[Elecraft] I keep burning up tips. What's wrong?

[G. Beat (W9GB)]

FAQ:

Q: I keep burning up soldering iron tips. What's wrong?

A: This is a common occurrence when operators change solder types.

Traditionally only rosin core solder (Kester 44) was used. Usually an
operator will put the solder wire on the tip and let it melt and run down to
the connection.  http://www.kester.com/44.html

When people change to water soluble (like Kester 331) the flux does not run
down the tip, it wicks up the and as a result the tip burns and they get
poor soldering. It is important to stress good technique; they must apply
the iron to the joint, then on the other side of the joint apply the solder
(not touching the iron). After the solder begins to melt, remove the solder,
then the iron.

When people change from rosin to a No Clean (Kester 245) the problem is that
there is less flux. It is important for the operators to keep the iron tips
tinned at all times. If operators do not make a conscious effort to keep the
tips tinned they will eventually ruin them.
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Q: What is the difference between R, RMA and RA anyway?

A:
R - Type R stands for rosin. More specifically non-activated rosin. This is
the mildest type of flux available.

RMA - Type RMA stands for rosin, mildly activated. This is the most commonly
used flux type by military contractors. It has some activity but it is still
very mild.

RA - Type RA stands for rosin, activated. As a rule military contractors shy
away from this type of flux. On the commercial side type RA fluxes have been
more commonly used.
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Q: Is it safe to leave the residue from a type RA flux on an assembly?

A: Yes, for most applications. All rosin flux residues can be safely left on
an assembly provided the assembly does not heat up too high during use. What
is too high? Rosin starts to soften around 160oF and is completely liquid at
200oF. When the rosin softens it forms a conductive film and can short out a
board or assembly. If the board you are making will see temperatures in
excess of 160oF in its working life then you must clean the flux residue.
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