For maximum performance, pick a tip geometry which will maximize contact with the connection. A flat, blunt tip will transfer more heat than a fine, pointed one. Choosing the largest tip possible will improve performance (enabling you to conduct more heat at lower temperatures), and enhance tip life. Each Metcal tip cartridge is designed for high power delivery, so you can often solder 100°F lower than with a conventional iron. For most applications, a 600°F tip cartridge will provide enough power and flexibility to do the job. Switch to a 700°F only where absolutely necessary; for example, when working with heavy ground planes.

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The description and image shown may not be not that of the actual part number SSC-638A. More.