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weld overlays

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Published: 01 January 2017
Fig. 15.9 Schematic of weld overlay for repair of a pipe girth weld. IGSCC, intergranular stress-corrosion cracking More
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Published: 01 March 2001
Fig. 8 Volume steady-state erosion rates of weld-overlay coatings at 400 °C (750 °F) as a function of average microhardness at 400 °C (90° impact angle; alumina erodent). Source: Ref 45 More
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Published: 01 December 2006
Fig. 13 Weld overlay IGSCC mitigation technique. ID, inside diameter; OD, outside diameter More
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Published: 01 November 2007
Fig. 10.26 Chronology of the total area of the weld overlay applied to the waterwalls of coal-fired boilers (both subcritical and critical units) from early 1990s to 2001 as a function of the year of application for three major overlay alloys—Type 309, alloy 625, and alloy 622—by a weld More
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Published: 01 November 2007
Fig. 10.46 Circumferential grooves formed in Type 430 weld overlay on the waterwall tube in a coal-fired boiler. Source: Ref 60 More
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Published: 01 November 2007
Fig. 10.95 One tube with a proprietary HF35 hardfacing weld overlay showing manually applied weld overlay beads along the tube that are still visible after exposure for approximately 3 years as part of an in-bed evaporator tube bundle in a 130 MWe bubbling fluidized-bed boiler. Courtesy More
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Published: 01 November 2007
Fig. 10.102 The surface of HF35 weld overlay tube at the windward side after exposure for 2 years as part of the hanger tube for the economizer in a circulating fluidized-bed boiler. The overlay contained hardfacing chromium eutectic carbides (dark phases) formed along interdendritic More
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Published: 01 November 2007
Fig. 12.22 Pitting attack is the common mode of corrosion of alloy 625 weld overlay on the waterwall. Shown in the photograph are three tubes and three membranes. More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1995
DOI: 10.31399/asm.tb.sch6.t68200369
EISBN: 978-1-62708-354-6
... Abstract This chapter covers the basics of weldability of cast steels such as carbon and low alloy steels, corrosion-resistant high alloy steels, nickel-base alloys, heat-resistant high alloy steels, and wear-resistant high austenitic manganese steels. It provides an overview of weld overlay...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2001
DOI: 10.31399/asm.tb.secwr.t68350125
EISBN: 978-1-62708-315-7
... overlays, thermal spraying, and various deposition technologies. ceramic coating chemical vapor deposition cladding corrosion resistance electroless plating electroplating hot dip metallic coating physical vapor deposition thermal spraying weld overlays THE SURFACE-ENGINEERING METHODS...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2007
DOI: 10.31399/asm.tb.htcma.t52080003
EISBN: 978-1-62708-304-1
... Abstract This chapter explains how materials selection becomes much more difficult when designing for high-temperature corrosion environments. It also discusses the use of cladding and weld overlays to compensate for material deficiencies and prolong service life. corrosion resistance...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2013
DOI: 10.31399/asm.tb.mfub.t53740325
EISBN: 978-1-62708-308-9
... Abstract This chapter covers a wide range of finishing and coating operations, including cleaning, honing, polishing and buffing, and lapping. It discusses the use of rust-preventative compounds, conversion coatings, and plating metals as well as weld overlay, thermal spray, and ceramic...
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Published: 01 November 2007
Fig. 12.23 Repair welding can be performed on the corroded waterwall overlay by grinding followed by overlay welding. An alloy 625 weld overlay on the waterwall after 10 years of service in a RDF unit. Shown in the photograph are two tubes and three membranes. More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2007
DOI: 10.31399/asm.tb.htcma.t52080335
EISBN: 978-1-62708-304-1
... an automatic gas metal arc welding (GMAW) process ( Ref 23 ). A total of about 21,000 lb of alloy 625 weld overlay metal was applied to this boiler. The performance of the waterwall overlay of alloy 625 in this first overlaid waterwall proved to be very successful during the next 3 to 4 years of boiler...
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Published: 01 November 2007
Fig. 10.98 Cross sections of Type 309 overlay tube (a) and HF35 overlay tube (b) showing the wastage profile of the weld overlay after exposure of 2 years as part of the hanger tube for the economizer in a circulating fluidized-bed boiler. The top of the tube cross section was the windward More
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2007
DOI: 10.31399/asm.tb.htcma.t52080259
EISBN: 978-1-62708-304-1
... of Welding Services Inc. Maximum outer tube metal temperature limits based on oxidation for common ferritic steels used in waterwalls, as suggested by a boiler designer Table 10.4 Maximum outer tube metal temperature limits based on oxidation for common ferritic steels used in waterwalls...
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Published: 01 November 2007
Fig. 12.15 Internal dendrite corrosion attack that followed general wastage was observed in the overlay of an alloy 622 weld overlay in an alloy 622 overlay superheater tube. Lower-magnification micrographs showing the through-thickness overlay is shown in Fig. 12.16(a) and general surface More
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Published: 01 March 2001
Fig. 2 Relative costs (based on pounds of alloy deposited) for various weld overlay and thermal spray processes. SAW, submerged arc welding; FCAW, flux-cored arc welding; GMAW, gas metal arc welding; SMAW, shielded metal arc welding; OAW, oxyacetylene gas welding; FLSP, flame spraying; PSP More
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Published: 01 November 2007
Fig. 10.49 Microhardness profile measured using Vickers hardness tester with a 500 g load as a function of the distance from the overlay surface for alloy 625 weld overlay on the waterwall of a supercritical boiler after 1 year of operation when circumferential grooves, as shown in Fig. 10.36 More
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Published: 01 November 2007
Fig. 10.25 Optical micrograph showing nonprotective Fe-Cr oxide scales formed on the ″430SS″ weld overlay. Courtesy of Welding Services Inc. More