bids are invited for repair, maintenance, and installation of plant/ systems/equipments (version 2) - onboard ins pralaya at nd(mb); rebuilding of propeller shaft by manual metal arc welding process - ins pralaya; service provider - to remove fatigued/damaged surface of the shaft by machining on the lathe machine. , machining to be done till sound free surface. , dye penetrant test/ non-destructive testing to confirm the solid and defect free surface for welding. , pre heating the portion to be welded approximately @200-250 c. baking of electrode @150 c for one hour. base layer with welding electrode lh 1105-3.2 mm. mechanical cleaning on the first layer for dye penetrate test for checking surface cracks. if any. , maintain inter-pass temperature @ 150c and top layer build up using welding electrode lh 521-3.2mm. welding subsequence layer to achieved final diameter, considering machining allowance. , wrapping the welded area in asbestos/ ceramic cloth for heat at 50c per hour for 4 hours, followed by slow cooling till room temperature. , machining/ grinding to required diameter.