US2120525A - Method of building up pitted holes in a metal sheet - Google Patents

Method of building up pitted holes in a metal sheet Download PDF

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Publication number
US2120525A
US2120525A US145782A US14578237A US2120525A US 2120525 A US2120525 A US 2120525A US 145782 A US145782 A US 145782A US 14578237 A US14578237 A US 14578237A US 2120525 A US2120525 A US 2120525A
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United States
Prior art keywords
pitted
building
sheet
crown
holes
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Expired - Lifetime
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US145782A
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Thomas J Mckerihan
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Thomas J Mckerihan
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Priority to US145782A priority Critical patent/US2120525A/en
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Publication of US2120525A publication Critical patent/US2120525A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23POTHER WORKING OF METAL; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P6/00Restoring or reconditioning objects
    • B23P6/04Repairing fractures or cracked metal parts or products, e.g. castings
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00Metal working
    • Y10T29/49Method of mechanical manufacture
    • Y10T29/4935Heat exchanger or boiler making
    • Y10T29/49352Repairing, converting, servicing or salvaging
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00Metal working
    • Y10T29/49Method of mechanical manufacture
    • Y10T29/49718Repairing
    • Y10T29/49721Repairing with disassembling
    • Y10T29/49723Repairing with disassembling including reconditioning of part
    • Y10T29/49725Repairing with disassembling including reconditioning of part by shaping
    • Y10T29/49726Removing material
    • Y10T29/49728Removing material and by a metallurgical operation, e.g., welding, diffusion bonding, casting
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00Metal working
    • Y10T29/49Method of mechanical manufacture
    • Y10T29/49718Repairing
    • Y10T29/49746Repairing by applying fluent material, e.g., coating, casting

Description

June 14, 1938. I J, McKE RIHAN I 4 2,120,525

METHOD OF BUILDING UP FITTED HOLES IN A METAL SHEET Filed Jun 1, 1957 FIG: I FIGHZIZI 113 L6 1 1B 5 Z WITNESSES: I I N V EN TOR:

I Thomas J M Kerihan,

Patented June 14, 1938 UNITED STATES PATENT OFFICE METHOD OF BUILDING UP PITTED' HOLES IN A METAL SHEET My invention relates generally to the building up of corroded or worn metals and more particularly to a method of building up pitted holes in a metal sheet.

Becoming more specific my invention is immediately concerned with building up pitted holes in the crown sheet of a boiler in which the welding is done from the fire side of the sheet. In crown sheet boilers, where crown stays are used to support the pressure load, the part of the crown sheet surrounding the crown stay is subject to grooving action, which thins the sheet to the extent that the crown sheet, as a whole or in part, has to be renewed. Much difficulty is experienced in building up pitted holes by welding when the work is done from the water side of the boiler because of the cramped and obscured working space. In attempting to build up from the water side of the boiler sheet, long electrodes to reach the pitted parent metal are necessary for the autogenous or self-produced welding process and this has proved unsatisfactory for the operators vision is seriously obstructed. Work done in this manner has a rough corrugated surface which cannot be dressed smooth in order to prevent the accumulation of sediment.

Therefore the principal object of my invention is to provide a method of building up pitted holes in the crown sheet of a boiler by which the welding and other operations can be done from the fire side of the sheet. Another object is to provide a method for the rebuilding of any corroded sheet from the side opposite the corroded surface. Further advantages will become apparent from the following description of a preferred form of my invention, reference being had to the accompanying drawing.

Fig. I of the drawing shows a vertical section of a portion of the crown sheet of a boiler which has been pitted around a crown stay on the water side, the crown stay not being shown.

Fig. II shows a plan View of the same. Fig. III shows a vertical sectional view of the same after the corroded area on the water side of the crown sheet has been pressed into a smooth surface from the fire side.

Fig. IV is a vertical section of the same showing a building up by the addition of metal from the fire side.

