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Metal joining processes

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Metal joining processes

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About this activity

welding and brazing

Created by

Monica Fatuzzo
Monica Fatuzzo
Italy

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Metal joining processes
 

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Metal joining processesOnline version

welding and brazing

by Monica Fatuzzo
1

oxyacetylene MIG joining solidify TIG heat molten welding permanently

The main method of permanently joining metals is by
. There are many variations of welding including
and , welding , electric arc and spot
and seam welding . All involve joining metals
by the use of , causing the 2 main pieces of metal to
become and using a material to mix them
before they , forming a permanent , strong joint .
Welding can be repetitive and because of this robots can
be used to weld in particularly unpleasant environments or
when mass production is required , e . g . car industry .

2

temperatures copper soldering 880°C alloy spelter 870 steel

Brazing is used to join
metals such as and
. Brazing is similar to
but uses much
higher
( ? ) . The rod
used to fuse the two
pieces together is called
the brazing and is composed of an of copper
and zinc . When the correct temperature is reached , the
spelter melts and fills the joint by capillary action . The
joint is allowed to cool and harden before the excess flux is
remove d

3

heated degreased cool lowest 625°C 200°C Hard melting soft harden Soft

.
Soldering
The two main types of soldering are :
? soldering .
? soldering .
The principle of the two methods is the same ; however , the
point in hard soldering is , whereas in
soldering the melting point is approximately .
The stages in the soldering process are :
1 . 2 . 3 . 4 . Materials are cleaned and . The surfaces of the
two materials can be kept clean by use of a flux .
The surfaces must fit together without gaps and must
be held together securely while being heated .
A heat source such as a blow torch is used to heat the
materials around the joint to make sure that both pieces
are evenly . The solder filler rod is rested on the
joint and as it starts to melt , capillary action will allow
the solder to run between the joint .
Once filled , the joint will be left to and .

 
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