Legendary Kazanka M For many decades, the vastness of Russian water bodies has been plowing the expanses, remaining a symbol of reliability and accessibility. However, time and aggressive aquatic environment do not spare even the most durable duraluminium, requiring periodic attention and restoration from the owner. boat repair Kazan M It can extend its life for several decades, turning the old hull into a reliable boat.
Owners often face the need to fix small cracks, digest the seams or completely replace the bottom. Ignoring small defects can lead to fatal consequences on the water, so regular defects of the hull are a must for every captain. In this article, we will discuss in detail all the stages of restoration of the aluminum case, from diagnosis to finish painting.
Self-fulfillment requires not only a desire to save money, but also an understanding of the specifics of working with non-ferrous metals. Wrong solder or violation of welding technology can only make things worse, making further professional repair impossible. Let's figure out how to approach this process.
Diagnostics of the condition of the body and search for hidden defects
The first and most important step is to be thorough. defect Not only should we look at visible parts, because many problems are hidden under a layer of old paint or in hard-to-reach places, but we should pay special attention to the zygomatic sheets, the transom and the attachment of cans and stringers.
To detect microcracks that are not visible to the eye, experienced craftsmen use the method of capillary defects: the surface is degreased, covered with kerosene and then with chalk solution; the dark stripes that appear will indicate through damage, and the effective method is to check for a lumen with a powerful light source in the dark.
- 🔍 Visual inspection of all sutures and rivet joints for oxidation.
- 💧 Testing for leakproofness by filling the compartments with water or blowing air with soap solution.
- 🔨 Tapping the skin to detect detachments and hidden corrosive foci.
⚠️ Attention: When you see paint bloating (bubbles), there is almost always a corrosion spot underneath them. Don't just try to paint them over, you have to clean the metal to shine.
Of particular concern are hidden cracks in the corners and stress points, and if you find deep corrosion affecting more than 30 percent of the thickness of the sheet, it requires complete digestion or replacement, and ignoring this rule can lead to depressurization at full speed.
Technology of welding of duraluminum housing
Restoration of the integrity of the hull Kazan M. Duraluminum (alloys D16, D1) is a capricious material that requires strict compliance with the temperature regime. argono-arc welding (TIG) using a non-melting tungsten electrode.
Before welding, you need to carefully clean the edges of the parts to a metallic shine and degrease them. It is important to choose the right additive material; for alloys of the AMG system, SvaK5 wire is great, and for D16 special additives with a silicon content are not allowed, because this leads to the formation of hot cracks.
Before welding, warm up the part with a building hair dryer to 150-200 degrees - this will reduce the risk of cracks in the peri-seam zone and improve melting.
When you're doing your own work, it's critical to protect the welding bath from oxidation. Argon flow should be stable, and electrode movements should be smooth and uniform. If you don't have experience in welding aluminum, you'd better practice on the trimmings before you start the boat hull.
- ⚙️ Use a clean tungsten needle and proper electrode departure.
- 🌬️ Control of the flow rate of protective gas (argon) depending on the thickness of the metal.
- 🧹 Mechanical cleaning of the seam with a stainless steel brush immediately after cooling.
⚠️ Warning: Never use a steel brush to strip aluminum! iron particles trapped in the metal pores will trigger an irreversible process of electrochemical corrosion.
Salting and sealing of small cracks
For minor damages that do not require digestion of sheets, soldering is great, it is less time-consuming and does not require complex equipment, but requires careful surface preparation. solder for aluminum.
The soldering process begins by cutting the edges of the crack at an angle to increase the contact area, heats the surface with a burner, then applies a flux that dissolves the oxide film, then introduces a solder rod into the soldering area, which should spread over the metal, rather than rolling balls.
What solder is suitable for Kazanka?
For the repair of duraluminium shells, high-temperature aluminum-based solders (for example, 34A or its foreign counterparts HTS-2000) are best proven, providing a strong connection that is close in properties to the base metal.
Seam sealing of seams and rivet joints is often performed with special polysulfide or thiocol sealants. These formulations retain elasticity after drying, compensating for the thermal expansion of the metal. Before applying the sealant, the surface must be degreased with acetone or a special solvent.
☑️ Preparation for rations
Replacement of bottom and zygomatic leaves
If corrosion or mechanical damage has affected significant areas, the only way out is to replace entire sheets of skin. Kazan M. This is most often the case with the bottom and zygomatic sheets, which take the brunt of the planing, and you need to use sheets of aviation duraluminum at least 2 mm thick.
The replacement process starts with carefully drilling the rivets and dismantling the old sheet, and the new sheet is colored with flexibility, and then it is applied to the hull, and it is important to ensure that the edges fit tightly and the geometry is correct, otherwise the boat will lose its driving qualities.
The new sheets are welded or riveted, and the rivets are dural rivets that are installed in 20-30 mm increments, and all joints are sealed before they are finally fixed, a time-consuming process that requires precision and precision.
⚠️ Attention: When replacing the sheets of the bottom, monitor the symmetry of the zygomatic lines. Disturbance of geometry will lead to yawing of the boat on the course and difficulties when going to planing.
Anti-corrosion treatment and painting
The final, and perhaps the most notable, stage of the renovation is the painting. paintwork Not only does it give the boat an aesthetic appearance, it also serves as a major barrier to moisture, and aluminum is best suited for epoxy soils and polyurethane enamels, which are highly adhesive and resistant to ultraviolet.
Surface preparation accounts for 80 percent of the paintwork's success, and the metal is cleaned to a matte state, degreased and coated with acid soil (phosphate), only after that is applied the main layer of soil-filler, which hides the small risks and irregularities.
Perfect painting is impossible without proper preparation: 40% of the success is cleaning, 40% is degreasing and only 20% is the quality of the paint itself.
The paint is recommended to be applied with a spray gun in 2-3 layers with interlayer drying. Each layer should be thin to avoid sweating. Once drying, the surface can be polished, which will give it a deep gloss and additional protection.
Comparison of repair methods and materials used
The choice of recovery method depends on the extent of damage and available resources, and below is a table that helps determine the best way to repair for different situations.
| Type of damage | Recommended method | Materials | Complexity |
|---|---|---|---|
| Microcracks | Pike/Shermetic | Solder 34A, Flux. | Low. |
| Through holes | Argon welding | Svak 5 wire, Argon | High. |
| Corrosion of seams | Overcooking/Kleptka | D16 sheet, Rivets | Medium |
| Dumps. | Richtow | Wood hammer, Anvil | Medium |
Each method has its pros and cons. Welding is a monolithic bond, but requires skill. soldering is simpler but less durable to break. Rivet is a classic factory method, time-tested, but laborious to perform in garage conditions.
Frequently Asked Questions (FAQ)
Can I cook Kazanka with a regular electrode?
No, conventional arc welding with a coated electrode is not suitable for fine duraluminium. It causes too deep burn, splashing metal and does not provide a sealed seam. Use only argono-arc welding (TIG).
What is the best way to stop water flowing in an emergency?
For emergency leak removal, cold welding for aluminum or a special high-speed sealant is best suited, and you can also use a wooden blade wrapped in rags, temporarily hammering a hole with them.
Do I need to remove old paint before welding?
Any paint, dirt and oil that you heat up will burn, saturating the seam with hydrogen and pores, which will break it down, and you need to clean at least 2-3 cm around the seam.
What paint should I choose for an aluminum boat?
The best choice is two-component epoxy or polyurethane enamels (for example, Interflon, Tikkurila), which create a strong, chemically resistant film that is not afraid of gasoline and salt water.