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Welding method and application of maritime work high-strength steel plates

A technology of high-strength steel plates and welding methods, applied in welding equipment, welding/welding/cutting items, manufacturing tools, etc., can solve problems such as uneconomical, low impact absorption energy of welds, and difficulty in meeting the requirements of classification societies , to achieve the effect of reducing thermal energy consumption, high economy, and reducing welding workload

Inactive Publication Date: 2015-10-07
武汉铁锚焊接材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Although the heat treatment at 350°C can ensure the impact toughness of the weld, it takes a very long time to eliminate the residual stress, which is not economical; while the heat treatment at a temperature above 550°C can eliminate the stress in a short time, but the welding with ordinary welding materials Seam impact absorption energy is low, it is difficult to meet the requirements of classification societies

Method used

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  • Welding method and application of maritime work high-strength steel plates
  • Welding method and application of maritime work high-strength steel plates

Examples

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Effect test

Embodiment 1

[0029] 50mm thickness Q500E horizontal butt welding, specific process and implementation steps:

[0030] ① Welding materials

[0031] Flux cored wire YCJ551K2, specification Φ1.2; CO 2 Gas, purity 99.95%; welding parameters: current 220~230A, voltage 26~27V, welding speed 36~42cm / min.

[0032] ② Groove form

[0033] Take an asymmetrical X-groove (such as figure 1 As shown), the groove angle is 45° on the T1 side and 40° on the T2 side, leaving a gap of 2mm at the root of the groove, and the thickness of both sides is 22mm on the T1 side and 28mm on the T2 side.

[0034] ③The implementation steps are:

[0035] First, arrange far-infrared heating devices on both sides of the steel plate, preheat to 100 ° C ~ 150 ° C within 500 mm from the groove, and use thermal insulation blankets to prevent heat dissipation.

[0036] Secondly, on the deep side of the groove (T2 side), use YCJ551K2 flux-cored wire for back welding of 3~4 layers, the welding thickness is about 14mm, and the...

Embodiment 2

[0060] 60mm thickness Q500E horizontal T-joint welding, specific process and implementation steps:

[0061] ① Welding material

[0062] Flux cored wire YCJ551K2, specification Φ1.2; CO 2Gas, purity 99.95%; welding parameters: current 220~230A, voltage 26~27V, welding speed 36~42cm / min.

[0063] ② Groove form

[0064] Take an asymmetrical K-groove (such as figure 2 As shown), the groove angle is 40° on the T1 side and 40° on the T2 side, leaving a gap of 2mm at the root of the groove, and the thickness of both sides is 27mm on the T1 side and 33mm on the T2 side.

[0065] ③The implementation steps are:

[0066] First, arrange far-infrared heating devices on both sides of the steel plate, preheat to 100 ° C ~ 150 ° C within 500 mm from the groove, and use thermal insulation blankets to prevent heat dissipation.

[0067] Secondly, on the deep side of the groove (T2 side), use YCJ551K2 flux-cored wire for back welding of 3~4 layers, the welding thickness is about 14mm, and t...

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Abstract

The invention discloses a welding method of maritime work high-strength steel plates. An asymmetric X-shaped or K-shaped groove is formed in the welded position. A gap of 2+ / -1 mm is reserved in the root portion of the groove. When the asymmetric X-shaped groove is adopted, the angle of the groove is 40+ / -5 degrees, and CO2 protects multi-layer and multi-pass welding of flux-cored wires. When the K-shaped groove is adopted, the angle of the groove is 45+ / -5 degrees, and CO2 protects multi-layer and multi-pass welding of flux-cored wires. Besides, the welding thickness on the two sides is set in the mode that the plate thickness is D mm, the distances between the section, parallel to the plane of each steel plate, of the root portion of the groove and the two planes of the steel plate are T1 and T2, the groove portion on the T1 side is shallow, the groove portion on the T2 side is deep, T1 is smaller than T2, T1 is equal to 1 / 2D-3 mm, and T2 is equal to 1 / 2D+3mm. By the adoption of the welding method, the welding workload can be lightened, heat energy dissipation is reduced, unexpected welding deformation and welding cracks of welded components are avoided, the welding stress is rapidly eliminated, and a welded structure meets expected requirements.

Description

technical field [0001] The invention relates to a welding process of high-strength and ultra-high-strength thick steel plates in the manufacture of marine engineering structures, in particular to a welding method and application of high-strength steel plates for marine engineering. Background technique [0002] In marine engineering and shipbuilding, high-strength and even ultra-high-strength steel plates, such as Q500E, are increasingly used. Due to the increasing size of marine engineering structures and ships, the thickness of steel plates used in some key components exceeds 25mm, and these key components or parts are in a state of relatively high stress level. In order to eliminate the internal stress generated during the welding process of high-strength steel thick plates, post-weld heat treatment is usually required. The problem is that in the welding of ultra-high-strength steel in the prior art, due to the constraints of the welding process, in order to ensure low-t...

Claims

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Application Information

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IPC IPC(8): B23K9/02B23K9/235B23K33/00B23K31/12B23K9/16
CPCB23K9/0026B23K9/0216B23K9/16B23K9/235B23K31/003B23K31/125B23K33/004B23K2101/18B23K2103/04
Inventor 吴光辉吕奎清肖庆华张少健
Owner 武汉铁锚焊接材料股份有限公司
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