Dissimilar welding of nickel-based Alloy 690 to SUS 304L with Ti addition

Hwa-Teng Lee, S. L. Jeng, C. H. Yen, T. Y. Kuo

Research output: Contribution to journalArticle

67 Citations (Scopus)

Abstract

This study investigates the effects of Ti addition on the weldability, microstructure and mechanical properties of a dissimilar weldment of Alloy 690 and SUS 304L. Shielding metal arc welding (SMAW) is employed to butt-weld two plates with three welding layers, where each layer is deposited in a single pass. To investigate the effects of Ti addition, the flux coatings of the electrodes used in the welding process are modified by varying additions of either a Ti-Fe compound or a Ti powder. The results indicate that the microstructure of the fusion zone (FZ) is primarily dendritic. With increasing Ti content, it is noted that the microstructure changes from a columnar dendritic to an equiaxed dendritic, in which the primary dendrite arm spacing (PDAS) becomes shorter. Furthermore, it is observed that the amount of Al-Ti oxide phase increases in the inter-dendritic region, while the amount of Nb-rich phase decreases. Moreover, the average hardness of the FZ increases slightly. The results indicate that Ti addition prompts a significant increase in the elongation of the weldment (i.e. 36.5%, Ti: 0.41 wt%), although the tensile strength remains relatively unchanged. However, at an increased Ti content of 0.91 wt%, an obvious reduction in the tensile strength is noted, which can be attributed to a general reduction in the weldability of the joint.

Original languageEnglish
Pages (from-to)59-69
Number of pages11
JournalJournal of Nuclear Materials
Volume335
Issue number1
DOIs
Publication statusPublished - 2004 Oct 1

Fingerprint

Nickel
welding
Welding
Weldability
nickel
weldability
Microstructure
Tensile strength
Fusion reactions
tensile strength
microstructure
fusion
Electric arc welding
arc welding
Shielding
Powders
Oxides
Elongation
Welds
dendrites

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering
  • Materials Science(all)

Cite this

Lee, Hwa-Teng ; Jeng, S. L. ; Yen, C. H. ; Kuo, T. Y. / Dissimilar welding of nickel-based Alloy 690 to SUS 304L with Ti addition. In: Journal of Nuclear Materials. 2004 ; Vol. 335, No. 1. pp. 59-69.
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abstract = "This study investigates the effects of Ti addition on the weldability, microstructure and mechanical properties of a dissimilar weldment of Alloy 690 and SUS 304L. Shielding metal arc welding (SMAW) is employed to butt-weld two plates with three welding layers, where each layer is deposited in a single pass. To investigate the effects of Ti addition, the flux coatings of the electrodes used in the welding process are modified by varying additions of either a Ti-Fe compound or a Ti powder. The results indicate that the microstructure of the fusion zone (FZ) is primarily dendritic. With increasing Ti content, it is noted that the microstructure changes from a columnar dendritic to an equiaxed dendritic, in which the primary dendrite arm spacing (PDAS) becomes shorter. Furthermore, it is observed that the amount of Al-Ti oxide phase increases in the inter-dendritic region, while the amount of Nb-rich phase decreases. Moreover, the average hardness of the FZ increases slightly. The results indicate that Ti addition prompts a significant increase in the elongation of the weldment (i.e. 36.5{\%}, Ti: 0.41 wt{\%}), although the tensile strength remains relatively unchanged. However, at an increased Ti content of 0.91 wt{\%}, an obvious reduction in the tensile strength is noted, which can be attributed to a general reduction in the weldability of the joint.",
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Dissimilar welding of nickel-based Alloy 690 to SUS 304L with Ti addition. / Lee, Hwa-Teng; Jeng, S. L.; Yen, C. H.; Kuo, T. Y.

In: Journal of Nuclear Materials, Vol. 335, No. 1, 01.10.2004, p. 59-69.

Research output: Contribution to journalArticle

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