Hi Ian,

What does Johnson matthey suggest 🤔?

Keith

Don't get too hung up on different MP solders for assemblies. Can you pin thefirst joints with small screws or rivets? Also, you can often get away with using one grade of solder if the first joints are kept slightly away from the flame for the later joints, since remelting seems torequire a slightly higher temperature than the initial melt.

As Clive says if you can get away with just one then that would be the easiest option as 55% solder is really the lowest melting of whats available to us now so the easiest to get to flow.

If you do want a higher temp one for the first heats then a 30% silver content one would give you a melting point that should not overlap, just take care not to distort any parts due to excess clamping pressure as the metal is starting to get a bit soft at the elevated temps. You will also want a flux that cane take the higher temps and longer time needed to get the work upto them such as HT5