Soldering Iron Temperature

Discussion in 'Homebrew and Kit Projects' started by KD2NOM, Jan 11, 2018.

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  1. KD2NOM

    KD2NOM XML Subscriber QRZ Page

    Wow - so the Kester solder I have is SN60PB40 which according to the charts it has a Solidus of 183 degrees C and a Liquidus of 238 degrees C - I am going to test soldering at these lower temps.
  2. W9GB

    W9GB Ham Member QRZ Page

    Kerry thanks for that Micron solder station (AU) adaptation.
    Here is another Micron adventure.

    Hakko 926 (discontinued when Hakko 936 introduced in early 1990s)
    Used a ceramic heater.
    Only Ungar (California) was using ceramic heaters before Hakko adopted in the 926 design.

    D996030F-97AA-4ED8-903A-8CE669121306.jpeg 10556178-551B-4FF9-A2ED-32E3639D124F.gif

    Sorny Roong (Solomon) SR-976
    Solomon's clone of the 25 year old Hakko 926 design, they flipped (mirror imaged controls).

    Micron T-2090 (ceramic heater)
    Looks like an OEM privare label from Solomon.
    B3B94DDC-42CD-4510-BD29-DB0A97A34FE3.jpeg 28BF69B9-D9B7-432C-8134-310AB3393F97.jpeg
    Last edited: Jan 13, 2018
  3. W9GB

    W9GB Ham Member QRZ Page

    REMEMBER that the Electrical Component Leads are “heat sinks” that must be raised to 183° C
    for the solder to flow ... AND you DO NOT desire to “loiter” on those leads (damage component).
  4. KD2NOM

    KD2NOM XML Subscriber QRZ Page

    RRR - I was practicing and noticed that I still get very good flow and joints around 310-350 C
  5. WA7PRC

    WA7PRC Ham Member QRZ Page

    Sn63/Pb37 is eutectic. There's an extensive list of alloys here:
  6. W9GB

    W9GB Ham Member QRZ Page

    NO, you mis-read the Solder Alloy Chart. Base/Alloy Properties.pdf?ver=2016-08-05-104108-977

    Pure Tin (100% Sn) : 232° C (450° F)
    Pure Lead (100% Pb) : 327° C (621° F)
    Tin (Sn) / Lead (Pb) solders.

    63 / 37 : Tin/Lead Eutectic - 183° C (361° F)

    60 / 40 : 183° C Solid, 191° C Liquid. Plastic State: 183-191° C (361-376° F)
    ANY movement of joint or component during plastic state results in cold (bad) solder joint.
  7. W9GB

    W9GB Ham Member QRZ Page

    310 to 350° C : (590 to 660° F)
    The solder joints, on your kits and PC boards are small mass, quickly heated.
    That temperature range is at the “low end” for 63/37 and 60/40 tin-lead solders.

    Results change, when you moved to point-to-point wiring (larger joint mass) —
    such as toggle switches, terminal strips, and “FP” style electrolytic capacitors.
    In those cases, a larger mass tip 3/32” (0.93 inch or 2.38 mm) helps for better heat transfer.

    The typical temperature range, used on adjustable solder stations by commercial industry,
    for “General Rework” with Tin / Lead solders: 340 to 370° C (650 to 700° F).

    As Bryan has noted ... the Solder Tip MASS (Profile and Width) are the MORE Important adjustments — once you set the Correct Temperature Range for the Solder Alloy.
    Last edited: Jan 13, 2018
  8. KD2NOM

    KD2NOM XML Subscriber QRZ Page

    Thank you again for the clarification - I actually read it write and wrote it down wrong - derp!
  9. VK2TIL

    VK2TIL Ham Member QRZ Page

    Kerry thanks for that Micron solder station (AU) adaptation.

    G'day Greg.

    My Micron was purchased about 1982 as well as I can remember; it is therefore about 35 years old. I've thought occasionally about getting a new station but this one is like that pair of old slippers, worn but comfortable.

    It has done a zillion joints, from 0402 SMD (under the microscope) to copper & brass sheet, nuts and the like.


    I'm fairly sure that it was made in Japan, although there is no sticker on it; perhaps there was never a sticker or perhaps it has fallen-off.

    The photo is of the "hot" end of the bench; visible are a waterbottle for the sponge, a tip-holder, a Micron de-soldering gun, the inevitable & ubiquitous 40-watt Weller (older than the Micron) and a small heat-gun (the blueish-purple object on its hook on the right behind the Weller).

    Under the bench is a box with soldering paraphernalia, including a few spare tips of the el-cheapo ebay kind;


    (There are more in the store-room in case I run low).

    I have other soldering gear; a 200-watter, a Portasol gas-torch iron and a Scope (not sold in the US) with both small & large handpieces. Only the Portasol sees occasional use these days.
  10. SM0XHJ

    SM0XHJ Ham Member QRZ Page

    Wow! That's a lot of soldering tips :)

    I can really recommend brass wool instead of a sponge with water. Water leads to oxidation and wear on the tip.
    G4COE likes this.

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