The effect of alloy composition and welding conditions on columnar-equiaxed transitions in ferritic stainless steel gas-tungsten arc welds

1990 ◽  
Vol 21 (7) ◽  
pp. 2009-2019 ◽  
Author(s):  
J. C. Villafuerte ◽  
E. Pardo ◽  
H. W. Kerr
Keyword(s):  
Stainless Steel ◽  
Ferritic Stainless Steel ◽  
Alloy Composition ◽  
Gas Tungsten Arc ◽  
Gas Tungsten ◽  
Gas Tungsten Arc Welds

Hybrid (plasma+gas tungsten arc) weldability of modified 12% Cr ferritic stainless steel

2009 ◽  
Vol 30 (10) ◽  
pp. 4236-4242 ◽  
Author(s):  
Emel Taban ◽  
Erdinc Kaluc ◽  
Alfred Dhooge
Keyword(s):  
Stainless Steel ◽  
Ferritic Stainless Steel ◽  
Gas Tungsten Arc ◽  
Hybrid Plasma ◽  
Gas Tungsten

Qualification of Laser Welded High Performance S44660 Ferritic Stainless Steel for Condenser Tube Applications

2003 ◽  
Author(s):  
James D. Fritz ◽  
Curtis W. Kovach
Keyword(s):  
Stainless Steel ◽  
Ferritic Stainless Steel ◽  
High Performance ◽  
Sheet Material ◽  
Cooling Water ◽  
Welding Process ◽  
Gas Tungsten Arc ◽  
Critical Pitting Temperature ◽  
Gas Tungsten ◽  
Welding Processes

The laser tube welding process has for the first time been used to produce power plant steam condenser tubing in the high performance ferritic stainless steel grade UNS S44660. This material has traditionally been produced as welded tubing by the gas tungsten-arc welding process for use in seawater and other severe cooling water environments. To verify the corrosion resistance of this new product, corrosion tests have been conducted on production tubing to compare the traditional and new welding processes. The acidified ferric chloride test was used for evaluation because it is a meaningful aggressive test capable of measuring resistance to localized pitting corrosion, the most common potential failure mode for stainless steels used in cooling water environments. Pitting tests conducted over a range of temperatures produced a critical pitting temperature of 65°C for laser welded-annealed tube. This critical pitting temperature was demonstrated to be equal to that of as-produced S44660 sheet material or that of gas tungsten-arc produced tubing. The tubing met all other metallurgical and mechanical property quality requirements. When pitting did occur it exhibited no preference for initiation at welds. Thus, laser welded. high performance stainless condenser tubing should be fully capable of providing good performance in severe cooling water environments.

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