Laves Phase Control in Inconel 718 Weldments

2012 ◽  
Vol 710 ◽  
pp. 614-619 ◽  
Author(s):  
S.G.K. Manikandan ◽  
D. Sivakumar ◽  
M Kamaraj ◽  
K. Prasad Rao
Keyword(s):  
Solid Solution ◽  
Fusion Zone ◽  
Inconel 718 ◽  
Welding Process ◽  
Gta Welding ◽  
Phase Control ◽  
Laves Phase ◽  
Filler Wire ◽  
Shielding Gas ◽  
Zone Microstructure

The detrimental laves formation in fusion zone during welding of Inconel 718 is controlled with compound current pulsing technique along with helium shielding gas. Also solid solution filler wire is used to minimize the niobium segregation. Welds were produced in 2mm thick sheets by GTA welding process and subjected to the characterization techniques. The results show, refined fusion zone microstructure, reduced amount of laves phase, minimum niobium segregation and softer fusion zone in the as welded condition.

Effect of base metal and welding speed on fusion zone microstructure and HAZ hot-cracking of electron-beam welded Inconel 718

2016 ◽  
Vol 89 ◽  
pp. 964-977 ◽  
Author(s):  
Yunpeng Mei ◽  
Yongchang Liu ◽  
Chenxi Liu ◽  
Chong Li ◽  
Liming Yu ◽  
...  
Keyword(s):  
Electron Beam ◽  
Fusion Zone ◽  
Base Metal ◽  
Welding Speed ◽  
Inconel 718 ◽  
Hot Cracking ◽  
Zone Microstructure

scholarly journals Effect of the Addition of Nitrogen through Shielding Gas on TIG Welds Made Homogenously and Heterogeneously on 300 Series Austenitic Stainless Steels

2021 ◽  
Vol 5 (3) ◽  
pp. 72
Author(s):  
Rohit Kshirsagar ◽  
Steve Jones ◽  
Jonathan Lawrence ◽  
Jamil Kanfoud
Keyword(s):  
Fatigue Life ◽  
Stainless Steels ◽  
Feed Rate ◽  
Welding Process ◽  
Austenitic Stainless Steels ◽  
Interaction Effects ◽  
Bead Geometry ◽  
Filler Wire ◽  
Shielding Gas ◽  
Wire Feed

Tungsten inert gas (TIG) welding of austenitic stainless steels is a critical process used in industries. Several properties of the welds must be controlled depending on the application. These properties, which include the geometrical, mechanical and microstructural features, can be modified through an appropriate composition of shielding gas. Researchers have studied the effects of the addition of nitrogen through the shielding gas; however, due to limited amount of experimental data, many of the interaction effects are not yet reported. In this study, welds were made homogeneously as well as heterogeneously with various concentrations of nitrogen added through the shielding gas. The gas compositions used were 99.99%Ar (pure), 2.5% N2 + Ar, 5% N2 + Ar and 10% N2 + Ar. Additionally, the welding process parameters were varied to understand different interaction effects between the shielding gas chemistry and the process variables such as filler wire feed rate, welding current, etc. Strong interactions were observed in the case of heterogeneous welds between the gas composition and the filler wire feed rate, with the penetration depth increasing by nearly 30% with the addition of 10% nitrogen in the shielding gas. The interactions were found to influence the bead geometry, which, in turn, had an effect on the mechanical properties as well as the fatigue life of the welds. A nearly 15% increase in the tensile strength of the samples was observed when using 10% nitrogen in the shielding gas, which also translated to a similar increase in the fatigue life.

scholarly journals Structure of MMCs with SiC Particles after Gas-tungsten Arc Welding

2015 ◽  
Vol 15 (4) ◽  
pp. 65-68 ◽  
Author(s):  
E. Przełożyńska ◽  
K.N. Braszczyńska-Malika ◽  
M. Mróz
Keyword(s):  
Fusion Zone ◽  
Arc Welding ◽  
Welding Process ◽  
Welding Current ◽  
Gta Welding ◽  
Magnesium Matrix ◽  
Gas Tungsten Arc ◽  
Sic Particles ◽  
Gtaw Process ◽  
Gas Tungsten

Abstract The gas-tungsten arc (GTA) welding behaviors of a magnesium matrix composite reinforced with SiC particles were examined in terms of microstructure characteristics and process efficiencies. This study focused on the effects of the GTAW process parameters (like welding current in the range of 100/200 A) on the size of the fusion zone (FZ). The analyses revealed the strong influence of the GTA welding process on the width and depth of the fusion zone and also on the refinement of the microstructure in the fusion zone. Additionally, the results of dendrite arm size (DAS) measurements were presented.

Effect of weld cooling rate on Laves phase formation in Inconel 718 fusion zone

2014 ◽  
Vol 214 (2) ◽  
pp. 358-364 ◽  
Author(s):  
S.G.K. Manikandan ◽  
D. Sivakumar ◽  
K. Prasad Rao ◽  
M. Kamaraj
Keyword(s):  
Cooling Rate ◽  
Fusion Zone ◽  
Phase Formation ◽  
Inconel 718 ◽  
Laves Phase
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