EXPERIMENTAL INVESTIGATION ON MECHANICAL PROPERTIES OF TITANIUM / STEEL GTAW WELDED JOINTS
Keywords:
Titanium, Steel, GTAW, Microstructures, tensile strength, impact strength, microhardness.Abstract
Titanium and its alloys are widely used due to their unique combination of properties, viz, high strength to weight ratio, high corrosion resistance. In atomic power reactors, petroleum refineries and processing industries the titanium and steel are joined by welding to replace titanium with stainless steel plates [3, 6]. The stainless steel is replaced with the titanium due to high strength, low density and good corrosion resistance of titanium. Therefore there is need to study the weldability of titanium and steel. The mechanical properties of these joints greatly influence the application of these materials [1-2, 7-8]. The objective of this investigation is to study the mechanical properties of Gas Tungsten Welded (GTAW) titanium / stainless steel joints. The joints were fabricated using titanium (Grade 2)/stainless steel (202) plates. The 2 mm thick plates were cut by shearing to size of 150 × 100 mm. The welding was carried out by using GTAW process in the temperature range of 930 to 1000ºc. Since the iron present in the steel has very less solubility in titanium an electrode (filler rod) having composition of Cu-12Mn-2Ni was used to overcome this problem. The welded joints were subjected to tensile test, hardness survey and microstructural investigation. The microstructure analysis showed good grain structure and lack of any defects. The mechanical strength of the joint was good and this investigation proved that titanium could be welded to steel, provided suitable parameters and proper filler material are used.
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