... Original factory manufacturing solder bar with little drosspot produced, with full light spot after dip soldering. TC Solder bars:TC solder bars are produced ... drosspot produced, with full light spot after dip soldering.Normal solder bar types and usages: Sn / PbProportionLiquidus temperatureWorkingtemperatureUsage63 / 3760 /408. ... , Bulb, Art work, Water tank, Aluminum pipe welding, etc. Solder bar