Regan Brown
Building an in-bed fuel tank requires careful planning and execution to ensure safety and functionality. The process typically involves designing and fabricating a tank that fits the specific dimensions and requirements of the vehicle, such as a truck or car. The tank's capacity, material thickness, and construction method are crucial considerations. Welding, particularly TIG welding, is a common technique for constructing and repairing fuel tanks, but it requires expertise to avoid issues like porous welds and corrosion. Safety precautions, such as using fire blankets, spark arresters, and proper ventilation, are essential when working with flammable substances and high-heat processes like welding.
Characteristics and Values Table for Building an In-Bed Fuel Tank with TIG Weld
| Characteristics | Values |
|---|---|
| Material | Steel, Aluminium, Stainless Steel |
| Welding Process | TIG, MIG |
| Tank Capacity | 80-100 gallons |
| Tank Dimensions | 60"L x 17"W x 24"H |
| Filler and Pump Size | 2" |
| Baffles | Yes |
| Lifting Eyes | Yes |
| Coating | Powder coat, Rhino liner, Paint |
| Tank Placement | Secure with brackets and cross-boxed welding |
| Additional Features | Drain for clean out, Nozzle holder, Trailer plug for disconnect |
| Safety Considerations | Use fire blanket, Angle sparks away, Use cardboard/steel plates for spark arrest |
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What You'll Learn
Tig welding is best for stainless steel
Tig welding is a popular method for welding stainless steel. It is a challenging process to learn but is considered the best process for creating strong, aesthetically pleasing, and durable welds.
Tig welding, or tungsten inert gas welding, uses a tungsten electrode to produce a clean and precise weld. This method is preferred for stainless steel because it minimises heat distortion, which is a major issue when welding stainless steel. Stainless steel absorbs a lot of heat and holds it for longer than most other steels. Tig welding allows welders better control over the welding process, making it suitable for intricate and detailed work.
The use of an inert gas, usually argon, helps protect the weld area from contamination. This ensures a strong, corrosion-resistant weld, which is essential for maintaining the integrity of stainless steel structures.
To weld stainless steel, you need a quality Tig welder with adjustable amperage control. This allows you to fine-tune the heat for precise welding. A high-frequency start feature helps ignite the arc without touching the metal. Ensure the welder can handle the thickness of the stainless steel.
The diameter of the electrode you use is another important factor. The thicker the material, the larger the rod and the higher the amperage you need to achieve the appropriate penetration. The general rule of thumb is to avoid a taper of more than 2.5 times the electrode diameter. Additionally, the tip of the tungsten electrode should be sharp and flat, not balled, to create a stable arc with the workpiece.
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Use aluminium if weight-saving is crucial
If weight-saving is crucial, you can use aluminium to build your in-bed fuel tank. TIG welding aluminium is an art as much as it is a science. It requires skill and practice to weld with precision and consideration for cosmetics.
To TIG weld an aluminium fuel tank, you must first wash the tank with a detergent or soap and water. Then, fill the tank with water and purge the remaining space with a non-flammable gas like argon. Filling the tank with water reduces the area for vapour build-up and the amount of gas required.
You can also steam out the tank, but this requires a boiler. It is important to ensure that the tank is purged of flammable vapours to prevent explosions.
When welding, it is recommended to use 1/8" 5052 aluminium, a material commonly used for fuel tanks. Using a thinner material like .080 can save weight but makes weld warpage control more challenging.
Internal baffling can add strength to your aluminium fuel tank. It is also a good idea to buy a penetrant test kit to check for gaps or pinholes in your welds.
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$35.99
Steel is stronger, more ductile, and easier to weld
When building an in-bed fuel tank, it is important to consider the material you will be using. Steel is a popular choice due to its strength, ductility, and weldability.
Firstly, steel is a strong and durable material, making it ideal for fuel tank construction. Most plain steels have a tensile strength of around 40,000 psi, but some specialized steels can have tensile strengths of up to 200,000 psi. This high strength ensures that the fuel tank can withstand the weight of the fuel and any external impacts or pressures.
Secondly, steel is a ductile material, which means it can handle impact and tension better than some other materials. This ductility allows for the absorption of forces without permanent deformation or failure. In the context of a fuel tank, ductility can provide added safety in the event of collisions or extreme conditions.
