Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Ultra high strength flux cored arc welded joint having excellent impact toughness and welding wire for manufacturing same

A technology of flux-cored wire and impact toughness, which is applied in the field of flux-cored arc welding joints and flux-cored arc welding wires. It can solve the problems of difficult to ensure arc characteristics, small diffused hydrogen, difficult to apply welding wire filling and surface, etc., and achieve excellent Impact toughness, effect of reducing diffusible hydrogen content

Inactive Publication Date: 2015-09-09
POHANG IRON & STEEL CO LTD
View PDF14 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this patent has the following problems, that is, in the welding process, the effect of reducing diffusible hydrogen based on V is small, and the total F content of alkali and alkaline earth metal fluorine compounds is 1.0 to 2.0%, which leads to Difficulty securing stable arc characteristics
[0017] Patent Document 7 discloses a technology that, based on the total weight of the welding wire, contains TiO2: 4.0 to 8.0%, alkali metal fluoride (fluorine content equivalent): 0.02 to 0.4%, and PTFE (fluorine equivalent): 0.02 to 0.4%, and adjust the fluorine equivalent value of alkaline earth metal fluorides below 0.01%, and limit the ratio of (fluorine equivalent value of alkaline earth metal fluorides + 0.35) / (PTEF fluorine equivalent value) to 1 or more , but the specific gravity of PTEF in this technology is lower than that of mineral state fluoride, so it is difficult to apply to the inner filling and surface of welding wire, and the price is relatively high, so it is difficult to realize commercialization

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
  • Ultra high strength flux cored arc welded joint having excellent impact toughness and welding wire for manufacturing same
  • Ultra high strength flux cored arc welded joint having excellent impact toughness and welding wire for manufacturing same
  • Ultra high strength flux cored arc welded joint having excellent impact toughness and welding wire for manufacturing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0140] For building steel HSA800 containing: C: 0.05%, Si: 0.13%, Mn: 2.5%, P: 0.008%, S: 0.002% and other Ni, Cr, Cu, Nb, Ti, B in weight % Steel, utilizes 1.6mm diameter wire and uses 100% CO 2 Shielding gas, flux-cored arc welding (FCAW) is implemented at a heat input of 20KJ / mm. When carrying out the FCAW, welding was performed under the conditions of current: 270 A, voltage: 28 V, welding speed: 23 cm / min, interpass temperature: 150° C. or less.

[0141] The following table 1 shows the composition results of the welded joints formed after the flux-cored arc welding, and measured the welding conditions during the welding, the microstructure and mechanical properties of the welded joints after welding, and compared them are shown in Table 2. The impact toughness among the above-mentioned mechanical properties was evaluated by Charpy impact test on the impact absorbed energy (vE) of the welded joint using KS standard (KS B 0809) impact test piece.

[0142]

[0143] Tab...

Embodiment 2

[0149] Flux-cored arc welding wires filled with flux having the composition shown in Table 3 below were manufactured.

[0150] Next, use the above welding wires to perform flux-cored arc welding under the conditions of welding current: 270-290A, voltage: 30-32V, welding speed: 25-27cm / min, and welding heat input: 18-25KJ / cm , and the composition of the welded joint formed after the above welding is shown in Table 4, and the results of evaluating the mechanical and physical properties of the welded joint, diffusible hydrogen and welding wire arc stability are shown in Table 3.

[0151] At this time, low-carbon (C)-based HSA800 steel with a tensile strength of 800 MPa or more and a low yield ratio was used as the base material for welding.

[0152] The test piece used for the tensile test was collected from the central part of the welded joint. The tensile test piece used No. 4 test piece of KS specification (KS B 0801), and the tensile test was carried out at the crosshead spee...

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
Login to View More

Abstract

The present invention relates to a flux cored arc welded joint which can be obtained by performing a flux cored arc welding on high tension steel of an ocean structure, a building, a bridge, etc. High strength and high toughness of the welded joint are obtained by controlling a composition and a microstructure of the welded joint.

Description

technical field [0001] The present invention relates to a flux cored arc welded joint which can be obtained by flux cored arc welding (FCAW) high tensile steel of offshore structures, buildings, bridges and ships etc. The welded joints are flux cored arc welding wire. Background technique [0002] In recent years, in order to secure added value, buildings and offshore structures have become larger. As long as an accident occurs in such structures, it can cause fatal losses to the environment, life, and property. Therefore, the steel materials suitable for these structures have ultra-high strength, thickness, and high impact toughness. [0003] In order to manufacture such steels reliably and efficiently, it is necessary to perform welding suitable for such steels, and as a welding method for welding such steels, the widely used welding technique is Flux cored arc welded (FCAW) technology . [0004] For a welded structure obtained by performing such welding, it is first ne...

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
Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30C22C38/08C22C38/04
CPCB23K35/3066B23K35/40C22C38/04C22C38/08B23K35/0266B23K35/3073B23K35/406B23K2103/02C22C38/42C22C38/44C22C38/48
Inventor 郑弘喆李珍羽李东烈韩一煜李洪吉
Owner POHANG IRON & STEEL CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com