0

Full Content is available to subscribers

Subscribe/Learn More  >

Modified GTAW Orbital Tube-to-Tubesheet Welding Technique, and the Effect of a Copper Weld Retainer During Welding of Alloy 825

[+] Author Affiliations
Angel Krustev

Kelvion Thermal Solutions Ltd., Johannesburg, South Africa

Boian Alexandrov, Jerry Kovacich

Ohio State University, Columbus, OH

Paper No. PVP2017-65971, pp. V06AT06A021; 5 pages
doi:10.1115/PVP2017-65971
From:
  • ASME 2017 Pressure Vessels and Piping Conference
  • Volume 6A: Materials and Fabrication
  • Waikoloa, Hawaii, USA, July 16–20, 2017
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 978-0-7918-5799-1
  • Copyright © 2017 by ASME

abstract

Tube-to-tubesheet welds are an essential part of the design of heat exchangers used in power generation, petro-chemical, chemical processing, pharmaceutical, and food processing industries. The tube-to-tubesheet welds are typically produced using gas tungsten arc welding (GTAW) with or without the addition of filler wire, and involve carbon steels and various creep and corrosion resistant alloys. The weld heat input in tube-to-tubesheet welds is an essential parameter that controls the productivity and weld quality, in terms of weld bead geometry and heat affected zone microstructure and properties.

A modified GTAW tube-to-tubesheet orbital welding head that utilizes a copper weld retainer is described in this paper. The copper weld retainer provides a heat sink during welding, and supports the molten weld metal. This permits the use of a relatively high heat input, required for a single pass welding with filler wire addition. Furthermore, the copper retainer limits the amount of weld overlap into the tube bore.

The application of the modified orbital welding technique, which helped for resolving a suspected liquation cracking problem in Alloy 825 tube to 316L stainless steel tubesheet welds, is presented.

Copyright © 2017 by ASME

Figures

Tables

Interactive Graphics

Video

Country-Specific Mortality and Growth Failure in Infancy and Yound Children and Association With Material Stature

Use interactive graphics and maps to view and sort country-specific infant and early dhildhood mortality and growth failure data and their association with maternal

NOTE:
Citing articles are presented as examples only. In non-demo SCM6 implementation, integration with CrossRef’s "Cited By" API will populate this tab (http://www.crossref.org/citedby.html).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In