Flux-cored welding wire, the method for manufacturing the same and using of the same

Patent metadata

Field	Value
Publication number	US-9764429-B2
Application number	US-201214232104-A
Country	US
Kind code	B2
Filing date	Jul 12, 2012
Priority date	Jul 13, 2011
Publication date	Sep 19, 2017
Grant date	Sep 19, 2017

Abstract

The present invention provides a flux-cored welding wire comprising a shell having a tubular cavity, which accommodates flux. The shell is made of 400 series stainless steels. The deposited metal formed after the welding using the flux-cored welding wire of the present invention has more uniform chemical compositions. Because the loss of chromium during the transition to the deposited metal is less than 0.1%, recourses is saved and welding cost is reduced. The filling ratio of the flux-cored welding wire of the present invention is 5%-25% (preferably 10%-20%). As a result, not only the stability of the compositions in the flux is increased, but also the disadvantages to the manufacture process caused by high filling ratio are avoided. The flux-cored welding wire of the present invention will not be rusty even after it is exposed to the air for a long time.

First claim

The invention claimed is:

1. A flux-cored welding wire for welding together ferritic stainless steel parts, comprising:
a stainless steel shell enclosed to form a tubular or circular cavity therein that contains flux, wherein the stainless steel shell is a 400 series stainless steel comprising between 10% and 18% chromium (Cr) by weight.

2. The flux-cored welding wire of claim 1 , wherein:
the stainless steel shell has been stretched by a stretching ratio of between 20% and 30% during manufacture of the flux-cored welding wire.

3. The flux-cored welding wire of claim 1 , wherein:
the stainless steel shell comprises 5% or less nickel (Ni) by weight.

4. The flux-cored welding wire according to claim 3 , wherein:
the stainless steel shell is substantially free of Ni.

5. The flux-cored welding wire of claim 1 , wherein:
the stainless steel shell is made of 409-type or 410-type stainless steel.

6. The flux-cored welding wire according to claim 1 , wherein:
the flux consists essentially of:
between 9% and 68% Cr by weight;
between 1% and 10% manganese (Mn) by weight;
between 2% and 15% silicon (Si) by weight; and
between 7% and 88% iron (Fe).

7. The flux-cored welding wire according to claim 1 , wherein:
the flux-cored welding wire is configured to produce a stainless weld deposit during an arc welding process, wherein the stainless weld deposit consists essentially of:
between 10% and 20% Cr by weight;
between 0.1% and 0.8% Mn by weight;
between 0.1% and 1% Si by weight; and
between 78% and 90% Fe by weight.

8. The flux-cored welding wire according to claim 1 , wherein:
the flux-cored welding wire is configured to produce a stainless weld deposit that welds together the ferritic stainless steel parts, wherein the stainless weld deposit comprises between 10% and 18% Cr by weight.

9. The flux-cored welding wire according to claim 8 , wherein:
the stainless weld deposit comprises less than 5% of nickel by weight.

10. The flux-cored welding wire according to claim 8 , wherein:
the stainless weld deposit is a 400 series of stainless steel weld deposit.

11. A flux-cored welding wire for welding together ferritic stainless steel parts comprises a stainless steel shell enclosed to form a tubular or circular cavity that contains flux, wherein the flux consists essentially of:
between 9% and 68% chromium (Cr);
between 1% and 10% manganese (Mn);
between 2% and 15% silicon (Si); and
between 78% and 90% iron (Fe) by weight.

12. The flux-cored welding wire of claim 11 , wherein:
the stainless steel shell comprises between 10% and 18% Cr by weight.

13. The flux-cored welding wire according to claim 12 , wherein:
the flux accounts for between 5% and 25% of the flux-cored welding wire by weight.

14. The flux-cored welding wire of claim 11 , wherein:
the stainless steel shell comprises 5% or less nickel (Ni) by weight.

15. The flux-cored welding wire according to claim 14 , wherein:
the stainless steel shell is substantially free of Ni.

16. The flux-cored welding wire of claim 11 , wherein:
the stainless steel shell is made of a 400 series stainless steel.

17. The flux-cored welding wire according to claim 11 , wherein:
the flux-cored welding wire is configured to produce a stainless weld deposit on a stainless steel workpiece, wherein the stainless weld deposit comprises between 10% and 18% Cr by weight.

18. The flux-cored welding wire according to claim 17 , wherein:
the stainless weld deposit comprises less than 5% of nickel by weight.

19. The flux-cored welding wire according to one of claim 18 , wherein:
the stainless weld deposit is a 400 series of stainless steel weld deposit.

20. The flux-cored welding wire according to claim 11 , wherein:
the flux-cored welding wire is drawn multiple times during manufacturing.

21. The flux-cored welding wire of claim 20 , wherein:
the stainless steel shell has been stretched by a stretching ratio of between 20% and 30% during manufacture of the flux-cored welding wire.

22. A ferritic stainless steel weld deposit that welds together ferritic stainless steel parts, wherein the ferritic stainless steel weld deposit is formed during an arc welding operation using a welding electrode that includes a stainless steel shell enclosed to form a tubular or circular cavity that contains flux, and wherein the flux consists essentially of: chromium (Cr), manganese (Mn), silicon (Si), and iron (Fe).

23. The ferritic stainless steel weld deposit of claim 22 , wherein the flux consists essentially of:
between 9% and 68% chromium (Cr);
between 1% and 10% manganese (Mn);
between 2% and 15% silicon (Si); and
between 78% and 90% iron (Fe) by weight.

24. The ferritic stainless steel weld deposit of claim 23 , wherein the stainless steel shell and the ferritic stainless steel weld deposit are both 400 series stainless steel.

Assignees

• Chen Fuhu
• Yan Jie
• Illinois Tool Works

Inventors

• Chen Fuhu
• Yan Jie

Classifications

• C22C38/26

  with niobium or tantalum · CPC title

• B23K35/406

  Filled tubular wire or rods (B23K35/402 takes precedence) · CPC title

• B23K35/3086

  containing Ni or Mn · CPC title

• B23K35/3608

  Titania or titanates · CPC title

• C22C38/38

  with more than 1.5% by weight of manganese · CPC title