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t5e.txt
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1998-10-05
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Summary
This topic covers the steps required to join
copper pipes by soldering end feed fittings to the
copper pipes. Follow these steps to find out more:
1 Cleaning the pipes
2 Applying the flux
3 Assembling the fitting
4 Applying the solder
Tools
Pipe cutter, brush, blow torch.
Materials
Lead free solder,flux.
Step 1 - Cleaning the pipes
Pipes must be cleaned from oxidation and grease and the
ends must be free of burr before you fit them. Use a pipe
cutter to attain a clean cut. If you would like to know
more, click the icon below.
Step 2 - Applying the flux
Apply the flux to the cleaned surface with a brush. Flux
is a heat activated acid that will very thoroughly clean
the copper allowing the solder to alloy itself to it,
forming an extremely strong bond almost as though welded
together.
Step 3 - Assembling the fitting
Push the pipe into the fitting as far as it will go.
Step 4 - Applying the solder
Heat the joint with a blow-torch until you see flux
vapours escaping. Remove the heat before applying the
lead-free solder round the whole fitting. Re-apply
the heat until a silver ring of solder appears all the
way round. When the solder has cooled it should have a
shiny surface and have no obvious ridges or lumps.
The surface should be concave where it covers the join.
If the solder is dull, this is a "dry" joint which will
need to be re-soldered.