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Acid etching

June 20 2012 at 4:18 PM
Joe  (Login JersyJoe)
HyperScale Forums
from IP address 108.67.105.47


Response to "Acid etch" on P-51's...

Aluminum, like nearly all metals, gains a thin layer of oxidation when exposed to air and moisture. There are many
types of aluminum fluxes but acid is the quickest and surest in a production mode. Aluminum spot welding make oxidation free surface an abolute must or the weld will inferior and fragile. Aluminum requires three times the curent (150 amps) and only one fourth the welding time (.10 sec) as steel. The power requirement for aluminum spot welders can be very expensive unless capacitor induction macines are used in thye production mode.
After a period of time the acid etched or acid fluxed
surfaces regain the oxidation layor.
Aluminum stick (Heliarc) welding must use a helium cloud to keep oxigen out of the welds. Heliarc welding for aluminum also require more curent and les time.
Even though it costs more, it is the weight of the steel alternative that makes aluminum and aluminum welding a necessity.
Joe

 
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