Dissimilar Welding of T92/T91/T22 Steels Used in Supercritical Power Plant

Hsing Ting Kuo; Ying Cheng Liu; Jian Yuan Huang; R.K. Shiue

doi:10.4028/www.scientific.net/KEM.803.8

Paper Titles

Preface

Influence of Multi-Step Austempering Temperature on Tensile Performance of Unalloyed Ductile Iron
p.3

Microstructures and Mechanical Properties of Friction Welded Steel Tubes
p.13

Grain Refining Effect of Al-5Ti-1B Master Alloy on Microstructures and Mechanical Properties of A356 Alloy
p.17

Severe Plastic Deformation of Al-15Zn-2Mg Alloy: Effect on Wear Properties
p.22

Experimental and Simulation Method of Introducing Compressive Residual Stress in ASTM A516 Grade 70 Steel
p.27

Effect of Linear Energy Density on Bubble-Defect of 316L Stainless Steel by Selective Laser Melting
p.32

Effect of Solution Treatment Time on Microhardness of High Nitrogen Austenitic Stainless Steel
p.37

HomeKey Engineering MaterialsKey Engineering Materials Vol. 803Dissimilar Welding of T92/T91/T22 Steels Used in...

Dissimilar Welding of T92/T91/T22 Steels Used in Supercritical Power Plant

Abstract:

Dissimilar tungsten inert gas (TIG) welding of furnace tube alloys, T92, T91 and T22, using TG-S2CM, TG-S2CW and TG-S9Cb fillers is performed in the experiment. Post weld heat treatments (PWHTs) of specimens selected from wire cutting of the qualified weldments are carried out in order to evaluate carbon migration phenomena. The soft zone resulted from carbon migration can be evaluated by optical microscope and microhardness tests. Based on the long-term aging test results, obvious soft zone is found from the weldment with significant difference in alloying concentrations. There is no soft zone in T92/T91 dissimilar weldment using the TG-S9Cb filler after the aging test. In contrast, soft zones are observed from the interfaces, TG-S2CM/T92 and TG-S2CW/T92. The size of soft zone (~50 μm) using TG-S2CW filler is much less than that using TG-S2CM filler (~200 μm). The application of TG-S2CW filler shows potential in welding/repair welding of T92/T22 tubes in supercritical boilers.

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Periodical:

Key Engineering Materials (Volume 803)

Pages:

8-12

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.803.8

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Online since:

May 2019

Authors:

Hsing Ting Kuo, Ying Cheng Liu, Jian Yuan Huang, R.K. Shiue*

Keywords:

Aging, Carbon Migration, Dissimilar Welding, Microstructure, Supercritical Power Plant

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* - Corresponding Author

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