Analysis of the Corrosion Behavior of an A-TIG Welded SS 409 Weld Fusion Zone

2017 ◽  
Vol 26 (11) ◽  
pp. 5375-5384 ◽  
Author(s):  
R. S. Vidyarthy ◽  
D. K. Dwivedi
Keyword(s):  
Fusion Zone ◽  
Corrosion Behavior ◽  
Weld Fusion Zone

scholarly journals Microstructural Characterization of Laser Weld of Hot-Stamped Al-Si Coated 22MnB5 and Modification of Weld Properties by Hybrid Welding

Materials ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 3943
Author(s):  
Hana Šebestová ◽  
Petr Horník ◽  
Šárka Mikmeková ◽  
Libor Mrňa ◽  
Pavel Doležal ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Fusion Zone ◽  
Microstructural Characterization ◽  
Tensile Tests ◽  
Laser Weld ◽  
Martensitic Microstructure ◽  
Laser Welds ◽  
Weld Properties ◽  
Weld Fusion Zone

The presence of Al-Si coating on 22MnB5 leads to the formation of large ferritic bands in the dominantly martensitic microstructure of butt laser welds. Rapid cooling of laser weld metal is responsible for insufficient diffusion of coating elements into the steel and incomplete homogenization of weld fusion zone. The Al-rich regions promote the formation of ferritic solid solution. Soft ferritic bands cause weld joint weakening. Laser welds reached only 64% of base metal's ultimate tensile strength, and they always fractured in the fusion zone during the tensile tests. We implemented hybrid laser-TIG welding technology to reduce weld cooling rate by the addition of heat of the arc. The effect of arc current on weld microstructure and mechanical properties was investigated. Thanks to the slower cooling, the large ferritic bands were eliminated. The hybrid welds reached greater ultimate tensile strength compared to laser welds. The location of the fracture moved from the fusion zone to a tempered heat-affected zone characterized by a drop in microhardness. The minimum of microhardness was independent of heat input in this region.

Effect of Welding Speed on the Microstructure and Corrosion Properties of Weld and Heat Affected Zones in GTA Welded AA2014 Alloy

2019 ◽  
Vol 969 ◽  
pp. 834-838
Author(s):  
M.P. Shankar ◽  
R. Sokkalingam ◽  
Bhavani Kosuri ◽  
K. Sivaprasad ◽  
V. Muthupandi
Keyword(s):  
Fusion Zone ◽  
Welding Speed ◽  
Corrosion Potential ◽  
Gta Welding ◽  
Optical Microscope ◽  
Nacl Solution ◽  
Corrosion Properties ◽  
Gas Tungsten Arc ◽  
Aa2014 Alloy ◽  
Weld Fusion Zone

The microstructure and corrosion properties of weld fusion zone and the heat affected zones of gas tungsten arc (GTA) welded AA2014 alloy, welded at varying speeds of 1.5mm/s, 2.5 mm/s and 3.5 mm/s were examined for gaining knowledge on the effect of welding speed on corrosion behavior at localized regions of the weldment. The macrostructure and microstructure of the welds were evaluated with optical microscope. The corrosion properties were examined with potentiodynamic polarization in aqueous 3.5% NaCl solution. The GTA welding has resulted in grain refinement fusion zone and dispersion of coarse Al2Cu phases within the grains and along the grain boundaries of heat affected zones. With increase in welding speed the grain size of AA2014 at the fusion zone reduces significantly and also the corrosion resistance of the fusion zone and heat affected zone could decrease as it shows higher negative corrosion potential.

Novel non-destructive technique for detecting the weld fusion zone using a filler wire of high x-ray contrast

2021 ◽  
pp. 102537
Author(s):  
J. Galos ◽  
B. Ghaffari ◽  
E.T. Hetrick ◽  
M.H. Jones ◽  
M.J. Benoit ◽  
...  
Keyword(s):  
Fusion Zone ◽  
Filler Wire ◽  
X Ray ◽  
Weld Fusion Zone ◽  
Non Destructive

Influence of heat treatment on corrosion behavior of laser welded Mg-Gd-Y fusion zones

2020 ◽  
Vol 67 (4) ◽  
pp. 337-343
Author(s):  
Lyuyuan Wang ◽  
Jian Huang ◽  
Yong Peng ◽  
Yang Jia ◽  
Rong Ni
Keyword(s):  
Corrosion Resistance ◽  
Fusion Zone ◽  
Corrosion Behavior ◽  
Corrosion Mechanism ◽  
Content Type ◽  
Treated Condition ◽  
Heat Treated ◽  
Protective Films ◽  
Heat Treated Condition ◽  
Treated State

Purpose This paper aims to evaluate the corrosion resistance of fusion zones in different heat treated condition from laser welded Mg-Gd-Y alloys and analyze their intrinsic corrosion mechanism. Design/methodology/approach The corrosion behavior of fusion zone from laser-welded Mg-Gd-Y alloy joints in the as-welded, ageing and solution + ageing conditions was investigated in the 3.5 wt.% NaCl solution by immersion tests. Findings The corroded surface of as-welded fusion zone consists of dark and bright regions, and the bright regions were composed of high-density needle-like products, whereas some different extended direction of the cracks with lots of long ultrafine needle-shaped corrosion products appeared in the dark regions. The corrosion resistance of the fusion zone is slightly decreased after the ageing treatment. Originality/value The solution + ageing treated fusion zone exhibits the highest corrosion resistance than that of the as-welded and ageing treated state because of the full dissolution of the cathodic coarse eutectic compound, grains growth and relatively compact protective films. The inhomogeneous distribution of the β′ can somewhat improve the corrosion rate of solution + ageing treated fusion zone when compared with base metal.

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