Prepare cylindrical ingot of lead-free solder by Bring cylindrical lead free solder to crucible (ครูซิเบิล) which is graphite (กราไฟต์) and melt lead free solder with melting temperature of 179 celsius. To made cylindrical ingot of lead-free solder with diameter of 6.5 mm. and thickness of 1.6 mm by a mold that is created.