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
View PDF5 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 temperat

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Welding method and application of maritime work high-strength steel plates
  • Welding method and application of maritime work high-strength steel plates

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0028] Example 1

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

[0030] ①Welding 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] ②Groove form

[0033] Take an asymmetric X-shaped 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 on 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℃~150℃ within 500mm from the groove, and use insulation blankets to prevent heat dissipation.

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

Example Embodiment

[0059] Example 2

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

[0061] ①Welding materials

[0062] 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.

[0063] ②Groove form

[0064] Take asymmetric K-shaped 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 on 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℃~150℃ within 500mm from the groove, and use insulation blankets to prevent heat dissipation.

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Tensile strengthaaaaaaaaaa
Tensile strengthaaaaaaaaaa
Hardnessaaaaaaaaaa
Login to view more

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap