11. Filler metal is added manually to the front end of the weld pool as it is needed.12. This soldering tip can melt solder filler metals as acoustic vibrations are induced in the molten solder pool. 13. Brazing filler metal is stronger than silver solder, which is stronger than lead-based soft solder. 14. Soft solder filler metals are typically alloys ( often containing lead ) that have liquidus temperatures below 350 �C. 15. Filler metal ( electrode material ) improperly chosen for the environmental conditions can make them corrosion-sensitive as well.16. The parts have to be perfectly machined, or pressed together, due to the small volume of filler metal . 17. This is an electrode that conducts electricity to the arc but also melts into the weld as a filler metal . 18. The filler metal reacts metallurgically with the workpiece ( s ) and solidifies in the capillary, forming a strong joint. 19. Filler metals are also used in nearly all applications of GTAW, the major exception being the welding of thin materials.20. The alloy of the filler metal for each type of soldering can be adjusted to modify the melting temperature of the filler.
