We solder the refrigerator with our own hands: tools, materials and safety precautions

Soldering a refrigerator is a task that equipment owners face when copper tubes, aluminum evaporators or cooling circuits are damaged. Most often, the need for soldering occurs after mechanical damage, corrosion, or unsuccessful repair attempts. However, not everyone knows what exactly is required for high-quality repairs and how to avoid typical mistakes that can lead to freon leakage or compressor failure.

In this article we will analyze in detail all the necessary tools, materials and soldering steps - from surface preparation to leak testing. You will learn which ones solders and fluxes are suitable for aluminum and copper, how to use a gas burner correctly, and why some “folk” methods (for example, soldering with tin without flux) can result in repeated repairs in a month. We will also reveal the nuances of working with different types of refrigeration systems - No Frost, drip and absorption.

If you have never soldered metals before or are not confident in your skills, soldering a refrigeration circuit is not the best project for first experiments. Mistakes here are fraught not only with loss of time, but also with the failure of expensive components. However, with the right approach and minimal experience, repairs are quite possible at home.

1. When soldering of a refrigerator is required: main reasons

Soldering is not a universal solution for all refrigerator malfunctions. It is necessary only in cases where the tightness closed circuitthrough which the refrigerant circulates is broken. Here are typical situations that require intervention:

• 🔧 Mechanical damage to tubes —for example, after moving a refrigerator or inaccurate repairs. Thin copper capillaries on the rear wall are more often affected.
• 🧊 Corrosion of aluminum evaporators - typical for models with a system No Frost, where moisture and condensation accelerate metal oxidation.
• 🔥 Overheating and melting of the circuit — happens when there are short circuits or the tubes are close to the heating elements (for example, in the defrost zone).
• ⚡ Poor previous repair —if soldering was done without flux or with unsuitable solder, over time the seam begins to leak freon.

Before you take up the soldering iron, make sure that the problem is a refrigerant leak. Signs of this are:

• 🌡️ The compressor works without stopping, but the refrigerator does not cool.
• ❄️ Frost appears on the back wall only in certain areas (where freon is still circulating).
• 🔊 Characteristic hissing or gurgling at the site of damage (for large cracks).

⚠️ Attention: If the refrigerator uses a gas refrigerant (for example, R600a), soldering should be carried out in a well-ventilated area - freon vapors are explosive at high concentrations.

2. Tools for soldering: minimal and professional set

The quality of soldering depends 80% on the correctly selected tool. For one-time work, you can get by with a minimal set, but if you plan to repair refrigerators regularly, it’s worth investing in professional equipment. Below is a comparison table:

If you are soldering aluminum evaporator, you cannot do without special flux and solder. Ordinary tin simply will not stick to aluminum. due to the oxide film. For copper, standard solder is suitable POS-61, but it is better to use lead-free analogues (for example, Sn99Cu1), since lead can cause corrosion over time.

Also useful freon leak detector (even homemade from a soap solution) - it will help check the tightness of the seam after soldering. To accurately diagnose leaks, professionals use electronic detectors (for example, Inficon D-TEK Select), but for one-time repairs it is possible. you can do without it.

3. Preparing the refrigerator for soldering: step by step. instructions

Before you start soldering, the refrigerator must be properly prepared. This step is often missed, but the success of the entire repair depends on it. Here's what you need to do:

1. Disconnect the refrigerator from the connection. network and defrost it. Any moisture inside the system can interfere with soldering or cause corrosion of the seam.
2. Drain the freon (if it is still left in the system). To do this, use manometer a cylinder to collect the refrigerant. Do not release the freon into atmosphere!
3. Clean the soldering area from dirt, oil and oxides. Use sandpaper (120–240 grit) or a metal brush. For aluminum, it is better to use special cleaners (for example, Aluminium Cleaner).
4. Fix the tubesso that they do not move during soldering. For this you can use a vice with soft jaws or homemade wire fasteners.

Pay special attention cleaning metal. Even a small layer of oxides or fat can prevent the solder from sticking. For copper, mechanical cleaning is sufficient, but for aluminum an additional dissolving flux is needed. oxide film.

