A Comprehensive Guide to Soldering: Mastering Techniques and Tools with the Learn to Solder Kit

Introduction: The Art of Soldering

Whether you're a DIY enthusiast, an aspiring electronics hobbyist, or someone looking to repair household electronics, mastering the art of soldering is an essential skill. This comprehensive guide will equip you with everything you need to know about soldering, from understanding the components of a soldering kit to mastering essential techniques.

The Learn to Solder Kit: Your Gateway to Electronics

Our through-hole Simon Says Kit is a great beginner's kit and also a pretty fun toy. All components are through-hole, making this kit a great place to start when you're learning to solder. The Learn to Solder version of the Simon Says Kit includes everything that the original kit does as well as the basic soldering tools you need to put it together! This is a great kit for anyone just learning to solder or teaching someone to solder.

After you have successfully assembled the kit, you will have a greater knowledge of through-hole soldering and the tools, techniques, and terminology required to populate your own PCB prototype. You will have a development platform with 5 outputs (LEDs and buzzer), 5 inputs (buttons), and serial for debugging. Checkout the assembly instructions - we're pretty proud of them. The kit even includes batteries!

Essential Soldering Tools and Equipment

To get things started, we’re going to need a few specialty tools. Don’t worry, you don’t have to break the bank to get everything you’ll need. Here's a breakdown of the essential components:

The Soldering Iron: Your Primary Tool

The soldering iron is your main tool in soldering. Soldering irons can reach temperatures in excess of 400 °C (800 °F) so you’ll want to avoid contact with the skin and consider any fire hazards in the area.

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Solder: The Bonding Agent

There are several solder options on the market, but they are broadly categorized into lead-free and leaded solder.

Lead-based solder: flows easier, lower soldering temperature of 600°-650°F (316°-343°C), carcinogenic!
Lead-free solder: a little harder to work with, but safer for human health, higher soldering temperature of 650°-700°F (343°-371°C).

Leaded solder is easier to work with due to its fixed lower melting point and easier flow, but requires additional precautions due to the presence of toxic lead. I generally prefer working with lead-free solder for the safety concerns around lead-based products. If working with leaded solder, please ensure you don’t eat or drink at the same time and wash your hands after soldering.

Flux: The Oxidation Fighter

Solder used for electronics is actually a hollow metal tube filled with a substance called flux, also referred to as a rosin core. Flux is a material that improves the solder flow and adhesion by reducing oxidation. Without flux the solder would oxidize rapidly, not flow efficiently, and result in poorer joints. It’s a super important ingredient in all electronic solder! Flux helps to remove oxidation from the contacts and ensures strong bond between the solder and whatever you’re soldering.

Some people will say you also need to add extra flux paste to the wires but honestly this is a redundant step, with the right technique there’s already more than enough flux in the solder to make effective connections. Anyone that insists you use extra flux has spent too long soldering copper pipes together. Don’t underestimate the importance of flux!

Cleaning Supplies: Maintaining a Clean Tip

Grab a damp cellulose sponge or soldering tip cleaner to clean the iron tip.

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Fume Extraction: Protecting Your Health

A fume extractor or some method of fume removal on hand is essential. Last but not least, consider ventilation and fume extraction very carefully. While soldering, you may be exposed to toxic chemicals which can cause anything from moderate to severe health issues with prolonged exposure. Industrial fume extractors can cost thousands of dollars, but those are overkill for the average hobbyist.

Additional Helpful Tools

However there are a few additional tools that are beneficial in optimizing your workflow. Below is a list of my personal recommendations (that I own and use).

Automatic Wire Strippers: When stripping wires I can’t recommend any other tool other than automatic wire strippers.

Creating a Safe Work Area

This might seem like an imposing list of tools, but there are budget-friendly options for the DIY repair enthusiast. We’ve also bundled everything you need to get started into the portable FixHub Soldering Toolkit. While soldering can be intimidating, it’s pretty safe so long as we take proper precautions. On rare occasions, you’ll see solder ball up into tiny globules and jump from the tip of your iron. This should also incentivize you to create a suitable work area for your soldering projects. Hard wooden surfaces are ideal, especially when paired with a silicone work mat.

Preparing Wires for Soldering

Stripping Wires

Start by using the tool to expose about one inch of material on 2 pieces of wire.

Twisting the Strands

Wires are made of multiple, thin strands, we want to start by twisting these strands into a single core. Ensure they're tightly twisted to prevent weak joints and that there are no loose wires sticking up that may later puncture through insulation after soldering.

