ITI/NCVT Welder (Fab & Fit) (AITT Theory) case studies
ITI/NCVT Welder (Fab & Fit) (AITT Theory) · Put your knowledge to work in context.
The ITI/NCVT Welder (Fabrication & Fitting) All India Trade Test is the theory examination taken by trainees who have completed the two-year ITI trade course in welding under the NCVT framework. It is intended for apprentices and ITI trainees who want a nationally recognised trade qualification for employment in fabrication shops, structural steelwork, pressure-vessel work, shipbuilding, railways, and general engineering maintenance. The ITI/NCVT Welder (Fab & Fit) (AITT Theory) case studies are 5 cases and about 3,245 words.
1Repairing a Diesel Tank from Inside the Manhole
A 1,200 mm diameter × 2,500 mm long mild steel diesel tank is emptied and water-washed. A 300 mm crack in the bottom shell must be repaired by SMAW from inside.
700 words, about 4 min2Interpreting Shell and Nozzle Weld Symbols on a Stainless Tank
A workshop is fabricating a 1,000 mm × 600 mm × 800 mm rectangular tank from 6 mm 316L stainless steel plate. The longitudinal shell seam is detailed as a single-V butt weld on the arrow side, 60° included angle, 2 mm root gap and 1.5 mm root land; the tail of the symbol reads 'GTAW root, SMAW fill'.
715 words, about 4 min3Crack Beside a Cast Iron Repair on a Gearbox Housing
A grey cast iron gearbox housing has a 70 mm crack running from a mounting bolt hole into the flange. The section thickness is 25 mm and the part is highly restrained by the adjacent bearing bore.
595 words, about 3 min4Bow and Diamonding in a Welded Box Beam
A 6 m long box beam, 300 mm deep × 200 mm wide, is fabricated from 8 mm mild steel plate with four continuous 6 mm longitudinal fillet welds at the corners. Two welders first completed both top fillets from one end to the other, then completed both bottom fillets.
605 words, about 3 min5Porosity and Slag in an E7018 Pressure Vessel Seam
A 12 mm thick SA516 Gr 70 pressure-vessel shell seam is welded with 4.0 mm E7018 electrodes on a 400 A AC transformer. The electrodes were opened three days earlier and kept in an open rack; shop humidity is 80% and the monsoon season is on.
630 words, about 3 min