The question of what the connection of wires to each other is called often confuses not only novice car enthusiasts, but also those who are trying to understand electrical engineering. In fact, there is no single term, since many names are used in the professional environment depending on the technology and materials used. The main concept that unites all methods is electrical contact, the quality of which directly affects the safety of the entire system.
In automotive electrics, where there are constant vibrations and temperature changes, the reliability of the connection of current-carrying conductors is a critical parameter. Improperly performed work can lead to heating, melting of insulation and even fire. That is why it is important to know not only the general name, but also specific technical solutions, such as crimping or soldering.
In this article, we will examine in detail how various methods of joining cores are correctly named, what tools are required for this, and why some methods are strictly prohibited in modern standards. Understanding these nuances will help you avoid fatal mistakes when repairing your car's wiring.
Basic terms and classification of contacts
Before starting the practical part, you need to understand the terminology. In electrical engineering, the process of combining conductors is called connection, but depending on the context, the words "docking", "splicing" or "branching" may be used. Each of these concepts implies the creation of an unbroken electrical circuit with minimal transition resistance.
The most basic element that ensures contact is contact connection. It is this that guarantees the transfer of current from the source to the consumer. In automotive wiring, the term “chip” or “block” is often used, which is a slang name for plug-in connections, but it is more technically correct to use the term contact group.
⚠️ Attention: Using the terms “twisting” and “soldering” as synonyms is erroneous. Twisting is just a preparatory step or a temporary solution, while soldering is the process of creating a monolithic joint using solder.
It is important to distinguish between detachable and one-piece types. The first include all types of terminal blocks and connectors that can be removed without damaging the conductor. The latter, such as welding or crimping, require breaking the contact for separation. The choice of method depends on whether servicing of this node is planned in the future.
To secure the material, let’s look at the main types of connections that you will find in manuals:
- 🔌 Terminal connection - use of screw or spring clamps.
- 🔥 Soldering - connection with soft or hard solders.
- 🔩 Crimping - compression of the sleeve around the cores with a special tool.
- ⚡ Welding - melting the ends of conductors with an electric arc.
Twisting: myths, reality and rules of execution
The simplest and most common method, which is popularly often simply called “twisting”, is technically called twisting the wires. For a long time, this method was considered the main one, but modern standards of PUE (Electrical Installation Rules) prohibit the use of twisting in its pure form as a final option. This is due to the fact that over time the metal undergoes oxidation, the contact weakens and begins to heat up.
However, in automotive practice, twisting is often used as a preparatory step before soldering or crimping. If you need to temporarily restore the chain in the field, twisting it will allow you to get it to the garage. The main thing is to understand what it is temporary solution, requiring mandatory improvement.
To perform high-quality twisting, it is necessary to strip the insulation to a length of 3-5 cm and tightly twist the cores together. The number of turns must be sufficient to ensure mechanical strength. After this, the contact point must be insulated with heat shrink or high-quality electrical tape.
Let's look at the typical mistakes that are made when performing this operation:
- ❌ Twisting copper and aluminum wire (causes electrochemical corrosion).
- ❌ Insufficient stripping length (weak contact).
- ❌ Lack of insulation or use of low-quality materials.
- ❌ An attempt to twist more than three wires at the same time without subsequent soldering.
Why can't you twist copper and aluminum?
When these two metals come into contact in the presence of moisture, a galvanic couple is created. Aluminum begins to actively oxidize, which leads to a sharp increase in resistance and heating of the joint until it ignites.
Terminal connections and their varieties
When it comes to what a reliable connection of wires is called, they most often mean terminal connection. This is a universal method that allows you to quickly and efficiently connect conductors. Cars use special automotive terminals that are vibration resistant.
There are many types of terminal blocks. Screw ones require periodic tightening, as vibration can weaken the clamp. Spring (for example, systems like Wago) are considered more modern and reliable, as they provide constant clamping force regardless of external factors.
Automotive electrics also typically use knife terminals. They penetrate the wire insulation, providing contact without stripping. This speeds up installation, but requires strict adherence to installation technology.
