popspipes has good advice.
Since you want to keep temperature low, I will offer this.
At a job many years ago, we needed to make electrical
connections to a 1/4" x .020 wall 316 stainless tube.
Wire was 18 gauge stranded tin-plated copper with teflon TFE insulation.
Used Blitz flux and plain 60/40 tin/lead solder with a 40 watt soldering iron.
All joints needed to be cleaned very well after soldering as the flux is very corrosive.
But we made all good joints using this flux.
Today lead is a no-no so I tried a few tests using my 5% Ag - 95% Sn
solder and the results were the same.
440 stainless contains chromium which forms an oxide which makes soldering tough.
The right flux makes all the difference.
Plus - clean - clean - clean
I have included info on the flux.
Force Industries Division
American Solder and Flux Co., Inc.
28 Industrial Boulevard
Paoli, PA 19301-0947
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12-04-2013, 02:13 PM #11Senior Member
Thermal Arc GTSW400, Airco Heliwelder II, Miller Dynasty 350, Hypertherm 1000, oxy-fuel setup, metal cutting bandsaw, air compressor, drill press, etc.:
- Join Date
- Dec 2007
Call me the "Clouseau" of welding !