The effect of shielded metal arc and gas tungsten arc welding methods on 308L stainless steel weldments (original) (raw)
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Journal of Materials Processing Technology, 1999
The effect of welding process shielding gas and the addition of grain re®ning elements on the weld zone tensile properties of a ferritic stainless steel conforming to AISI 430 has been investigated. Gas tungsten arc welds exhibiting equi-axed grain morphology had superior tensile and yield strength compared to shielded metal arc welds. The tensile ductility of gas tungsten arc welds was also on an average marginally greater than that of shielded metal arc welds. Welds in general showed low ductility compared to that of the base metal. The addition of titanium and copper led to improved strength over that of the base alloy. The observed properties could be correlated to the austenite content and the fracture morphology.
IJERT-Gas Tungsten Arc Welding of AISI 304 Austenitic Stainless Steels
International Journal of Engineering Research and Technology (IJERT), 2016
https://www.ijert.org/gas-tungsten-arc-welding-of-aisi-304-austenitic-stainless-steels https://www.ijert.org/research/gas-tungsten-arc-welding-of-aisi-304-austenitic-stainless-steels-IJERTV4IS120219.pdf The aim of this present experimental work is to evaluate the effect of welding when similar metals of AISI 304 austenitic stainless steel are joined. Gas tungsten arc welding (GTAW) was employed to join the plates. GTAW is an electric arc welding process, which produces an arc between a non-consumable tungsten electrode and the work to be welded in an inert gas atmosphere mainly to avoid atmospheric contamination. Plates of 6mm thickness were joined using a double v-groove in the presence of filler material. The mechanical properties including tensile properties and hardness were analyzed. This experimental study reveals that the ultimate tensile strength of the weld zone is marginally decreased as compared to base metal and the ductility of the base metal is predominantly higher as compared to weld bead. All the properties were correlated with their microstructural analysis.
Journal of emerging technologies and innovative research, 2016
In this work, an investigation on the influences of welding processes on the exposure of Duplex stainless steel (DSS) Alloy 2205 using Gas Tungsten Arc Welding and Gas Manual Arc Welding was carried out. The Duplex stainless steel (DSS) Alloy 2205 containing 22%Cr, 5%Ni, ferritic-austenitic material is an emerging class of stainless steel currently being selected for a variety of applications especially where corrosion is of major concern. It have good mechanical properties and high resistance to all forms of corrosion combined with its high strength-to-mass ratio. These properties allow for savings both in terms of structural weight and maintenance costs. In this work, the Gas Tungsten Arc (GTAW) and the Shielded Metal Arc (SMAW) welding processes were used to weld a 200mm x 16.53mm thick duplex alloy 2205 stainless steel pipe to determine which of the processes will cause susceptibility of the alloy to intergranular corrosion at the grain boundaries. Various tests were carried out on transverse specimens cut out from the welds made with both processes. These tests included metallurgical, compositional analysis across the weld profiles, hardness, and tensile test. The test results for the compositional analysis showed an insignificant depletion of chromium from 22.06 at the weld cap to 19.96 at the root of the TIG weld. This depletion is not enough to cause sensitization although there were likely precipitates in the weld and HAZ from the Microstructural analysis. The hardness across the welds profile revealed that there was a uniform distribution of hardness across the MMA weldment when compared to the TIG weld which dropped drastically at the weld metal region from 337.2 and 328.7 to 256.5 and 252.0 at the face and root respectively. The mechanical properties of both welds have not shown any major deviations from the standard Alloy SAF 2205 properties. They are within the acceptable range. The test results obtained indicated that with proper control and monitoring of the welding parameters, the SMAW can be effectively used to weld the Alloy 2205 with comparable high quality of properties.