large and super-large container ships. The "economy of scale effect" produced by the large-scale container ships of 18,000-24,000 TEU invested in batches will make the container ship market in the future. Still thriving. The development trend of super-large container ships puts forward more and higher requirements for hull structure design and materials. In order to ensure the safety and reliability of the structure of ultra-large container ships, it is required to use EH47BCA steel plates with crack arrest performance in the welding parts of key areas such as hatch coamings and decks that are subject to complex alternating stresses such as heavy loads a...

Claims

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Application Information

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IPC IPC(8): B23K9/16B23K9/18B23K9/32
CPCB23K9/16B23K9/18B23K9/32
Inventor 李丽田猛韩丽梅曲锦波
Owner ZHANGJIAGANG RONGSHENG SPECIAL STEEL CO LTD
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