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Re: DE - on welding / Professor 

By: monkeytrots in POPE IV | Recommend this post (1)
Mon, 09 Oct 17 5:54 AM | 58 view(s)
Boardmark this board | POPES NEW and Improved Real Board 		Msg. 36396 of 47202
(This msg. is a reply to 36392 by micro)
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On brazing jobs that fail - 99.99% of the time, it's cuz the welder failed to braze properly.

One does NOT melt the brass with the flame ... EVER.
One uses the heat from the base metal to melt the brass. It is the mistake that is most commonly, and easily, made. Gotta git it dull cherry red, every single time. *s*

Brazing is soldering - same principle applies with lead solder joints. Ya git a 'cold solder' joint which fails, electrically insulates or doesn't work - every single time one uses the soldering iron to melt the solder, rather than heating the junction, and letting the base metal melt the solder.




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The above is a reply to the following message:
Re: DE - on welding / Professor
By: micro in POPE IV
Mon, 09 Oct 17 5:05 AM 		Msg. 36392 of 47202

Professor

We always used nitrogen. Just a better gas all around. Keeping the welded area as cool as possible. A good point.

High carbon content is always best served with Mig welding and set the current a little lower so you don't generate quite as much heat but definitely have nitrogen.

Problem with brazing is that it really requires very close attention to what one is doing and can be very difficult to get a good strong, durable weld bond between the surfaces... The penetration from a ROD is better imo.

One simply needs to know what they are dealing with in castings. Is it gray iron or something else? Once determined, then select the appropriate welding rods....

Never had a problem...

HAVE had some brazing jobs that did not last though....

Best done on carbon steel.

A lot to learn about all the areas of welding.... Takes years to get really familiar and good with it too.

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