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2525909
Marking & Joining
Description
higher gcse DT Mind Map on Marking & Joining, created by melissaivana13 on 17/04/2015.
No tags specified
metals
dt
designtechnology
cuttingmetals
shearing
bending
pressing
drilling
chiselling
screws
threadcutting
mig
tig
brazing
dt
higher gcse
Mind Map by
melissaivana13
, updated more than 1 year ago
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Created by
melissaivana13
over 9 years ago
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Resource summary
Marking & Joining
Scriber
Sharp tool to mark accurate lines
Divider
Mark out circles or arcs.
One point digs in the material, whilst the other makes a line in the material.
Odd-leg calipers
Scribe line parallel to a staight edge.
The notched leg slide along material edge while the scriber point makes a line.
Surface gauge
Mark accurate parallel lines.
Dot punch
Marks positions of drill holes and make small dotted dents on already marked out lines.
Has a conical point ground to 60 degrees
Centre punch
Has a conical tip ground to 90 degrees.
Marks the centre of holes for drilling.
The punch is put into the dot punch mark and enlarges it.
Welding
Heat melts the edges of the metals being joined and forms a pool of molten metal. Then leave to cool.
Soldering
Bonds an alloy to form a joint.
'Parent metals' dont melt. The surface is cleaned with flux and heat is applied using a gas torch.
The solder is applied, which melts and 'runs' between the metals.
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