Method of electric arc surfacing with gas protection consisting of an argon/helium gas mixture

Patent metadata

Field	Value
Publication number	US-2016288238-A1
Application number	US-201415034768-A
Country	US
Kind code	A1
Filing date	Nov 4, 2014
Priority date	Nov 7, 2013
Publication date	Oct 6, 2016
Grant date	—

Abstract

The invention relates to a process for cladding at least one portion of a metal part, the process implementing a non-consumable electrode, a consumable metal filler wire, and an electric arc drawn between the electrode and the part so as to produce a molten metal puddle, the end of the metal filler wire being melted by the electric arc so as to achieve a transfer of molten metal from the filler wire to the molten metal puddle and to coat at least one portion of the part with a metal deposit. According to the invention, the process uses a shielding gas to shield the electrode, the filler wire and the puddle, with a gas mixture containing 20 to 70% helium, and argon for the rest (% by volume).

First claim

1 - 10 . (canceled)

11 : A process for cladding at least one portion of a metal part, said process comprising a non-consumable electrode, a consumable metal filler wire, and an electric arc drawn between the electrode and the part thereby producing a molten metal pool, the end of the metal filler wire being melted by the electric arc so as to achieve a transfer of molten metal from the filler wire to the molten metal pool and to coat at least one portion of the part with a metal deposit, wherein a shielding gas is used to shield the electrode, the filler wire and the pool, with a gas mixture consisting of 20 to 70% helium, and argon for the rest (% by volume).

12 : The process of claim 11 , wherein said gas mixture contains at most 50% helium (% by volume).

13 : The process of claim 11 , wherein said gas mixture contains at most 30% helium (% by volume).

14 : The process as of claim 11 , wherein the transfer of molten metal to the molten metal pool is achieved via a liquid bridge so as to have a permanent contact between said pool and the molten end of the filler wire.

15 : The process of claim 11 , wherein the end of the filler wire is guided to make an angle comprised between 5 and 50° to the axis of the electrode.

16 : The process of claim 11 , wherein the end of the filler wire is guided and permanently maintained at a distance (D) smaller than 2 mm from the end of the electrode.

17 : The process of claim 11 , wherein the end of the filler wire is guided so as to make an angle comprised between 10 and 25° to the axis of the electrode.

18 : The process of claim 11 , wherein the non-consumable electrode is made of tungsten.

19 : The process of claim 11 , wherein the part to be clad and/or the metal deposit deposited on said part is made of carbon steel, stainless steel, a nickel-based alloy or a cobalt-based alloy.

20 : The process of claim 11 , wherein the metal deposit has a thickness comprised between 1 and 20 mm.

Assignees

• L'Air Liquide Société Anonyme pour l'Etude et l'Exploitation des Procédés Georges Claude

Inventors

• Planckaert Jean-Pierre

Classifications

• B23K35/383

  mainly containing noble gases or nitrogen · CPC title

• B23K35/38

  Selection of media, e.g. special atmospheres for surrounding the working area · CPC title

• B23K9/173

  and of a consumable electrode · CPC title

• B23K9/124

  Circuits or methods for feeding welding wire · CPC title

• B23K9/167 Primary

  and of a non-consumable electrode · CPC title