Microstructure evolution and properties of NiCrBSi thick coating remelted by gas tungsten arc

2018 ◽  
Vol 349 ◽  
pp. 260-271 ◽  
Author(s):  
Li Ya-long ◽  
Dong Tian-shun ◽  
Li Guo-lu ◽  
Wang Hai-dou ◽  
Fu Bin-Guo ◽  
...  
Keyword(s):  
Microstructure Evolution ◽  
Thick Coating ◽  
Gas Tungsten Arc ◽  
Gas Tungsten

Autogenous Tungsten Inert Gas and Gas Tungsten Arc With Filler Welding of Dissimilar P91 and P92 Steels

2018 ◽  
Vol 140 (2) ◽  
Author(s):  
Chandan Pandey ◽  
Manas Mohan Mahapatra ◽  
Pradeep Kumar ◽  
N. Saini
Keyword(s):  
Mechanical Properties ◽  
Microstructure Evolution ◽  
Welded Joints ◽  
Welding Process ◽  
Postweld Heat Treatment ◽  
Inert Gas ◽  
P92 Steel ◽  
Gas Tungsten Arc ◽  
Δ Ferrite ◽  
Gas Tungsten

Creep strength ferritic/martensitic modified 9Cr-1Mo-V-Nb (P91) steel also designated as ASTM A335 and P92 steel are used for piping, cladding, ducts, wrappers, and the pressure vessel in Gen IV nuclear reactors. In the present investigation, a comparative study of the effect of autogenous tungsten inert gas welding (A-TIG) with double pass and multipass gas tungsten arc (GTA) welding with filler on microstructure evolution in the weld fusion zone and the mechanical properties of P91 and P92 steel welded joints was carried out. The microstructure evolution was studied in as-welded and postweld heat treatment (PWHT) condition. The study also focused on the evolution of δ-ferrite patches and their influence on the tensile properties of welded joints. PWHT was carried out at 760 °C with durations from 2 to 6 h. To study the effect of δ-ferrite evolution on mechanical properties, Charpy toughness, microhardness, and tensile tests were performed. The acceptable microstructure and mechanical properties were obtained after the 6 h of PWHT for A-TIG arc welding process while for GTA weld with filler wire, it was obtained after the 2 h of PWHT at 760 °C.

Microstructure evolution of Inconel 625 with 0.4 wt% boron modification during gas tungsten arc deposition

2017 ◽  
Vol 694 ◽  
pp. 429-438 ◽  
Author(s):  
Y. Tian ◽  
B. Ouyang ◽  
A. Gontcharov ◽  
R. Gauvin ◽  
P. Lowden ◽  
...  
Keyword(s):  
Microstructure Evolution ◽  
Inconel 625 ◽  
Gas Tungsten Arc ◽  
Boron Modification ◽  
Gas Tungsten ◽  
Arc Deposition

Microstructure and mechanical property of Ni-based thick coating remelted by gas tungsten arc

Vacuum ◽  
2018 ◽  
Vol 155 ◽  
pp. 260-269 ◽  
Author(s):  
Li Ya-long ◽  
Dong Tian-shun ◽  
Li Guo-lu ◽  
Wang Hai-dou ◽  
Fu Bin-Guo ◽  
...  
Keyword(s):  
Mechanical Property ◽  
Thick Coating ◽  
Gas Tungsten Arc ◽  
Gas Tungsten ◽  
Microstructure And Mechanical Property

INVESTIGATION OF PULSE FREQUENCY ON FUSION ZONE CHARACTERISTICS OF GTA WELDED AZ31B MAGNESIUM ALLOY JOINTS

2020 ◽  
Vol 15 (2) ◽  
Author(s):  
Subravel V
Keyword(s):  
Magnesium Alloy ◽  
Tensile Properties ◽  
Fusion Zone ◽  
Welding Speed ◽  
Pulse Frequency ◽  
Pulsed Current ◽  
Az31b Magnesium Alloy ◽  
Gas Tungsten Arc ◽  
Gas Tungsten ◽  
Different Levels

In this investigation an attempt has been made to study the effect of welding on fusion characteristics of pulsed current gas tungsten arc welded AZ31B magnesium alloy joints. Five joints were fabricated using different levels of welding speed (105 mm/min –145 mm/min). From this investigation, it is found that the joints fabricated using a welding speed of 135 mm/min yielded superior tensile properties compared to other joints. The formation of finer grains and higher hardness in fusion zone and uniformly distributed precipitates are the main reasons for the higher tensile properties of these joints

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