Not compression. Tapered seat.Keep line pushed in as you tighten and don't overtighten. No welding, it has a compression fitting to seal it.
Me neither maybe its just the way they packed it. You would end up with allot of coils.Never seen a kit with soldered ends before.
Look at the picture. The line is pre-terminated. There is no compression ferrule.Yes compression fitting. It compresses on the line and doesn't come off.
You cut the line to length. Put the nut on the line, put the ferrule on the line and both it together.