Mercedes Mullins
Soldering a fitting to a fuel tank is possible but challenging. It is important to ensure that the metal is clean and hot enough to melt the solder, which requires a significant amount of heat if the tank contains water. Acid core solder can cause issues by making the surface dirty, and a naked flame can be dangerous. Silver solder requires very high temperatures, and regular plumbing solder may not work on certain metals. Brass fittings can be soldered to a steel tank using brass brazing material, but the result may not be aesthetically pleasing.
Characteristics and Values:
| Characteristics | Values |
|---|---|
| Metals used for soldering | Steel, stainless steel, aluminium, copper, brass |
| Solder type | Silver solder, lead-based solder, acid core solder, tinning flux, sweating flux, lead sticks, brass brazing material |
| Tools | Soldering iron, propane torch |
| Techniques | Welding, brazing, soft soldering |
| Challenges | Ensuring metal is hot enough, preventing oxidation, cleaning the surface, avoiding overheating |
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What You'll Learn
Clean the tank thoroughly before soldering
Before soldering a fitting to a fuel tank, it is crucial to thoroughly clean the tank to ensure a safe and effective procedure. Here are some detailed steps and considerations for cleaning the tank:
Firstly, it is essential to understand the risks involved. Fuel tanks can contain flammable vapors, even after being washed out with water. Purging the tank with exhaust gases or leaving it out in the sun for a few days with the filler cap removed can help eliminate these vapors. It is also crucial to avoid using an open flame for soldering unless the tank has been thoroughly purged and cleaned to prevent explosions.
Next, the physical cleaning process can begin. Start by using a brush or emery cloth to scrub the interior of the tank. This will help remove any residue, rust, or impurities that could interfere with the soldering process. Pay close attention to the areas around the seams and joints, as these areas are more susceptible to leaks and require a clean surface for effective soldering.
After the initial cleaning, consider using an electrolysis tank to further clean and de-rust the fuel tank. This process can effectively remove any remaining rust and ensure a clean metal surface. However, be aware that electrolysis may not be necessary if there is no rust present.
Once the tank is physically clean and free of rust, you may want to apply a tinning flux or a layer of solder paste to the areas that will be soldered. This step will help create a better bond and improve the flow of the solder. Be sure to follow the instructions for the specific type of flux or paste you are using.
Finally, before beginning the soldering process, inspect the tank one more time to ensure that it is thoroughly clean and free of any flammable vapors. Use appropriate personal protective equipment (PPE) during the soldering process to safeguard against any potential hazards. Remember, a clean fuel tank is essential for successful and safe soldering.
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Use a tinning flux, not a sweating flux
When soldering a fuel tank, it is important to use a tinning flux rather than a sweating flux. Tinning flux is a lead-free solder flux that meets all standard solder content regulations and poses no significant health hazard during application. It is an ideal plumbing flux, perfect for joining metal pipes and other metalwork soldering works.
Tinning flux enhances the tinning process, which coats surfaces with tin, and acts against the possible oxidation of metal surfaces during the soldering process. This process is important to remove the oxide layer from the surface and enable the adhesion of two metal surfaces together. The oxide layer inhibits the formation of a strong bond, so using a tinning flux improves the strength of the joint.
Additionally, tinning flux enhances solder flow, which is crucial for creating strong joints. It acts as a soft molten pore filler, filling in and attaching to pits and scratches in the base metal. This is especially important when soldering dissimilar metals, as the tinning flux acts as an intermediate agent that will bond the solder to the flux and the metal.
When using tinning flux, it is important to thoroughly clean the metal surfaces to ensure any foreign matter is removed. This can be done using steel wool until the metal's luster is exposed. Once clean, the tinning flux can be applied via a flux brush, and then the repair piece can be laid over it and soldered.
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Avoid a naked flame, it is extremely dangerous
When soldering a fitting to a fuel tank, it is extremely dangerous to use a naked flame. Here are several reasons why you should avoid it:
Firstly, the process of soldering requires extremely high temperatures, especially if you are using metals such as stainless steel, which requires silver solder and higher temperatures than lead-based solder. A naked flame may not be able to generate sufficient heat, leading to ineffective soldering and weak joints.