Fig. V is a plan view from the fire side of the sheet showing the built up metal of Fig. IV; and, Fig. VI is a vertical section showing the built up crown sheet after the hole for the crown stay has been re-drilled and the excess building up metal smoothed off on the fire side of the crown sheet.

In the preferred practice of my method of building up a corroded area on the water side of the crown sheet of a boiler, I first heat the 5 parent metal in the corroded area 3 and then apply a backing element I against the water side A of the crown sheet 2, the crown stay having first been removed fromthe crown stay hole 5. This backing means I may be of any con- 10 venient form which can be easily positioned in the restricted area inside of a boiler. The backing means I should extend over a pitted area 3 in the water side A of the crown sheet 2 to be built up and must be securely positioned and 15 heavy enough to resist a pressure forcing out the pitted area 3 against the backing means I.

I then apply pressure to the fire side B of the crown sheet 2 until the corroded area 3 is forced out into a smooth surface on the water side A 20 against the backing means I, as shown in Fig. III, leaving a depression 6 on the fire side B. Any convenient pressure means may be used; I have used with success a pneumatic hammer of a well-known type. The next step is the build- 25 ing up of the depression 6 on the fire side B of the crown sheet 2 caused by forcing out the corroded area 3 against the backing means I. I use autogenous welding to build up this depression 6 from the fire side B, but other suitable 30 types of welding could be used, if desirable. Fig. IV shows welding material 1 after the aforesaid depressed area 6 has been built up by welding. The welding material 1 is distributed generously with a view to a final grinding and boring of 35 the hole 5. I then re-drill the hole 5 for the crown stay and grind off the excess of the welding material 1 on the fire side B. The finished product is shown in Fig. VI, ready to be re-tapped and to then receive the crown stay in re-assem- 0 bling for further use. The smooth surface on the water side A is substantially as good as the original surface.

Thus my invention provides a simple and practical method of building up the corroded area shown in Fig. I by working from the fire side B instead of the water side A which is so cramped and inaccessible. I have found that my method of repairing crown sheets has greatly reduced 50 the difficulty of building up these pitted areas and made it possible to repair corrosion in much less time than formerly was needed. The finished product is also much better than the results previously obtained by working from the water 55 10 said pitted area, applying pressure rigidly over the area of said sheet opposite the pitted side, pressing said pitted area outwardly against the backing means until a smooth surface is obtained on the previously pitted side, building up by autogenous welding the depressions caused by said application of pressure to the side opposite to the pitted area of said sheet, removing the excess Welding material, and redrilling a hole for the crown bolt.

THOMAS J. McKERIHAN.

US145782A 1937-06-01 1937-06-01 Method of building up pitted holes in a metal sheet Expired - Lifetime US2120525A (en)

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US145782A US2120525A (en) 1937-06-01 1937-06-01 Method of building up pitted holes in a metal sheet

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US145782A US2120525A (en) 1937-06-01 1937-06-01 Method of building up pitted holes in a metal sheet

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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2688796A (en) * 1950-10-05 1954-09-14 American Car & Foundry Co Method of treating sheet metal to remove buckles
US2946118A (en) * 1955-12-22 1960-07-26 George L Steck Method of repairing dents
US3449816A (en) * 1967-04-24 1969-06-17 Dwain K Swick Method of repairing screw-in precombustion chamber type openings in cylinder heads
US4050133A (en) * 1976-06-07 1977-09-27 Cretella Salvatore Method of refurbishing turbine vanes and the like
US4104777A (en) * 1974-06-18 1978-08-08 Hilti Aktiengesellschaft Repair of bottle top molds
US4121894A (en) * 1975-09-15 1978-10-24 Cretella Salvatore Refurbished turbine components, such as vanes or blades
US4346508A (en) * 1980-05-30 1982-08-31 Caterpillar Tractor Co. Reboring fixture and method
US6620274B1 (en) * 1999-09-17 2003-09-16 Denso Corporation Method of repairing aluminum heat exchanger
US20040216295A1 (en) * 2003-05-02 2004-11-04 Bridges Michael D. Method for repairing a casting
US20070084906A1 (en) * 2005-10-13 2007-04-19 Chris Vargas Hole repair technique and apparatus
EP1916051A1 (en) * 2006-10-27 2008-04-30 United Technologies Corporation Method of repairing an aperture and defect in a part with welding using an insert with top and runoff plates and backing
US20090250441A1 (en) * 2005-10-13 2009-10-08 United Technologies Corporation Bolt hole repair technique
US20100016657A1 (en) * 2006-04-24 2010-01-21 Continence Control Systems International Pty Ltd Method and Apparatus for Managing Erectile Dysfunction
US20100183431A1 (en) * 2009-01-20 2010-07-22 United Technologies Corporation Repair of case flange with bolt holes

