FCAW NC II case studies
FCAW NC II · Put your knowledge to work in context.
The FCAW NC II is a Philippine national certificate issued under the Technical Education and Skills Development Authority (TESDA) system. It certifies that a welder can perform flux-cored arc welding to the standards expected in industry. The FCAW NC II case studies are 5 cases and about 2,562 words.
1Confined-space FCAW repair with rising CO2
A two-person crew is repairing a corroded bulkhead inside a 21.6 m³ steel compartment of a barge. The work uses FCAW with 1.2 mm E71T-1 wire and 100% CO2 at 15 L/min.
548 words, about 3 min2Drawing symbol conflict on a field-welded stiffener
Fabrication drawing F-204 shows a 10 mm stiffener plate welded to the web of a 16 mm built-up column. The weld symbol on the arrow side of the reference line is a fillet with '8' to the left and '150–300' to the right; a circle sits at the arrow-to-reference-line junction, a black flag is shown at the same junction, and the tail reads 'FCAW'.
579 words, about 3 min3Porosity and low current on a horizontal fillet
A shop is FCAW-welding a 12 mm mild-steel T-joint in the horizontal fillet position with 1.2 mm E71T-1 wire and CO2. The machine is set at 26 V and 8.5 m/min wire-feed speed; the welder uses a 22 mm contact-tip-to-work distance, 10° drag angle, and 15 L/min gas flow at the regulator.
514 words, about 3 min4Delayed transverse cracks in a tank seam
A 16 mm thick longitudinal seam in a carbon-steel tank is welded by FCAW with 1.2 mm E71T-1 wire and CO2, using a single-V groove, 60° included angle, 2 mm root face, and 3 mm root gap. The WPS specifies 100–150 A root, 220–260 A fill, 24–28 V, preheat 10°C minimum, interpass max 250°C, and heat input 0.8–1.5 kJ/mm.
486 words, about 2 min5Rework Pareto and first-off porosity in a fabrication shop
A fabrication shop produces about 120 m of FCAW fillet weld per day on 8–12 mm mild-steel frames. Last month’s inspection data show 11.2% rework: porosity 42%, undercut 23%, spatter 15%, incomplete fusion 12%, other 8%.
435 words, about 2 min