Proper soldering temperature

[beatgr]

I missed earlier posts in 2008 about soldering problems.

1. Temperature controlled sodlering irons and stations REQUIRE a temperature feedback system (ovens have an internal thermocouple to turn off the heat when the set temperature is reached).
2. Placing a light dimmer or variac does NOT achieve true temperature control (think electric stove top burner -- no idea of actual temperature).

The blackening of the soldering tip -- very common with cheap line-voltage (120VAC) stock soldering irons -- iron is overheating.

IF you have a Weller TCP series (WTCP to WTCPL to WTCPT models) then the temperature is detemrined by the ferrous alloy slug at base of tip. This works with the magnetic switch (Magnistat) via the Curie effect !
The WES51 and WESD51 are nice entry level adjustable units -- if you are going to be working with a variety of solder alloys (lead, no-lead, etc.)
Bouncing between no-led and leaded repair work is a NO-NO for RoHS compliance ... so many shops have moved to all no-leaded operations.

700 degrees works best on your analog or digital dial (7 stamped in base for Weller PT tips). This works well for 63/37 and 60/40 leaded solder (Kester 44).
The other aspect often overlooked is to have the correct tip size and profile for the work that you are performing.

For Shannon PC board the 1/16" screwdriver tips work very well (Weller PTA-7 or ETA depending on your station). For the Point to Point work (Weller PTB-7 or ETB) gives you a 3/32" screwdriver tip for some additonal mass to prompt heating of the wires and lugs.

Greg
Elmhurst, IL