Flux for soft-soldering stainless steel

Flux for soft-soldering stainless steel

This topic has 9 replies, 5 voices, and was last updated 24 May 2021 at 13:50 by Keith Hale.

Viewing 10 posts - 1 through 10 (of 10 total)

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22 May 2021 at 18:19 #546387
Hillclimber
Participant
@hillclimber
Can anyone recommend an easily accessible (ie no chemistry set required) flux that will allow me to soft-solder stainless steel?

Before you ask, I have to shorten some multi-strand stainless steel control cables of about 1.6mm overall diameter. I normally 'flash' these cables with a TIG welder, which prevents them turning into feather dusters at the end. But I am working today with some very flexible cables with particularly fine strands, which leave me with odd strands peeling out. Hence, prefer to solder these and then cut.

Cheers, Colin
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22 May 2021 at 18:19 #10846
Hillclimber
Participant
@hillclimber
22 May 2021 at 18:31 #546390
JasonB
Moderator
@jasonb
Delivery costs are a bit of a killer but this does the job
22 May 2021 at 19:21 #546404
MichaelR
Participant
@michaelr
Phosphoric Acid based flux Here
22 May 2021 at 20:26 #546419
Speedy Builder5
Participant
@speedybuilder5
Many off the shelf "rust killers" are phosphoric acid based and will work
23 May 2021 at 08:13 #546455
Keith Hale
Participant
@keithhale68713
Hi Colin

Jason is on the right track.

You can avoid the "killer delivery costs" by buying their stainless steel soft solder 2207 with a suitable flux core. Buy as much or as little as you need. The product can be sent through the post. Normal postal charges apply.

You also get an excellent colour match to the steel.

Why is it called 2207? One of my daughters was born 22nd July 😄

Keith
23 May 2021 at 12:39 #546519
Hillclimber
Participant
@hillclimber
Chaps, thank you all for that help.

Keith's combination of ideas wins out for this small job. But I realise that it's 'an inside job'….!

Cheers, Colin
23 May 2021 at 19:32 #546649
Keith Hale
Participant
@keithhale68713
Hi "Hillclimber"

" Inside job?"

Please elaborate.

Delighted (?) that you were able to find the answer to your situation.

Keith
24 May 2021 at 13:12 #546804
Hillclimber
Participant
@hillclimber
Keith, I was scratching around other soldering posts after placing my initial query here. And realised how much you contribute to the sum of knowledge on that subject here.

You totally nailed it for me (or at least created a low-temperature, bonded metal-alloy joint), as I was quite unaware of these cored specialist solders. Thanks again.

Cheers, Colin
24 May 2021 at 13:50 #546813
Keith Hale
Participant
@keithhale68713
Hi Colin

Thank you for your comments. I am pleased that I was able to help. Any time 😀

Keith
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