Production and repair welding of spheroidal graphite cast iron

Patent metadata

Field	Value
Publication number	US-2021237190-A1
Application number	US-201917050488-A
Country	US
Kind code	A1
Filing date	Apr 25, 2019
Priority date	May 23, 2018
Publication date	Aug 5, 2021
Grant date	—

Abstract

A method for producing a surface of a base material, wherein the base material has spheroidal graphite cast iron, wherein firstly a partial surface is located, in a further step a two-ply buffer layer is used by means of TIG welding with the welding additive NiFe, wherein in a further step a fill layer is applied to the buffer layer, wherein the MIG welding method is used in conjunction with NiFe-2 in accordance with EN ISO 107 as welding additive material.

First claim

1 .- 13 . (canceled)

14 . A method for producing a surface of a base material, wherein the base material comprises cast iron, the method comprising:
localizing a partial surface only on the surface of the one base material, producing a first buffer layer on the partial surface, wherein a buffer welding process is used in conjunction with a buffer welding additive, wherein welding parameters are selected such that a heat input into the base material is low, producing a fill layer on the buffer layer, wherein a MAG welding process is used, wherein a NiFe welding filler material is used, wherein no preheating is performed, wherein a MIG welding process is employed during production of the buffer layer, and a welding additive is used which comprises substantially 65% by weight of Ni and substantially 30% by weight of Fe, wherein, during production of the fill layer, a welding additive is used which comprises substantially 55% by weight of Ni and substantially 30% by weight of Fe.

15 . The method as claimed in claim 14 ,
wherein argon is used during the production of the buffer layer; wherein a mixture of argon and CO2 is used during the production of the fill layer.

16 . The method as claimed in claim 14 ,
wherein a WIG welding process is employed as buffer welding process, and both during the buffer welding process and during the MAG welding process a welding additive is used which comprises substantially 55% by weight of Ni and substantially 30% by weight of Fe.

17 . The method as claimed in claim 14 ,
wherein the base material comprises spheroidal graphite cast iron.

18 . The method as claimed in claim 14 ,
wherein the partial surface has an indentation.

19 . The method as claimed in claim 14 ,
wherein a WIG welding process is employed as buffer welding process.

20 . The method as claimed in claim 19 ,
wherein NiFe welding additive is used as welding additive.

21 . The method as claimed in claim 14 ,
wherein the MIG welding process is employed as buffer welding process.

22 . The method as claimed in claim 21 ,
wherein NiFe welding additive is used as welding additive.

23 . The method as claimed in claim 14 ,
wherein a second buffer layer is applied prior to production of the fill layer.

24 . The method as claimed in claim 14 ,
wherein production of the surface takes place at temperatures below 100° C.

25 . A component for a turbomachine,
produced by a method as claimed in claim 14 .

26 . The method as claimed in claim 14 ,
wherein the NiFe welding filler material comprises a NiFe welding additive.

27 . The method as claimed in claim 26 ,
wherein the NiFe welding additive comprises a NiFe-2 type in accordance with EN ISO 1071.

28 . The method as claimed in claim 20 ,
wherein the NiFe welding additive comprises NiFe-2 type in accordance with EN ISO 1071.

29 . The method as claimed in claim 22 ,
wherein the NiFe welding additive comprises NiFe-1 type in accordance with EN ISO 1071.

Assignees

• Siemens Ag

Inventors

• Brussk Stefan
• Luithle Alexander
• Schreiber Tim

Classifications

• B23K35/383

  mainly containing noble gases or nitrogen · CPC title

• B23K35/3066

  with Ni as next major constituent · CPC title

• B23K9/167

  and of a non-consumable electrode · CPC title

• B23K9/04 Primary

  Welding for other purposes than joining, e.g. built-up welding · CPC title

• B23K2103/06

  Cast-iron alloys · CPC title