IMO the secret to soldering PE is the "precise" application of the heat and properly cleaned attaching surfaces. By precise heat application I mean either the amount or location or both in most instances.
Soldering with a Resistance soldering unit allows for both. I use Tweezers almost exclusively when soldering thin or PE components, it is like "Spot Welding". The heat is quick and localized.
When soldering larger pieces requiring a torch then it is about clamping the pieces together so that they can not move then applying the heat as precisely and quickly as possible especially if working with complex, multi piece structures.
The type of solder also affects the outcome! Silver based for structural components that "might" be stressed. Softer solder for pieces that will not be affected by stress.
Electrical connections should be made with a thin, rosin core solder using the smallest about of heat possible. Wicking of wire should be avoided and completed joints clean with a alcohol based solvent. You "should" have a soldering station that allows for temperature control. Smaller connections needing less heat that larger connections. If you are exclusively soldering smaller gauge wire then a constant temp iron will do.
First and foremost ALL surfaces need to be CLEAN regardless of the type of soldering you are doing.
I know it sounds expensive and complicated...after we are not going to the Moon. However we expect or "toys" to do as we command when we command. So, it is like going to the Moon after all!
Barry
I do a lot of soldering
