Weldability of Controlled Rolled Micro Alloyed Thick HSLA Steel Plates for Fabrication of Penstock Liners
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Authors
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Department of Metallurgical and Materials Engineering Indian Institute of Technology Roorkee - 247667 ,IN
P. K. Ghosh -
Department o f Metallurgical and Materials Engineering Indian Institute o f Technology Roorkee - 247667 ,INA. K. Saxena
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Department o f Metallurgical and Materials Engineering Indian Institute o f Technology Roorkee - 247667 ,INK. Devakumaran
Abstract
Weldability of a controlled rolled HSLA steel plates having thickness of 18, 25 and 34 mm has been studied by multipass SAW process with SMAW ischolar_main pass. The mechanical and metallurgical properties of the all weld deposit and axial weld joint have been studied. In 34 mm thick plate the weld metal microstructure has been found comparatively finer with more reheat refinement than 18 mm and 25mm thick plates, with improved properties. The weld joints are generally found to fracture from the region away from fusion line showing the strength of the weld higher than the base material. However, the presence of certain amount of inclusions may have lowered the mechanical properties of weld deposits up to certain extent. Reheat refining has been found to improve the toughness of weld metal. The toughness of HAZ mostly found comparable to that of the base metal as such the weldability of controlled rolled HSLA steel has been qualified for welding fabrication of penstock liner.