If you are soldering capillary tube, keep in mind that its diameter is very small (about 0.6–0.8 mm). wire with a diameter of 0.5 mm. A magnifying glass or magnifying glass is also useful to control the process. micro burners with a thin flame and solder in the form of a wire with a diameter of 0.5 mm. A magnifying glass or magnifying glass is also useful to monitor the process.

⚠️ Attention: If the refrigerator worked on freon R134a or R600a, do not use open flames near the compressor - residual refrigerant in the oil may ignite. It is better to dismantle the compressor before soldering or work at a distance of at least 30 cm from it.

What to do if it is not possible to drain the freon?

If there is no pressure gauge manifold, you can try to “blow” the freon out of the system using a compressor (by connecting it to the discharge fitting). However, this method is risky - if you are careless, you can damage the compressor. An alternative is to carefully pierce the tube in the thinnest place and allow the freon to evaporate naturally (only in the open air!).

4. Soldering technology: copper vs aluminum

Copper and aluminum are soldered differently due to differences in melting point and chemical properties. Below are detailed instructions for each metal.

Soldering copper tubes

Copper is the most “friendly” metal for soldering. It conducts heat well and bonds easily to most solders. Procedure:

1. Apply flux to the cleaned surface. For copper, LTI-120 or rosin is suitable.
2. Heat the soldering area with a torch to the melting temperature of the solder (about 250–300°C for POS-61). The copper should turn dark red.
3. Apply solder to the joint. It should spread under the action of capillary forces. Do not overheat! Excess heat can burn through a thin tube.
4. Allow the seam to cool naturally (do not cool with water!). Remove flux residues with alcohol.

Soldering aluminum evaporators

Aluminum is more difficult to solder due to the oxide film that instantly forms in air. Here you need a special flux (for example, F-SW21 or Fluxite) and solder with a high zinc or silicon content. Algorithm:

1. Clean the aluminum with a metal brush immediately before soldering (an oxide film is formed in seconds!).
2. Apply aggressive flux brush. It should dissolve the oxides.
3. Heat the soldering area to 400–450°C (aluminum melts at 660°C, but solder melts at a lower temperature).
4. Apply solder (for example, Castolin 192 FB) and distribute it evenly along the seam. If the solder does not stick, add flux and repeat heating.
5. After soldering rinse the seam thoroughly with waterto remove flux residues (they cause corrosion!).

Critical for aluminum do not overheat the metal —it can become deformed or even burn out. Also avoid soldering in places with high mechanical stress (for example, on pipe bends), since aluminum is less durable than copper.

5. Checking the tightness after soldering

Even a perfect-looking seam can let freon through. Therefore, after soldering, be sure to check the tightness of the system. Here are three methods, from the simplest to the most reliable:

• 🧼 Soap solution - apply it with a brush to the seam. If bubbles appear, there is a leak. Minus: microcracks are not visible.
• 💨 Pneumatic testing - connect a compressor to the system (pressure 10–15 atm) and immerse the part in water. Bubbles will indicate a leak.
• 🔍 Electronic leak detector is the most accurate method. The device reacts even to minimal concentrations of freon.

If a leak is detected, the seam must be resolder, having previously removed the old solder with a soldering iron or hair dryer. Do not try to “cover up” the leak with sealant - this is a temporary solution that will lead to repeated repairs.

After a successful check, you can fill the system with freon. To do this you will need:

• Cylinder with refrigerant (the type must correspond to the refrigerator model).
• Gauge manifold.
• Vacuum pump (to remove moisture from the system before filling).

⚠️ Attention: If you fill the refrigerator with freon R600a (isobutane), remember that it is extremely explosive. Refueling should be done in a ventilated area, away from open flames. Also avoid getting the refrigerant on your skin - it causes frostbite.

6. Typical mistakes and how to avoid them

Even experienced craftsmen sometimes make mistakes when soldering refrigerators. Here are the most common of them and ways to prevent them:

Another common mistake is soldering without flux. Some “masters” believe that you can only use solder, but without flux the seam will turn out weak and leaky. Flux not only removes oxides, but also improves it. spreadability of solder.

Also, you should not skimp on solder quality. Cheap Chinese alloys often contain impurities that destroy the seam over time. It is better to buy proven solder once (for example, German one). data-i="238">or American Würth or American Harris, than to redo the work in six months.

