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What factors are considered before type of solder job
Maximum temperature of the fluid in the tube
Pressure if the fluids to be conveyed
Tube size (the larger the tube the greater the forces on the tube wall)
What is a soft solder
Soft solder is an alloy of tin or one or more antimony, copper, lead, silver and may be used to join most metals. When specifying a soft solder, the tin content is always mentioned fist
For example
30/70 solder
Means 30 tin 70 lead
Any lead bearing solder content in excess of 0.2% shall not be used in potable water lines
What is flux
And what is it’s purpose
The primary purpose of the flux is to keep the surface of the metal free if oxides during the hearing and filling process. If the oxide or scale is not removed it limits the wetting action/capillary attraction thus preventing actual penetration of the grain boundaries
Prevent oxidation
Promote wetting action
Break up oxides and float them to the top of the joint
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