Weller WSM 1 Soldering Station — A short review

Summer is finally over it seems. Yesterday was the first noticeably colder and terribly rainy day and I have a feeling in my gut that I’m already incubating a nasty cold. I got soaked again while riding my bike back home to get into bed early. Yeah, I’ve got extra bikers gear to fend off the rain, but there’s always a place where the water and the cold find a way to creep in, with all the wind blowing from everywhere at once and whatnot. I’m dreading the dark winter hours… last year was just horrible. I could never live in northern countries with 6 months of permanent twilight and all the snow and ice. Shudder.

And now for something completely different:

I’ve used my trusty “ERSA TIP 260” soldering iron for the last 15 years or so, and I’ve never had to replace the tip. It’s still as shiny as on the first day. Yes, I do treat it well.

Now I’ve made the step and have finally bought a more advanced piece of equipment, namely the “WELLER WSM 1” soldering station. I didn’t go for the one with the additional battery pack, as I don’t plan to do any ‘wireless’ soldering in the field. Some 60 bucks well ‘not-spent’. I had looked at the WD1 as well, but I didn’t feel like spending close to 500 monetary units. It was bad enough that I had to wait almost two full weeks until it got delivered. I gave the shop a call and was told that ‘somebody’ (I curse you, do you hear me!?! One day of vastly accelerated bowel movements to you!) was on a shopping spree and emptied their stock completely.

The main impetus to get it was, and still is, the horrible trouble I have with soldering SMD RGB LEDs coming in a PLCC-6 5050 package.

PLCC6-5050_RGB_LED_OK

The plastic just melts way too easily. My TIP 260 is set to a fixed temperature of 350°C and melts the package like a hot knife cuts through butter.

PLCC6-5050_RGB_LED_DEAD

The WSM 1 can be adjusted from 100°C to 400°C and packs a whoppin’ 40Watt heating element into the RT 3 tip. That way I can be sure I’ll be able to find the correct temperature for the job. As the heating element is in the tip itself, there’s not much thermal inertia and everything should work perfectly. The WSM 1 can quickly adjust for the energy/temperature loss in the tip due to melting of solder. My old TIP 260 works with a PTC heating element and sometimes it takes a while until it reacts to a drop in tip temperature when melting a big blob of solder. This is now a thing of the past. Nevertheless I will not abandon it and keep it for odd jobs that don’t require advanced soldering tools. One advantage of it is that it fits into the storage containers I use.

It comes with these parts: 12V, 50W switching power supply (no power switch), main unit (no power switch, GND plug), soldering pencil, soldering tip, soldering stand with brass cleaner. As the WSM 1 doesn’t come with a power switch (the WSM 1C has it, it also comes with a battery for portable soldering but it also costs 60 bucks more), you’ll want to watch standby power consumption. I’ve measured it with one of these ‘kill-a-watt’ like devices and it’s about 0.5W, which is tolerable. Nevertheless I switch off all of my gear with a master switch anyway. A switch in the main units wouldn’t do much good anyway, as the 0.5W standby loss is caused by the switching power supply itself. Fortunately the main unit starts up in OFF mode by default. No chance of accidental fires after a power loss.

The soldering pencil is very light and its cord is very flexible, what a joy. One of the most outstanding features of this soldering station is the extremely short heat-up and cool-down time, as well as temperature stability. It takes about 4 seconds to go from ambient temperature to 400°C!

The user interface consists of a big LC display and 2 touch sensor buttons labeled “-” and “+”. By pressing “+” or “-” shortly, you can quickly switch between two adjustable temperature setpoints. I use Sn60Pb40 solder and 240° for sensitive parts and 280°C for bigger ones with more copper. Pressing the buttons longer increases or decreases the temperature. With no buttons pressed the display switches back and displays actual temperature. Pressing both buttons for some time switches through the settings menu. You can adjust a standby temperature (called setback) and the associated timeout, the power off timeout, a global temperature offset and a lock code. It’s very easy to use and the manual only consists of a few pages. Standby mode and auto power off are only triggered if the soldering pencil rests in its stand. If in standby mode the iron is instantly reheated as soon as you pick it up again.

weller_WSM1

Although it cost me A LOT, I give it a big thumbs up. Even if you don’t want to pay as much for a soldering station and are serious about electronics as a hobby, try getting a decent soldering station yourself. Not having to use 350°C for everything is sooo nice. Less burning of flux on the tip, less thermal stress for sensitive SMD parts, less oxidation of the tip and therefore less cleaning is needed :-)

This entry was posted in Electronics., Soldering & PCBs. and tagged , , , . Bookmark the permalink.

