The larger the copper core the longer it will take to heat up enough to draw the solder in so use a higher temperature soldering iron for larger cables if you can.
Tinned copper wire soldering.
Tinned copper wire is particularly useful in wastewater treatment facilities underground subway systems and projects exposed to excess oil gas or water.
The best solder to use for tinning stranded copper wire is electrical grade rosin core solder.
Tinned copper wire is also easier to solder to connections as tin is a key element in soldering ensuring all parts of the wire are protected against corrosion.
By not tinning the wire you can get a better gas tight joint.
Also tinned copper is easier to connect because tin is a primary component in solder.
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I d suggest trying to find another source for wire or perhaps try a different patina.
Tinned copper wire is particularly useful in industrial cranes subways and marine projects where the tin coat makes the wire more resistant to water.
Tinning wires before soldering is al.
Never use solder that contains acid which can damage the wire or its insulation.
Tinned copper wire can last up to 10 times longer than its non tinned counterpart and because solder is composed primarily of tin tinned wire is incredibly easy to solder.
If the solder coating doesn t have the right components the patina won t react with it.
I ve had lead free solder in the past that doesn t turn black with my patina but.
Acid core solder is intended for use in plumbing applications.
The solder on the pre tinned wire needs to compatible with the patina used.
To tin a contact on an audio xlr connector hold the iron on the outside of the the contact for a second or two then apply the solder into the cavity of the contact.
This is an acid free solder that contains a flux in the core of the solder.