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Splicing Wires Together

While you could solder by laying two wires parallel, on-top of each other, there will be a small air gap between them and we will be relying entirely on the solder to hold them together. This isn’t the strongest connection, instead we want to twist the wires around each other. There are 2 methods to achieve this, as shown below.

X-Shape Twist

Cross the stripped wires creating an x-shape. Use your two index fingers to twist the ends around each other, ensuring snug wraps.

V-Shaped Twist

Pinch the end of one stripped wire at the base of the insulation of the other wire, creating a v-shape. Using your free hand, twist the two wires around each other.

Ultimately the method you use is a personal preference, so I encourage you to try them both. There are three steps to ensuring a good spliced wire connection:

Are the wires twisted end to end? You don’t want untwisted sections or unequal cable lengths.
Are the wires laying flat? You don’t want any strands sticking that could later puncture through insulation.
Is it a snug fit? You should be able to apply a little bit of tension without it coming apart.

Maintaining a Clean Soldering Iron

Now that the wires are prepared, we can solder! But first and foremost we need to ensure we maintain a clean tip. Without regular cleaning, the tip will begin corroding and it will be ineffectual at transferring heat onto our wires. Soldering iron tips have an iron plating that’s great for outputting heat, but they are prone to oxidation and corrosion.

The Cleaning Process

Without regular cleaning excess solder builds up, the tip oxidizes, and corrodes. Once this occurs it will be a lot harder to effectively heat up a surface and solder. To prevent this, I clean the tip when I first turn on the soldering iron, then every couple of minutes while working, and once more before turning the machine off.

The cleaning process involves applying fresh solder to both sides of the soldering iron (known as tinning) then lightly brushing off the excess solder in a brass sponge. Don’t be too aggressive when brushing off excess solder as you can flick hot, molten solder toward your face. You may choose to wear safety glasses. After cleaning, the tip should come out smooth and shiny.

An alternative to brushing off in brass sponge is using a damp paper towel or sponge, but I personally don’t like this method as it’s a hassle to go wet, it drops the surface temperature of the tip, and if the sponge is too dry it will melt onto the tool, making an even bigger mess to clean up. Additionally, while you could use regular water, it would be better to use distilled water without the additional minerals found in tap water. All round, it's more hassle than a simple brass sponge.

For more aggressive cleaning, you can plunge the hot tip directly into tip tinner, this will really help strip away the excess build up of material and oxidation. However, this is overkill in all but the most extreme cases and you will probably want a fume extractor running.

Whatever you do, never ever use steel wool or a metal file to clean off the tip of the iron. I have seen some videos on YouTube recommending this but they are both too abrasive and will destroy the protective coating on the tip of the iron leading to an even faster deterioration.

Common Soldering Mistakes (and How to Avoid Them)

It’s easy to make a bad solder joint. So easy that I actually want to teach you the wrong method first, so that we can see what to correct through proper soldering technique.

The incorrect method is as follows:

Apply a substantial ball of solder to the tip of the iron
Wait several seconds as smoke is released from the solder on the iron (this is the flux evaporating away)
Then attempt to paint the solder onto cold wires, depositing small, heaped balls on the surface.

Looking at the image above, it is fairly intuitive that this is a bad solder joint. But what exactly was wrong with this and what are the steps we can take to ensure proper soldering technique?

The first issue was that all the smoke being released while solder sits on the tip of the iron is the flux evaporating. And recall, the entire reason we use flux is to help the solder flow and reduce solder oxidation. It’s not very useful if it all evaporates before we even get to our work surface. Instead of using stale solder that has been sitting on the tip of the iron, we always want to use fresh solder, full of flux, ready to flow.

And the second issue is that when trying to deposit the solder, it solidified immediately because the wires were way too cold. This is known as a cold solder joint. Instead we want to ensure the wires are hot, before adding fresh solder, so that the solder has time to flow in-between the individual wire strands before solidifying.

The Four Steps to Soldering Success

Good soldering technique is all about maximizing heat transfer to the work surface and then bringing in fresh solder, full of flux, that will easily flow through the target. To achieve this, I am going to give you a checklist of 4 steps to ensure you get consistently good results.

