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| The gas tungston arc welding (GTAW)is | | | | To prevent this the process is carried out |
| employed for welding of thin plates.In GTAW | | | | above 1050°C.Above 1050 °C, the volume |
| of standard 2205 duplex stainless steel ( | | | | fraction of ? ferrite increases with |
| DSS) plate of 5 mm thickness, which is having | | | | annealing temperature. The increase of ? |
| 22.37% Cr and 5.74% Ni is used in this study. | | | | ferrite occurs at a faster rate in the HAZ |
| Weld beads were produced with ER 2209 filler | | | | than in the base metal and fusion zone. |
| wire of higher alloy content (22% Cr and 9% | | | | Optimal mechanical properties and an |
| Ni). The shielding gas Argon was employed in | | | | acceptable ferrite/ austenite ratio |
| this work. The interpass temperatures were | | | | throughout the weld regions corresponds to |
| kept as 1100 C. | | | | annealing at 1050 °C. |
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| The phase transformations and mechanical | | | | The main aim of this work is to investigate |
| behaviour during welding and | | | | the defect in the weldment by the use of |
| subsequent.Annealing treatment of 2205 duplex | | | | x-ray (NDT). The macro and microstructure |
| stainless steel have been investigated. | | | | examinations, as well as the evaluations of |
| Detailed microstructural examination showed | | | | the mechanical properties such as impact and |
| the presence of higher ferrite amounts in the | | | | hardness were carried out. And also the |
| heat affected zone (HAZ), while higher | | | | pitting corrosion resistances were evaluated. |
| amounts of austenite were recorded in the | | | | Results are discussed in detail. |
| centre region of the weld metal. Generaly | | | | |
| Annealing treatments in the temperature range | | | | Â |
| of 800-1000 °C resulted in a precipitation | | | | |
| of ? phase and chromium carbides at the | | | | Keywords: DSS, GTAW, weld defect, macro and |
| austenite and ferrite (?/?) interfaces that | | | | microstructure, mechanical properties, |
| were found to be preferential precipitation | | | | pitting corrosion. |