by Sunday | Oct 2 | NABTEB QUESTIONS
ANSWER A weld defect is an imperfection on the weld which may lead to failure of the joint under service e.g. undercut, porosity, and blow holes e.t.c.
by Sunday | Oct 2 | NABTEB QUESTIONS
ANSWER Cast iron is very brittle and this makes it difficult to weld unlike steel. Heat treatment is therefore required. (i) Heat treatment of cast iron before welding prevents cracking due to expansion and contraction. (ii) Heat treatment enables a sound weld to be...
by Sunday | Oct 2 | NABTEB QUESTIONS
(i) Ductility: This is the ability of material to be drawn into thin wire without fracture e.g. copper, aluminum, e.t.c. it is the opposite of brittleness. (ii) Malleability: This is the ability to be hammered, rolled or bent without fracture or ability of metal to...
by Sunday | Oct 2 | NABTEB QUESTIONS
ANSWER Neutral flame is generally used for brazing. Oxidizing flame may be used when present metal or filler rod contains about 50% zinc to prevent zinc loss during soldering.
by Sunday | Oct 2 | NABTEB QUESTIONS
ANSWER (i) To dissolve any oxide that is present on metal surface. (ii) To prevent corrosion or oxidation by excluding air. (iii) It enables spelter to flow easily along the joint. (iv) It enables solder to adhere to metal surface.
Land Law and the Consequences of Unauthorized Land Transfers in Nigeria
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