11 Responses to Weller WSM 1 Soldering Station — A short review

  1. Raj says:

    You mean WSM1 and not WMS as stated??

  2. robert says:

    Oh, you’re correct.

    It’s ‘WSM 1″ of course. I’ve corrected it.

  3. Pingback: Electronics-Lab.com Blog » Blog Archive » Weller WSM 1 Soldering Station — A short review

  4. Eduardo says:

    Ok,

    Now do take it appart and show us pictures of it’s power supply, or even better write it down with your preferred shematics’ capture software, or something…

    Just to make of this a propper review other than “it was expensive but works as expected”

  5. robert says:

    Power supply… it runs with a typical laptop power supply (12V, 5A).

  6. Hey Robert,

    I’ve became aware of soldering pencils in general and the WSM 1 in specific after watching your Therapeutic Soldering series on YouTube.

    Being the lead developer of Ultimate Hacking Keyboard I have to properly prototype it’s LED display featuring lots of super-tightly placed 0603 LEDs.

    So far I haven’t been able to solder these LEDs with the precision that is needed, not even with my home-made reflow oven – For some reason the LEDs always tilt towards one direction or another during the reflow process instead of laying flat on the board. I also tried to solder the LEDs with my (quite average quality) iron without success. The whole iron and its tip seemed to be too bulky.

    It seems to me that a soldering pencil could do the job. It seems to be a very delicate equipment that is optimally suited for this kind of work. Do you think that the above display could be soldered with the WSM 1 without any hassle?

    I’m thinking about buying one but the price is quite discouraging despite the excellent quality. I’d also be interested about what alternatives exist besides the WSM 1 and what can they offer.

    Cheers!
    Laci

    • ResR says:

      Hey Lazlo.
      Have you tried to glue the LED’s onto PCB before reflow process? I have seen in commercial application where SMD parts are glued onto PCB (even in CFL’s) – it’s a little hassle to desolder these though.

      • Hey ResR,

        Thanks for the idea! Haven’t tried to glue the LEDs onto the PCB. That might have worked, I guess. Luckily, I don’t have to deal with that issue anymore because a custom LED display will be manufactured for that purpose.

  7. robert says:

    Yes, the WSM1 is quite costly. And so are the replacement tips.

    It is really nice to have and the soldering pencil is nice and small, but I don’t think you absolutely need something like it do to the job. But yes, it would probably make it a bit easier. “No hassle” – I don’t know. Its small size certainly makes it ideal for small stuff in tight spaces. I don’t know what iron you use, but I think it is more important to get a tip of the right size and enough flux. From my personal experience a 2mm chisel-tip is suitable for most jobs involving SMD parts.

    Maybe something like a Hakko 888 (or clone) would be a more affordable upgrade. They certainly have a wide variety of tips available.

    Regarding the resistors going into tombstone-mode when reflowing: you may be applying a bit too much solder paste on one side.

  8. My soldering station loosely resembles the Hakko 888 by the looks of the iron. I’ll try to use a different tip and also thinking about making an already existing chisel tip sharper with my Dremel.

    The LEDs are not exactly tombstoning (towards one end or the other), but tilting towards one side or the other). This makes them connect to the board bot they’re loosely oriented. Regardless of what exactly happens this may be very well due to too much solder paste.

    Given the amount of suckage with my reflow oven I’ll certainly try to solder the LEDs this time. Your videos are certainly more than encouraging so I’m gonna give it a try. :)

    As a non-related issue I’ve subscribed to the comments of this post and I’ve just noticed that the notification mail landed in my spam folder. Maybe something like Mailgun for WordPress could solve this pain.

    Thanks a lot!

  9. Sasha says:

    350 degrees are too much. I solder SMD parts on 270 degrees, or even 250. No more than 300 on PCB’s with small traces.
    I use 350 degrees only if I solder something large that sinks heat very fast.

Comments are closed.