Not sure why they did that, weight saving possibly, or eliminating a possible toxic contaminant from the spacecraft. Instead, the wires were bonded to components by spot-welding. I should note that the Apollo Guidance Computer was built without solder or flux. Vapor from 'no-clean' fluxes is worse than rosin types. MORE: different fluxes have different toxicity. To answer your second question, most mild acids can be used for flux, but that doesn’t make them any better than rosin (in fact they're probably more harsh.) For example, when I did Tiffany-style stained glass I often used oxalic acid for flux, that wasn’t so great to breathe either. Even leaded solder is fairly safe, just wash your hands afterward.Īs far as flux, rosin vaporizes when it’s heated and it’s not so great to breathe, use ventilation to draw it away. Why bother, anyway? Lead-free solder is widely available (it’s mandatory for plumbing), so working with it poses no health risk other than the flux fumes. Silver can be used for flame brazing though. Same story for silver: melting point for the unalloyed metal is too high for soldering. Solder is a tin-lead alloy or tin-silver-copper alloy for lead-free. For one thing, pure lead melts at too high a temperature. If you were thinking about an object with lead to be recycled for solder, don’t. Solder is an alloy that melts at a low enough temperature that it doesn’t damage components when it’s applied, and it adheres well to copper and brass (hence its use in plumbing.) For normal types of electronics work, not really.
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