Lastly, steel is a weld-friendly material. Welding is a common method for joining steel components, and the process can create strong and reliable joints. When welding steel, the weld deposit often exhibits higher hardness than the parent material, resulting in stronger welds. Additionally, the use of welding fillers can further enhance the strength of the welds, with fillers reaching tensile strengths of up to 120,000 psi. This makes steel an ideal choice for constructing fuel tanks, as welding can provide secure and long-lasting connections.
When building an in-bed fuel tank with steel, it is important to consider the welding process carefully. TIG welding, also known as Gas Tungsten Arc Welding (GTAW), is a precise and clean welding method suitable for thinner metals. By using a non-consumable tungsten electrode and a shielding gas, TIG welding produces high-quality welds with minimal splatter and distortion. This technique is often favored for projects that require aesthetic appeal and precision, such as custom automotive modifications.
In summary, steel is a preferred material for building in-bed fuel tanks due to its inherent strength, ductility, and weldability. TIG welding is a suitable method for joining steel components, providing strong and visually appealing welds. However, it is crucial to follow safety precautions when welding near fuel tanks, as sparks and heat can pose risks.
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Avoid porous welds by using a liner
Porosity is a weld defect referring to unwanted trapped gases (often oxygen) within a welded joint. This results in weld metal porosity, which appears as rounded holes in the weld bead. Although porosity is infrequently considered a serious defect, it can affect the weld's overall strength and integrity.
To avoid porous welds, it is important to prevent weld metal contamination. Contamination can occur when the shielding gas doesn't completely reach the weld pool, allowing atmospheric air to adversely affect the weld bead. This can be caused by drafts from open doors, fans, or machinery, which disturb the delivery of the shielding gas. To avoid this, minimise any air movement that might disrupt the protective gas.
Another cause of weld metal contamination is dirty metal surfaces. To prevent this, clean all surfaces of rust, paint, dirt, coolants, coatings, and other contaminants before welding. Ensure that the welding rods and wires are also clean and free from rust or other contaminants.
In addition, cracked or blocked MIG liners can introduce unwanted elements to the weld pool. Therefore, it is important to clean and replace MIG liners regularly and ensure that the fittings on welders and regulators are tight and clean.
By following these steps and maintaining your equipment, you can largely avoid porous welds and produce strong and intact welds.
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Protect the tank with a fire blanket
When welding a fuel tank, it is important to take precautions to prevent fires and protect the tank. One way to do this is by using a fire blanket. Fire blankets are effective at extinguishing fires because they prevent oxygen in the air from fueling the flames. By fully covering the tank with a fire blanket, you can cut off the oxygen supply and effectively smother the fire.
There are several types of fire blankets available on the market, and they can be made from different materials such as silica fibers, fiberglass, or quartz fibers. These materials are all flame-retardant and can withstand high temperatures. Silica blankets, for example, can resist temperatures above 1,000 °C for extended periods.
When using a fire blanket to protect a fuel tank during welding, it is important to ensure that the blanket completely covers the tank and is securely held in place. Magnets can be used to hold the blanket in place, ensuring that it does not slip or move during the welding process. It is also important to consider the size and type of blanket needed for your specific tank and work area.
In addition to a fire blanket, other precautions should be taken when welding near a fuel tank. This includes considering the type of welding process being used and the type of fuel in the tank. For example, arc welding should be done at least 4 inches away from a diesel tank, while petrol fumes should be avoided altogether due to their high flammability.
By following these precautions and using a fire blanket to protect the tank, you can significantly reduce the risk of fire and ensure a safer welding process when building an in-bed fuel tank using TIG welding.
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Frequently asked questions
TIG welding with stainless wire is the best process for welding a new fuel tank. If you can afford to make the tank out of aluminium, you can probably afford stainless steel, which has the same weld properties as black iron but is stronger.
Aluminium is superior to steel when weight savings are crucial, such as in racing, and where corrosion is a serious problem, such as in marine fuel tanks.
The main risk is that sparks from welding or grinding will reach the tank area and cause a fire. It is important to make sure your insurance is up to date and to use fire protection such as fire blankets, gauntlets, steel plates, or cardboard to catch sparks.
It is recommended to put baffles in the tank and to back step the seams. Lifting eyes are also handy to have. To prevent water from being trapped under the tank, you can put some skids underneath.
