Thanks, maybe I should ask around then. Laser welding would be ideal because any type of solder will be more prone to corrosion. Thanks for the advice.
If I can’t find a laser welding place, I think I would use this stuff. Airgas - RAD64001776 - RADNOR™ 3/64" Stay Brite® Rosin Core Silver Solder And Wire Kit 0.100 lb With 1/2 Ounce Stay Clean® Liquid Soldering Flux (Prices are subject to change without notice due to raw materials cost volatility)