welding

Question 1

MIG
Welding

Answer 1

Uses electricity to generate the
heat required to weld materials.
Metal Inert Gas

Question 2

MIG
Welding-advantage

Answer 2

*Suitable for large scale
production.
*Varying thickness of
materials can be joined.
*Reduced cost because the
production of neat and clean
metal deposits on the
workpiece means there is no
need for extra cleaning.

Question 3

Oxy-
acetylene

Answer 3

A gas welding process where a
flame is produced using a mixture
of oxygen and acetylene. No
pressure on the product is
required – heat is there to control
the welding of the parts.

Question 4

Oxy-
acetylene-advantages

Answer 4

*Easy of controlling the low
and high temperatures needed
for welding, brazing and
soldering as the gas can be
mixed manually.
*Relatively inexpensive in
comparison with other welding
processes and commonly found
in school or college workshops.

Question 5

Spot
Welding

Answer 5

A type of electrical resistance
welding generally used to join
sheet material together. The basic
principle uses a transformer with
2 electrodes. When they trap the
sheet material they generate
enough heat to fuse the two
together.

Question 6

Spot-advantage
Welding

Answer 6

*The process is free from
fumes or spatter.
*Requires little or no
maintenance.
*Cost effective.

Question 7

Welding

Answer 7

A permanent fabrication
process. Most methods use
intense heat to fuse metal
together using a number of
energy sources (gas or
electric arc, laser or ultra
sound).

Question 8

Casting,

Answer 8

A process which involves
pouring or injecting a liquid
metal into a mould. The mould
contains a cavity that takes the
shape of the desired object
where the metal is allowed to
cool and solidify.

Question 9

Forging

Answer 9

A process which involves a
metal being heated up and
shaped by plastic
deformation. It is usually
applied by applying some
kind of squeezing force
(compression) such as
hammer blows using a large
power press.

Question 10

Shearing

Answer 10

A process used to cut straight lines on a range of materials from sheet metal to angle bar
stock.
An upper and a lower blade are forced past each other, usually one of the blades is
stationary.
Materials that are sheared commonly include aluminium, brass, mild steel and stainless
steel.