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2688796A (en) * 1950-10-05 1954-09-14 American Car & Foundry Co Method of treating sheet metal to remove buckles
US2946118A (en) * 1955-12-22 1960-07-26 George L Steck Method of repairing dents
US3449816A (en) * 1967-04-24 1969-06-17 Dwain K Swick Method of repairing screw-in precombustion chamber type openings in cylinder heads
US4104777A (en) * 1974-06-18 1978-08-08 Hilti Aktiengesellschaft Repair of bottle top molds
US4121894A (en) * 1975-09-15 1978-10-24 Cretella Salvatore Refurbished turbine components, such as vanes or blades
US4141127A (en) * 1975-09-15 1979-02-27 Cretella Salvatore Method of refurbishing turbine vane or blade components
US4050133A (en) * 1976-06-07 1977-09-27 Cretella Salvatore Method of refurbishing turbine vanes and the like
US4346508A (en) * 1980-05-30 1982-08-31 Caterpillar Tractor Co. Reboring fixture and method
US6620274B1 (en) * 1999-09-17 2003-09-16 Denso Corporation Method of repairing aluminum heat exchanger
US20040216295A1 (en) * 2003-05-02 2004-11-04 Bridges Michael D. Method for repairing a casting
US7047612B2 (en) 2003-05-02 2006-05-23 Caterpillar Inc. Method for repairing a casting
US7552855B2 (en) 2005-10-13 2009-06-30 United Technologies Corporation Hole repair technique and apparatus
US20070084906A1 (en) * 2005-10-13 2007-04-19 Chris Vargas Hole repair technique and apparatus
US20090250441A1 (en) * 2005-10-13 2009-10-08 United Technologies Corporation Bolt hole repair technique
US9227278B2 (en) 2005-10-13 2016-01-05 United Technologies Corporation Bolt hole repair technique
US20100016657A1 (en) * 2006-04-24 2010-01-21 Continence Control Systems International Pty Ltd Method and Apparatus for Managing Erectile Dysfunction
US20080099446A1 (en) * 2006-10-27 2008-05-01 United Technologies Corporation Insert weld repair
US8299389B2 (en) 2006-10-27 2012-10-30 United Technologies Corporation Insert weld repair
US7858897B2 (en) 2006-10-27 2010-12-28 United Technologies Corporation Insert weld repair
US20110024398A1 (en) * 2006-10-27 2011-02-03 United Technologies Corporation Insert weld repair
US20110031223A1 (en) * 2006-10-27 2011-02-10 United Technologies Corporation Insert weld repair
US8153922B2 (en) 2006-10-27 2012-04-10 United Technologies Corporation Insert weld repair
EP1916051A1 (en) * 2006-10-27 2008-04-30 United Technologies Corporation Method of repairing an aperture and defect in a part with welding using an insert with top and runoff plates and backing
US8230569B2 (en) 2009-01-20 2012-07-31 United Technologies Corporation Repair of case flange with bolt holes
US20100183431A1 (en) * 2009-01-20 2010-07-22 United Technologies Corporation Repair of case flange with bolt holes

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