Comparative characteristics of popular types of terminals are presented in the table below:
| Terminal type | Reliability | Installation speed | Vibration resistance |
|---|---|---|---|
| Screw | Average | Low | Low |
| Spring | High | High | High |
| Knife | High | Very high | Average |
| Tubular (for crimping) | Maximum | Average | Maximum |
When choosing a terminal block, always pay attention to the rated current for which it is designed. Using terminals that are too small for powerful consumers (for example, to connect an amplifier or headlights) will cause them to melt.
Soldering technology: creating a monolithic contact
Soldering is the process of joining metals using molten solder. In the context of the question “what is a wire connection called?”, soldering is one of the most reliable methods of creating permanent contact. When done correctly, a soldered joint is as strong and conductive as a solid wire.
For automotive electrical work, tin-lead solders are most often used (for example, POS-61) and rosin fluxes. It is important that the soldering iron tip is well heated and the surfaces are thoroughly cleaned of oxides. Only in this case will the solder spread evenly over the wires.
The soldering process requires certain skills. It is necessary to first warm up the wires themselves, and then apply solder. If you simply drop molten metal onto a cold wire, a so-called “cold soldering” will occur, which will not provide proper contact and will quickly collapse.
Use solder paste instead of regular rosin for difficult areas - it is easier to apply and often does not require subsequent rinsing.
After cooling, the soldering area becomes hard. In a car environment where wires are constantly moving, this can be a problem. Therefore, it is recommended to additionally fix the soldered joint or use heat shrink with an adhesive layer to prevent the core from breaking at the edge of the contact.
Crimping: professional standard
Crimping is a method of connecting wires using special sleeves or lugs that are compressed (pressed) around the wires using press pliers. In a professional environment, this connection is often called sleeved. This method is considered the “gold standard” for automotive electrics.
The essence of the method is that, under enormous pressure, the metal of the sleeve and the wire cores diffuse into each other, creating a monolith. Such a connection is not afraid of vibration, temperature expansion and does not require maintenance during the entire service life of the vehicle.
To perform crimping you must:
- 🛠 Select a sleeve strictly according to the cross-section of the wire (no more and no less).
- ✂️ Strip the wire to a length corresponding to the length of the sleeve.
- 🦀 Use a specialized tool (crimper), not pliers.
- 🛡️ Isolate the joint with heat shrink.
Using regular pliers instead of a crimper is a common mistake. They cannot provide uniform crimping on all sides, which leads to weakening of the contact. The professional tool has profiled jaws that form the correct compression profile.
☑️ Checking the quality of crimping
Comparative analysis of methods and selection of tools
The choice of connection method depends on the specific application, available equipment and operating conditions. If you are wondering what the most durable connection is called, then the answer is clear - it is crimping or welding. However, for household repairs in the garage, high-quality soldering or the use of modern terminals is often sufficient.
It is important to consider the material of the conductors. For aluminum, which is rare but found in old cars or in power lines, special measures to protect against oxidation (quartz-vaseline lubricant) and special terminals are required. Copper is more forgiving, but also requires care.
Don't forget about isolation. Even the most perfect connection will become useless and dangerous if it is not protected from moisture and short circuits. Heat-shrinkable tubing with an adhesive layer ("cambrics") is the best choice for automobiles as it seals the contact.
The ideal connection for a car is crimping with a tinned copper sleeve, followed by heat shrink insulation with an adhesive layer.
Frequently asked questions (FAQ)
Is it possible to connect copper and aluminum wire?
Direct twisting is strictly prohibited due to galvanic corrosion. Connection through a terminal block with a dividing partition or through a steel bolt with washers is allowed, but it is better to avoid such solutions in a car.
What is better to insulate a connection in a car: electrical tape or heat shrink?
Heat shrink with an adhesive layer is much better. It creates an airtight cocoon that protects against water, oil and gasoline, while the electrical tape dries out and slips over time.
Do I need to tin the wires before crimping?
No, tinning the wires before crimping them into a sleeve is not necessary and is even harmful. Solder is a soft metal; under pressure it will “flow” and the contact will weaken. Crimping is done only on pure copper.
What is the name of the connection when three wires meet at one point?
It's called branch or branching. To implement it, it is best to use special T-shaped terminals or the method of crimping into a sleeve into which all three ends are inserted.