Welding, Metal Fabrication & Automotive Systems is one of 9 topics in the Grade 12 Mechanical Technology CAPS syllabus, covered across 3 lessons on Study Vault. Below are real practice questions from this topic with full worked answers.
Sample practice questions
Easy
1. What role does the flux coating on an MMAW (arc/stick) welding electrode serve?
It produces a shielding gas and a protective slag layer, protecting the molten metal from atmospheric contamination
It only serves to colour the finished weld
It replaces the need for an electric arc entirely
It has no functional purpose beyond holding the electrode together
Answer: It produces a shielding gas and a protective slag layer, protecting the molten metal from atmospheric contamination — The flux coating on an MMAW electrode produces a shielding gas and a protective slag layer over the weld as it cools, protecting the molten metal from atmospheric contamination.
Easy
2. Which weld joint type has two pieces meeting at a right angle, forming a T-shape?
A tee joint
A butt joint
A lap joint
A corner joint
Answer: A tee joint — A tee joint has one piece meeting another at a right angle, forming a T-shape, distinct from a butt joint (edge to edge, same plane) or a lap joint (overlapping).
Medium
3. Name the weld defect where small gas pockets are trapped in the solidified weld, typically caused by contamination or poor shielding.
Answer: porosity — Porosity is small gas pockets trapped in the solidified weld metal, typically caused by contamination or inadequate shielding during welding.
