Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for arc welding with a dual gas flow, with a central flow containing argon and hydrogen, and with a sheath flow including argon and either carbon dioxide or oxygen

A gas flow and argon gas technology, applied in arc welding equipment, welding/welding/cutting items, welding media, etc., can solve problems such as impossible industrialization

Inactive Publication Date: 2012-01-11
LAIR LIQUIDE SA POUR LETUDE & LEXPLOITATION DES PROCEDES GEORGES CLAUDE
View PDF6 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0028] This makes industrialization of the method impossible, as it is practically impossible to control the oxygen content of the gas used in terms of the total amount delivered to the bath in free form

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
  • Method for arc welding with a dual gas flow, with a central flow containing argon and hydrogen, and with a sheath flow including argon and either carbon dioxide or oxygen
  • Method for arc welding with a dual gas flow, with a central flow containing argon and hydrogen, and with a sheath flow including argon and either carbon dioxide or oxygen
  • Method for arc welding with a dual gas flow, with a central flow containing argon and hydrogen, and with a sheath flow including argon and either carbon dioxide or oxygen

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0046] In the context of the present invention, metal flow and weld bead formation have been studied in the presence of several different gases or gas mixtures in automatic dual-flow TIG welding in order to solve the "hump" problem.

[0047] In particular, tested by Ar / H 2 The central gas flow formed by the mixture and the Ar / CO 2 The annular air flow formed by the mixture is used to increase the welding speed. This combination has been carefully chosen to benefit from the properties of each component to achieve the desired effect.

[0048] Thus, argon helps to ignite and stabilize the arc due to its low ionization energy of only 15.8 eV compared to the 24.6 eV required for helium.

[0049] Hydrogen is added to increase the energy of the arc. Because H 2 is a diatomic molecule whose presence in the gas mixture will increase the heat supply applied to the steel plate due to the energy released during recombination (4.5eV per molecule). In addition, the higher thermal condu...

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
diameteraaaaaaaaaa
Login to View More

Abstract

The invention relates to an arc welding method that implements an arc welding torch provided with an electrode, in which a central gas flow is supplied so as to contact the electrode and an annular gas flow is supplied on the periphery of said first gas flow. The central gas flow contains only argon and hydrogen (H2), the hydrogen content being 2 to 8 vol percentage. The sheath gas flow only contains argon and 1.8 to 3 vol percentage of carbon dioxide (CO2) or 0.9 to 1.5 vol percentage of oxygen (O2). The method is used for welding parts made of steel, in particular stainless steel or carbon steel, as well as steel coated with zinc or aluminium or any other material for preventing the corrosion of said steel.

Description

technical field [0001] The invention relates to a method of performing electric arc welding using an arc welding torch having an electrode and a dual gas flow having a composition enabling the phenomenon of "humping" to be prevented or at least minimized. Background technique [0002] B.J.Bradstreet's "Effect of surface tension and metal flow on weld bead formation" ("Effect of surface tension and metal flow on weld bead formation", Welding Journal, 1968, Vol. 47, No. 7, p. 314-322) mentioned The phenomenon called "humping" in MIG welding, and "Theoretical approach to the humping phenomenon in welding processes" by U.Gratzke et al. ", J.Phys.D.Appl.Phys., 1992, Volume 25, Pages 1640-1647) demonstrates that in tungsten inert gas shielded welding (TIG welding), submerged arc welding, laser welding and electron beam The existence of this phenomenon in welding. [0003] A weld with a "hump" appears to have an irregular shape at first glance. However, detailed observations rev...

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): B23K9/167B23K35/38
CPCB23K2201/185B23K35/222B23K2203/04B23K35/383B23K9/167B23K2101/185B23K2103/04B23K2103/05
Inventor S・加德雷J-P・普朗卡尔特
Owner LAIR LIQUIDE SA POUR LETUDE & LEXPLOITATION DES PROCEDES GEORGES CLAUDE
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

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

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com