Regards, Steve
[EMAIL PROTECTED] wrote:
At 03:43 PM 7/10/03 -0700, you wrote:
Harry, would it be more correct to say that you were trying to break the
surface tension of the molten solder blob in order to make it run along the joint?
Theoretically solders won't flow, or rather wet, because the flux has broken down or was inadequate to begin with or a contaminate, usually an oxide of some sort, has formed on the target surfaces. The idea of scratching is to attempt to remove or at least displace some of that oxide in order to encourage the solder to stick. The failure of scratching in silver soldering is due to the high temps involved and the quick formation of hard oxides or burnt contaminates. Another hopeless non-starter is attempting to add a fluid flux to a joint at brazing temp.
Regards, Harry
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