7. When soldering does not help: alternative solutions

Sometimes soldering is impossible or impractical. For example:

• 🔧 Severe corrosion of the tubes - if the metal is so thin that it does not hold its shape, soldering is pointless. Solution: replacing a section of the tube.
• 💥 Cracks in the compressor - soldering is unacceptable here due to high pressure.
• 🧊 Damage to the evaporator in a hard-to-reach place (for example, inside the wall of the refrigerator). Solution: replacing the evaporator or refrigerator.

In such cases, it is better to contact professionals or consider buying a new refrigerator if repairs will cost more. 50% of its cost. For example, replacing a compressor in a refrigerator can cost up to 15,000 rubles, which is comparable to the price of a used model. Also, soldering will not help if the problem is not a leak, but: data-i="253">or Samsung RL-34 can cost up to 15,000 rubles, which is comparable to the price of a used model.

Also, soldering will not help if the problem is not a leak, but:

• Malfunctions thermostat or electronic control unit.
• Clogged capillary tubes (needs flushing or replacement).
• Failure fan in fan systems No Frost.

⚠️ Attention: Parts of refrigerators of some brands (for example, Liebherr or Miele) may have special coatings that complicate soldering. In such cases, it is better to use original repair kits from the manufacturer.

8. Safety measures when soldering a refrigerator

Soldering a refrigerator is a process associated with several risks:

• 🔥 Fire hazard - open fire, flammable freon vapors.
• 💨 Poisoning by metal and freon vapors.
• ⚡ Electric shock (if you do not disconnect the refrigerator from the network).

To minimize risks, follow these rules:

1. Work in well ventilated area or outdoors.
2. Use respirator with a metal vapor filter (for example, 3M 6000 with cartridges ABEK).
3. Keep at hand ABC class fire extinguisher (in case of freon ignition).
4. Do not solder near flammable materials (plastic, wooden furniture).
5. After work wash your hands with soap - fluxes and solders contain toxic substances.

If you are soldering a refrigerator with a system No Frost, please note that moisture may remain in it. When heated, it turns into steam and can cause a micro-explosion inside the tubes. To avoid this, before soldering Purge the system with nitrogen (if possible) or thoroughly dry it with a hairdryer.

FAQ: Frequently asked questions about soldering a refrigerator

Is it possible to solder a refrigerator with a regular soldering iron?

No, a regular electric soldering iron (even with a power of 100 W) is not suitable for soldering copper or aluminum tubes of a refrigerator. The temperature of the soldering iron (maximum 400°C) is not enough to properly heat the metal, and the open flame of the burner allows more precise control of the process. The exception is soldering thin wires in the electronic components of the refrigerator, but this is another task.

What kind of freon is used in modern refrigerators?

Most modern models use:

• R600a (isobutane) - environmentally friendly, but explosive. Used in Samsung, LG, Indesit.
• R134a - less dangerous, but inferior in effectiveness. Found in old models Atlant or Birusa.
• R290 (propane) - rarely, mainly in industrial refrigerators.

The type of freon is indicated on the refrigerator nameplate (usually on the back wall or inside the chamber).

How much does it cost to refill the refrigerator with freon after soldering?

The cost depends on the type of freon and the region:

• R600a: 500–1000 rubles per 50 grams (enough for 1–2 refills).
• R134a: 300–600 rubles per 30 grams.
• Work of a master: 1500–3000 rubles (depending on complexity).

If you refill it yourself, keep in mind that you will need to vacuum the system (to remove moisture), and this requires a vacuum pump.

Is it possible to solder aluminum with tin?

No, ordinary tin (solder POS-61) is not suitable for aluminum due to the oxide film. To solder aluminum, you need a special solder with a high zinc or silicon content (for example, Castolin 192 FB, Aluminium 13) and an aggressive flux (F-SW21, Fluxite). Without them, the seam will be fragile and will quickly leak.

What to do if after soldering the refrigerator does not cool?

There may be several reasons:

1. Leaking seam -check with a soap solution.
2. Not enough freon —fill the system using the pressure gauge.
3. Clogged capillary tube —flushing or replacement is required.
4. The compressor is faulty —check the windings with a multimeter.
5. In No Frost systems - the fan does not work.

Start by checking the tightness of the seam and the freon level. If everything is in order, diagnose the compressor and electronic components.