Maximize Contact: Use the flat edge of the iron for a larger surface area contact and better heat transfer, not just the narrow tip. This can be achieved by holding the iron at a shallow angle but not so much that I accidentally melt the insulation.
Stay Stationary: Keep the iron stationary and in the centre of the joint. Apply gentle, firm pressure for effective heat transfer. Don’t try sweeping with the iron because the tip will lose contact as it skips over the wire’s surface. You’re also trying to heat too large of an area all at once. This step is the true secret to effective soldering!
Enhance Heat Transfer: Add a small ball of solder to the tip of the soldering iron. This isn't for direct application to the wires but to improve heat transfer. The liquid solder's surface tension increases surface area contact with the wires, enhancing heat transfer. There are many ways of testing to see if the iron is hot enough, but we recommend feeding some of the solder to the tip. Lead-free solder will melt in the 200-230 °C (390-445 °F) range and allows us to fuse components in place making sure they have a strong electrical connection.
Apply Fresh Solder: After heating the work surface using the above three steps, add fresh solder from the opposite side of the wires to where the soldering tip is. This gives the solder a chance to wick in between the strands of wire instead of pooling on the tip of the iron. Solder will flow towards copper, but copper develops a layer of oxidation when it comes into contact with air. Trying to solder to oxidized copper results in a weak and brittle connection.

Follow these four steps and a good joint is all but guaranteed (I strongly recommend watching the video at the start of this tutorial to see these four steps in action).

As the solder melts, slowly work over the entire length of wires, ensuring complete coverage. Let’s start soldering! Apply your iron to the copper contact on the board and the component pin for a few seconds. The goal is to heat the copper pad and the component pin evenly so they can accept the solder. After heating the contact point, apply the solder.

Inspecting and Insulating Your Work

Once a pair of wires are soldered, I have 4 steps of visually confirming a joint is good:

Solder should wrap all the way around and in between the wire strands.
Solder should be applied upto the edge of the insulation, without melting it. If a section is left exposed it will be extremely flexible and easy to break.
Is there too much solder? If so, remelt it and using a sweeping hook motion, pick the excess solder up with the soldering iron and then brush it off in a brass sponge.
Are there any wire strands sticking up? If so, we want to smooth them over. Ideally we would do this before soldering by ensuring our twists lay flat, but we can still smooth over spikes with patience and a little bit of pressure. For through-hole connections, you’re looking to create a Hershey’s teardrop shape joint.

Once you’re happy with the joint, we will want to protect it from the environment and potential short circuits using a piece of heat shrink tube. I personally find hot air guns to be a little cumbersome, so instead my go to is a lighter. Holding the heat shrink in the blue part of the flame will ensure a clean finish. If you hold it in the orange part of the flame, a layer of soot will be deposited that doesn’t look the prettiest. Sometimes you can’t slide on insulation after soldering, instead pre-load the heat shrink. But be careful, leave it too close while soldering and the tube may prematurely shrink.

Desoldering: Correcting Mistakes

Now that you’ve made your first soldered connection let’s talk about how you can disconnect and remove it. As with soldering, to desolder a joint we need to heat the copper braid and the solder we want to remove evenly. Remember when we mentioned that solder is attracted to copper? Just like magic, the solder flows away from the board and into the copper braid.

Cleaning the Board

Now that we’ve successfully added our solder point, we need to begin cleaning. Flux is corrosive so we’ll want to apply a little isopropyl alcohol to the board and clean the area with a cotton swab.

Practice Makes Perfect

As with everything in life, practice makes perfect. Desoldering can be a frustrating exercise at times. If you find yourself struggling, don’t blame yourself! Soldering isn’t difficult and it’s far more likely that you have a bad iron or you’re working with crappy solder.

Learn to Solder Kits: Expanding Your Knowledge

We sell a variety of electronics kits with varying degrees of difficulty. While these kits are helpful in learning the basics of electronics, there is often a disconnect between understanding a circuit built with colorful snap-together plastic parts and seeing the same circuit made with real electronic parts soldered in place on a circuit board.

Explore a world of Engineering Possibilities With our Learn to Solder Kits you can complete your first soldering project in about 30 minutes. The instructions were very easy to understand. I bought this for my 10 year-old nephew and he was able to comprehend the instructions and even trouble shoot issues that he had. This was cute and fun and really helped me get over my fear of just getting into soldering! Quick and easy and the tutorial online is straightfoward and explains the components in a simplistic way. Excellent kit!! Well organized, great instructions, fun to build-and it works when you’re finished!! These kits are how my nine year-old granddaughter learned to solder. Learn to Solder Kits are made with love in Sacramento, CA. We have different kits for various skill levels. Thanks for buying one of our kits! You can find the instructions for each kit by clicking the button below. Good luck and enjoy assembling your kit!

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