Soft soldering aluminised tube ?

[Tim StevensParticipant @timstevens64731]

What preparation, what flux?

[Tim StevensParticipant @timstevens64731]

I need to solder a new tube into a vehicle cooling system – steel tube soft soldered into a brass angle-piece. My client has obtained aluminised tube (exhaust) which is the right size and shape, but will it solder, and if so, how?

The overlap of tube to boss is about 25mm (one inch).

Thanks in advance for your advice

Regards, Tim

[Dave HalfordParticipant @davehalford22513]

I would remove the plating in the joint area and fully tin the area before assembly.

[Keith HaleParticipant @keithhale68713]

Hi Tim

Simply use a liquid soft soldering flux SPECIFICALLY for aluminium. Follow this with 60/40 tin/lead solder.

Or you could adopt a cheaper option of using a soft solder wire with a flux core suitable for aluminium. It's cheaper because you're buying less flux and in a form that can be sent through the post at minimum cost.

You know where to find both items!🤔

What puzzles me is why you didn't ring them in the first place. One phone call and you get the advice and materials.

Best wishes

Keith

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