Secondly, a naked flame presents a significant safety hazard when working with flammable substances such as fuel. The open flame could easily ignite the fuel vapours, resulting in a fire or explosion. This poses a serious risk of injury or even death.
Additionally, the use of a naked flame can be challenging when trying to access the small spaces within the fuel tank. The confined space and limited room to work, especially at the top of the tank, make it difficult to manipulate the flame accurately and safely. This increases the risk of accidentally damaging the fuel tank or soldering incorrectly.
Furthermore, the stress exerted on the soldered joint during the re-installation of the fuel tank can be significant. A weak joint created by improper soldering or the use of incorrect materials can lead to failure. This could result in fuel leakage, which is not only a fire hazard but also an environmental concern.
Finally, different metals require specific types of solder. For instance, soldering aluminium tubing to a sheet metal plate is known to be challenging and requires specialised knowledge. Using a naked flame without the correct solder could result in a failed joint or damage to the metals being joined. Therefore, it is crucial to understand the properties of the metals involved and select the appropriate soldering materials and techniques.
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Ensure the metal is hot enough to melt the solder
To ensure the metal is hot enough to melt the solder, the right temperature setting is crucial. The ideal temperature will depend on the type of solder you are using, the metal you are soldering, and the equipment you are using.
Most soft solders melt at temperatures between 90 and 450 °C (190 to 840 °F), with the most commonly used alloys melting between 180 and 190 °C (360 and 370 °F). For example, the commonly used 60/40 Sn-Pb alloy melts at 188 °C (370 °F), while the 63/37 Sn-Pb alloy, used in electrical and electronic work, has a lower melting point of 183 °C (361 °F). Silver solder, on the other hand, has a higher melting point than lead-based solder. If you are using a lead-free solder, the melting point will be higher, typically between 50 and 200 °C higher.
The size of the solder joint will also impact the required temperature. A larger joint will require a higher temperature compared to a smaller one. Additionally, the equipment you use will influence the temperature setting. A high-effect soldering iron with a large tip that transfers heat efficiently will require a lower temperature, such as 250 °C, while a low-effect iron with a small tip that transfers heat poorly will need a higher temperature, possibly up to 400 °C.
It is important to note that the metal being soldered should have a higher melting point than the solder itself to ensure a strong bond without damaging the metal.
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Use silver solder for stainless steel
Silver solder is the best option for soldering stainless steel. Silver soldering can be used to join stainless steel to other stainless steel components, or to other metals such as cast iron, steel, copper, bronze, brass, silver, cupronickel, and gold. Silver solder creates strong, reliable, and smooth joints that are corrosion-resistant, leak-tight, and electrically conductive.
To successfully solder stainless steel, it is important to choose the right flux, solder, and heating tool. For example, a flux like No. 71 has the strong ingredients needed for soldering stainless steel. If you require a paste flux, No.144 is a good option as it has the same activity as No. 71 but in paste form. A gel flux, such as No. 78, is also suitable for soldering stainless steel.
When using silver solder, all related pieces must be very hot to get a good solder joint. Stainless steel must be heated to a dull red colour before adding the flux and solder. This means that a standard soldering iron won't be hot enough; instead, a torch (e.g. Oxy-Acetylene or Map gas) or a heavy-duty soldering iron is required.
Silver solder is available in different grades, such as SSF-6, which is cadmium-free and safe for the food and restaurant industries. SSF-6 can be used to silver solder stainless steel at 1150°F (626°C) to achieve strong bonds of 70,000 psi. For precision applications, SSQ-6 silver solder paste is available in an easy-to-apply syringe form.
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Frequently asked questions
It is unsafe to use a naked flame near a fuel tank, even if it has been washed out with water. Purging the tank with exhaust gases will make it safer.
It is important to clean the tank thoroughly before soldering. You can use a soldering iron, nodicks soldering paste, and 50/50 solder.
You should not use acid core solder as it makes the surface "dirty". Instead, use tinning flux and lead sticks to fill in the seams.
You need to get the metal hot enough to melt the solder, which requires a lot of heat if the tank is full of water. You can use CO2 or a propane torch to heat the metal.
