Weller Solder Solder, lead-free 615726 - Weller T0051402499, The Weller T0051402499 soldering wire is a lead-free option with a composition of Sn3,0Ag0,5Cu, weighing 100 g and having a diameter of 1 mm. This solder is ideal for environmentally-friendly electronic soldering applications. Weller's reliable solder ensures strong, conductive joints for various electronic components. Weller T0051402499 Solder Lead-Free Sn30Ag05Cu 100g 1mm Reel