ANSWER A weld defect is an imperfection on the weld which may lead to failure of the joint under service…
ANSWER Cast iron is very brittle and this makes it difficult to weld unlike steel. Heat treatment is therefore required.…
(i) Ductility: This is the ability of material to be drawn into thin wire without fracture e.g. copper, aluminum, e.t.c.…
ANSWER Neutral flame is generally used for brazing. Oxidizing flame may be used when present metal or filler rod contains…
ANSWER (i) To dissolve any oxide that is present on metal surface. (ii) To prevent corrosion or oxidation by excluding…
(i) D.C. machines can be used to weld non-ferrous metals. (ii) Bare wire electrodes can be carefully used. (iii) It…
Destructive tests are those tests carried out with the joint destroyed by bending, cutting or application of chemical e.g. microscopic,…
(i) The current should be reduced to normal. (ii) A wet electrode should be dried especially in the oven. (iii)…
Excessive spatter may occur in arc welding as a result of: (i) Too high welding current used (ii) Wet electrode…
(i) A non-ferrous metal (aluminum) can be heat treated by annealing after cold working which increases hardness. This can be…