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boiler making

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Philip Burley01/09/2019 10:40:14
140 forum posts
3 photos

When soldering boiler components together I understand that I must leave space for the silver solder to run . Thing is , how much space ? tubes a push fit , slack fit ? End plates the same ? You cant measure the gap round a 5/16 tube When I worked in saw mills we jointed wide bandsaws with silver solder strip , but clamped the blade scarf joint very tightly together . A guide would be appreciated

Regards Phil

3404601/09/2019 10:51:56
926 forum posts
6 photos

I use this chart.

Solder Temperature Joint gap Comments
Easy Flo 608-617 .001” Universal general purpose solder very free flowing contains cadmium. Lowest temperature. Very small fillets.
Silver Flo 55 630-660 .001” Cadmium free solder nearest to EF2, free flowing, produces modest fillets ideal for fabrication.
Silver Flo 24 740-800 .001-.002 High temperature used as first step in step soldering. Larger fillets for copper to copper & steel
Silver Flo 40 650-710 .001-.010 Modest fillets as SF55

Edited By 34046 on 01/09/2019 10:53:05

3404601/09/2019 10:56:11
926 forum posts
6 photos

Comments seem to have been cut off for some reason

You will find all the comments on the Polly Models site


Brian John01/09/2019 11:01:37
1454 forum posts
579 photos

.001'' gap : would you describe that as ''push fit'' ?

Dave Halford01/09/2019 11:11:56
527 forum posts
4 photos

Some people use spot punch marks to give clearance

Philip Burley01/09/2019 12:56:16
140 forum posts
3 photos

Thanks . that Polly site is useful

duncan webster02/09/2019 10:49:10
2296 forum posts
33 photos

See also this from CuP alloys


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