Behavior of weld pool convection and columnar-to-equiaxed grain transition in gas tungsten arc welds of ferritic stainless steels with different aluminum contents

2021 ◽  
Vol 289 ◽  
pp. 116946
Author(s):  
Chan Kyu Kim ◽  
Jin Hyeok Kim ◽  
Hyun Uk Hong ◽  
Won Bae Lee ◽  
Sun Koo Kim ◽  
...  
Keyword(s):  
Weld Pool ◽  
Stainless Steels ◽  
Ferritic Stainless Steels ◽  
Gas Tungsten Arc ◽  
Gas Tungsten ◽  
Gas Tungsten Arc Welds ◽  
Equiaxed Grain

Corrosion Resistance of Welds in 21%Cr Ferritic Stainless Steels – Is it Comparable to Type 304L?

2013 ◽  
Vol 762 ◽  
pp. 734-740
Author(s):  
Severi Anttila ◽  
Hannu Pekka Heikkinen
Keyword(s):  
Corrosion Resistance ◽  
Ferric Chloride ◽  
Stainless Steels ◽  
Optical Emission Spectroscopy ◽  
Salt Spray ◽  
Optical Emission ◽  
Ferritic Stainless Steels ◽  
Gas Tungsten Arc ◽  
Gas Tungsten Arc Welds ◽  
Steel Welds

Corrosion resistance of gas-tungsten arc welds in two 21% chromium ferritic stainless steels was benchmarked against ferritic type 441 and austenitic type 304L stainless steels. Salt spray, pitting corrosion and ferric chloride tests were carried out for autogenous welds. Also, electron microscopy and glow discharge optical emission spectroscopy examinations were made.The corrosion resistance in 21% chromium ferritic steel welds in chloride environments was seen comparable to those in type 304L, and an improvement was observed when compared to type 441 steel. However, the Mn-Cr-Ti-S sulfide domain may have an undesirable influence on end-grain pitting in ferric chloride test. Weld oxidation results in poor corrosion protection, and artificial mechanical cleaning alone is inadequate for restoring this, and hence pickling is advised.

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