Microstructural analysis of laser weld fusion zone in Haynes 282 superalloy

2012 ◽  
Vol 65 ◽  
pp. 93-99 ◽  
Author(s):  
L.O. Osoba ◽  
R.G. Ding ◽  
O.A. Ojo
Keyword(s):  
Fusion Zone ◽  
Microstructural Analysis ◽  
Laser Weld ◽  
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.

Understanding of Laser and Hybrid Welding Phenomena

2008 ◽  
Vol 580-582 ◽  
pp. 535-538 ◽  
Author(s):  
Seiji Katayama ◽  
Yousuke Kawahito ◽  
Masami Mizutani
Keyword(s):  
Stainless Steel ◽  
Aluminum Alloy ◽  
Fusion Zone ◽  
Molten Pool ◽  
Bubble Formation ◽  
Hybrid Welding ◽  
Laser Weld ◽  
Pool Surface ◽  
Weld Fusion Zone ◽  
Keyhole Behavior

This paper describes laser and hybrid welding phenomena for the production of a sound and deep weld. The penetration of laser weld beads depended upon the power and power density at low and high welding speeds, respectively. It was reveled that the weld fusion zone geometry was formed by keyhole behavior and melt flows. It was also understood that the production of sound welds without porosity was attributed to no bubble formation in TIG-YAG hybrid welding of stainless steel and the disappearance of bubbles from the molten pool surface in YAG-MIG hybrid welding of aluminum alloy.

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.

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