Welding Done by Certified WeldersSend an inquiry
Manual welding is the most versatile and simple process. It is used for welding of almost all materials (Inox, Alu, Fe) to produce the least to the most demanding welds. Welding can be done in plants or outdoors. The most common methods of welding are MAG, MIG, TIG and spot welding.
Our welding is subject to approved welding procedures (WPQR); we always have at least 10 welders certified in accordance with the EN 287. Welding quality is assured in accordance with the highest requirements of the EN ISO 3834-2. Control is carried out by certified personnel for visual examination (VT).
Despite otherwise almost total automatisation in the locksmithing and metals industries, manual welding remains an indispensable working method. It is true that robots have simplified many processes, however they cannot replace people. When products are specialized or it is necessary to weld unique products or a smaller number of products, manual welding is still the best option. It is also the case that robots cannot perform welding in the field.
TIG Welding ProcedureTIG welding is an electro-glass welding process with a non-volatile tungsten electrode in a protected environment.
MIG/MAG Welding ProcedureMIG and MAG welding, which are among the most common welding processes, are mainly used in industrial production and in the manufacture of steel structures.
Manual welding performed by certified welders
We have a team of twenty welders on hand, who are skilled and hold all certificates in accordance with the EN 287 directive, which means we are also ready to rise to especially demanding challenges. Manual welding is mostly needed in the field, when raising metal constructions, but there are also orders where manual welding is performed in our production workshop. Be they are boutique or incredibly innovative, we always find the right solution.
We offer different welding procedures which, if necessary, we complete with the use of modern technologies and you can count on our support from the planning stage to the finished product or installation.
We offer you all types of manual welding in free atmosphere and in the shielded environment. Ask about arc welding, industrial TIG welding, MIG welding with argon or helium shielding and MAG welding. We ensure the highest quality for manual welding as well as for spot welding.
Experts for all welding processes
The welding of metal elements means welding of the material. Welding has long since replaced older methods, for example riveting, which were not suitable for all needs and which, at the same time, didn't ensure the required safety and durability.
The use of electrical energy enabled resistance and arc welding. With these welding methods the materials soften and join under an additional pressure or they melt. They produce joined materials of high quality; as far as the mechanical properties are concerned, the welds are strong and homogeneous, without cracks — metallic elements or workpieces are therefore always strongly combined. They ensure safety and longevity, which are of key importance with products and constructions.
The method of welding always needs to be adjusted to the materials and characteristics of the desired end product — this is the only way to ensure its quality and safety, its suitability for purpose, and that it will be in accordance with the appropriate standards and will have a long life span. At Kovinc d.o.o. we therefore offer different welding types, suitable for the widest possible spectrum of products, and you can choose manual as well as robotic welding.
We perform arc welding as well as resistance welding; our services are thus wide enough to satisfy all wishes — our references at home and abroad are proof of that.
Arc welding is rendered possible by four specific methods:
1. Arc welding in free atmosphere or "in air", which is performed as manual arc welding with a coated electrode. Because of the electrical energy, an arc or a passage of electrons is formed, while the wire and the coating melt under the high temperature and enable the joining of the workpieces. The wire is coated, therefore the weld is protected against corrosion.
2. In the shielded environment we can weld with an uncoated wire in an active gas — carbon dioxide. This method is known as MAG welding, where partial oxidation occurs due to the disintegration of CO2. The method is widely used and foremost suitable for simple products.
3. MIG welding is performed in a shielded environment with the help of argon (or helium), an inert gas, which prevents oxidation and enables nice, strong welds. With it we can weld non-ferrous metals and their alloys, aluminium and alloys, as well as steels. The advantage of MIG welding is in the possibility of welding thicker materials.
4. TIG welding is the most challenging and provides perfect results. As a method of manual welding it is extremely demanding and requires a highly skilled and precise welder. It is performed in a shielded environment (argon or helium). It is used for welding metals and alloys with a high melting point and it uses a pure or alloy tungsten electrode, which does not wear out. TIG welding is the most perfect and ensures the strongest welds, which are extremely resistant to corrosion and ensure the longest life span.
Resistance welding is foremost designed for welding different types of sheet metal, regardless of the material. The material is placed between the electrodes; under the influence of electrical current a resistance is formed between them, which provides enough thermal energy for the materials to soften and join. Different electrodes are used according to the material, while taking into account the material as well as its thickness resistance welding needs an adjustment of the whole welding cycle — high current intensity with the adjustment of the impulses, differences in welding times (in milliseconds) and differences in the voltage. Resistance welding also enables different joining or welding methods according to the position of workpieces and the shape of the electrodes.
1. The most commonly known resistance welding is surely spot welding, which enables the joining of steel and non-ferrous metals of 3mm maximum thickness. The whole energy is directed into a spot between the electrodes, therefore the surrounding area is not damaged and there is no overheating. With adjustments in the welding cycle spot welding is also possible for thicker and hardened steel. The material for spot welding (as well as for resistance welding) in general differs according to the material we weld.
2. Next to spot welding we know other types of resistance welding. With the plug welding method we squeeze a flat sheet metal and a sheet metal with plugs (warts) between two electrodes. Under pressure they soften and "stick" together.
3. To the most commonly used methods of resistance welding we can add disk welding (with disc-shaped electrodes for, for example, the welding of reservoirs), butt-welding (where the workpieces face each other, it is used, for example, for chains and sticks) and flash-butt welding.
With resistance welding we can weld the workpieces of the same or different material — for example steel and copper.
Services in the production halls or on construction sites
Welding usually takes place inside our production plant, but we also often perform it in the field. It that case we first conduct a preliminary inspection and prepare in advance all that we can, so that at the location we only weld and finish the installation.
The advantage of our company is a complete offer, with which we assure you cooperation from the planning stage to the preparation of the material and the final implementation. Welding is, namely, only one of the procedures of making metal products or constructions — we also perform laser cutting as well as pipe and sheet metal bending with its surface treatment. No matter whether you need only robotic or manual welding, or other locksmithing and metal treatment services, you need look no further than Kovinc d.o.o.!