Metal pipes can be used for intra-house water communications for a short time. Metal pipes may be operated for a strictly allotted period of time. Oxides, calcareous deposits inside the iron lines reduce the inner diameter of the pipes, and destroy the water supply. Designed and assembled correctly, heating systems do not require additional maintenance.
Pipes in the heating system can be connected without the use of hot welding
Classic high temperature welding
How to weld heating from an iron pipe in accordance with building codes is specified in GOST. The diameter of the pipes and the length of the system matter. SNIP will indicate how to properly weld pipes for heating in each specific case: a private home, a multi-storey building or an industrial water supply line.
When using a gas welding machine to create high-quality seams, considerable practical experience will be required. It is also possible to create welded joints of impeccable quality by electric welding, but in this case not only experience will be required, but also high-quality electrodes, a correctly selected current level and a “sense of arc”. High-quality electric welding of the heating pipe is available only to true professionals.
Metal pipes - the most common material for heating systems
The strength of the metal pipes is more than sufficient for the water supply system and for the heating circuit. It is the connection sections that have to be implemented in order not to deviate from the design documentation that are the "weak link" of the system. How to cook a heating pipe by electric welding is described in detail in outdated training materials and articles. In modern construction, the cold welding method for heating pipes is more often used.
It's important to know! Threaded joints of metal pipes are used in cases where it is necessary to create a detachable connection. The tightness of the connection in this case is guaranteed by the sealant, most often tow.
How to cook a heating pipe correctly knows every qualified installation engineer. There are a number of rules that must be followed:
- The weld should not consist of scale. This happens if you cook the pipe by electric welding, using low-quality electrodes.
- To weld metal with an electric welding machine, it is necessary to use the method of multilayer molten metal. The primary scale of the seam is removed before the next weld layer.
- It is important to choose the current level correctly - a low current does not guarantee the strength of the weld. Too high a current during welding is also unacceptable.
- If the butt welding method is used, the electrode metal or molten wire is used as the reinforcing material.
- Electric welding metal pipelines and other elements of heating and plumbing systems is prohibited near flammable objects.
Gas welding is a universal method for creating a strong connection of metals; metal parts of different sizes can be joined in any combination.
For traditional welding, you need to have special equipment and experience in welding
The high temperature of the jet of burning gas allows melt the metal in the area of local heating, and cook the metal at the molecular level. Requires expensive equipment and highly qualified welders.
Installation of a heating circuit by cold welding
Cold welding is a combination of two or more elements without heating them. The compound is formed due to chemical reactions that occur in the adhesive. Plasticity, high adhesion and quick solidification into a monolithic mass are the distinguishing features of the components used for cold welding.
The adhesive composition may include various elements to improve the mechanical characteristics of the adhesive joints. The compositions are usually based on epoxy resin, and the filler is a hardener. The packaging indicates whether it is possible to weld heating pipes with cold welding, or is it a composition for repairing plastic pipes in a cold water supply circuit.
Cold welding is a plastic mass that provides a tight connection of pipes
There are two types of components for cold welding:
- A plastic two-component substance, which immediately before use must be thoroughly kneaded to mix the components. The advantage of cold welding of this type: the composition is quickly prepared, stored for a long time, requires minimal preparation before use. Disadvantage: it hardens quickly, it must be applied very carefully, it is recommended to use it as soon as possible after preparation.
- Liquid components. Before starting application, it is necessary to combine the substances in the proper proportion, and the glue is ready for use. Advantages of the liquid composition for cold welding: the adhesive easily penetrates deep into the joint, forming a solid layer during curing, resistant to mechanical stress. Disadvantage: requires special conditions for long-term storage. For different materials - plastic, metal - different chemical components are required.
The main advantage that distinguishes cold welding of any kind is the ability to quickly repair a portion of a water supply, heating or sewer system without shutting off the water supply. Welding, or in this case, bonding of components can be performed in conditions of increased fire hazard.
Important! For high-temperature circuits, in particular heating systems, there are chemical compounds, the operation of which is possible in conditions of more than 1000 degrees Celsius.
As a repair composition for cast-iron heating radiators, the surface should be carefully prepared for the use of cold welding. Despite the strength of the joint, the reconstructed area may not withstand the tests with maximum pressure.
For plastic plumbing systems, the cold welding method is recognized as one of the best solutions for local repair when it is impossible to replace a damaged element. Cold welding is also successfully used to restore the tightness of butt joints on plastic water pipe fittings.
Cold welding is an effective method for urgent repair of any pipe
Waiting time for the finished composition of cold welding: from 2 to 20 minutes, depending on the intended purpose. The temperature range is from 0 to 1300 degrees.
It is enough to familiarize yourself with the instructions for use, and the installation of the system will be successfully completed. To work, you will need:
- capacity for the preparation of the composition;
- gloves to avoid skin contact. It is recommended to moisten them with water;
- thin spatula, for applying a viscous composition to the field of use;
- compliance with safety rules when working with chemical components.
If the composition gets on the skin or in the eye area, it is recommended to rinse the affected area of the skin and, if there is a burning sensation, consult a doctor with a package of cold welding components.
