GMAW NC II case studies
GMAW NC II · Put your knowledge to work in context.
GMAW NC II is a Philippine TVET qualification under the Technical Education and Skills Development Authority (TESDA) framework. It certifies that a welder can perform Gas Metal Arc Welding - also called MAG or CO2 welding - to the standard expected of a skilled production or fabrication welder. The GMAW NC II case studies are 5 cases and about 3,414 words.
1Three Welders, One Small Room, and a Clogged Extractor
A three-person crew is GMAW-welding 6 mm mild-steel brackets in a 4 m × 5 m room with a 2.7 m ceiling. Ventilation is one open window (0.6 m × 0.9 m) and a pedestal fan blowing across the bench.
679 words, about 3 min2Staggered Intermittent Fillet and a Bevel That Was Not on the Drawing
A fitter is given a drawing for a 6 mm mild-steel bracket. The welding symbol on the reference line shows a 6 mm fillet weld, length 60 mm, pitch 120 mm, on both sides, with the upper and lower symbols offset from each other.
667 words, about 3 min3A Butt Joint Set Up With a Kinked Liner and a Worn Contact Tip
A welder sets up a butt joint in 6 mm mild-steel plate using 1.2 mm ER70S-6 wire and 75% Ar/25% CO₂. The machine is set to 21 V, 170 A, wire feed 6.5 m/min, gas flow 12 L/min measured at the regulator, stick-out about 18 mm.
708 words, about 4 min4Vertical-Up Fillet With Undercut and Root Lack of Fusion
A welder is making a 10 mm fillet weld in the vertical-up (3F) position on a column stiffener using 1.2 mm ER70S-6 wire and 75/25 gas. Settings are 24 V, 210 A, gas 14 L/min, stick-out 20 mm.
663 words, about 3 min5Twelve Guardrail Joints, Porosity at Restart, and a Crater Crack
Twelve identical 8 mm lap joints in a guardrail assembly are welded by GMAW at 22 V, 180 A with 1.2 mm ER70S-6 and 75/25 gas. The WPS requires 100% visual inspection and a 10% destructive bend test on production coupons.
697 words, about 3 min