How to weld?
Welding is the connection of various parts by melting the material, directly of these parts. When welding using a welding machine or an inverter and electrodes. Very important protective shield (or mask of the welder), a suit of thick material and gloves, it is better from tarpaulin. To churn the scale from the weld, you will need a hammer with a sharp end. Next, consider how to do the welding.
Starting learns best on metal, which is no good for anything other than how to become a training dummy. It is better to have a bucket of water next to you, and there should not be any combustible materials in the area. Even a small residue from the electrode can cause a fire.
Attach the grounding firmly to the part, insert the electrode into the holder, set a current on the device that fits the diameter of the electrode. The electrode should be at an angle of 60-70 degrees to the workpiece, and then hold it over the metal, but with a distance of about 3-5 mm. Then you only need to train to learn how to get a steady arc.
After that you need to learn how to build up a roller. To do this, move the electrode smoothly along the welding seam (horizontally). It is necessary to produce oscillatory movements (amplitude of 2-3 mm), thus “raking up” the molten metal directly to the crater of the arc.
The last action is slag removal with a hammer. You just need to knock on the seam. That's all, now you know how to do the welding, which means you can start it yourself.
The principle of spot welding: electric current of a certain force is supplied through the metal surface of the welded elements and electrodes, thanks to which the metal is melted and heated. Therefore, at the point where the metal and the electrode are in contact, the core of the welding point is formed, and the parts themselves are fastened very securely.
Before you do spot welding, you need to consider that when welding elements, each electrode is affected by precipitation pressure, and this is the condition that the service life of the electrodes is reduced. It often happens that the strength of each welding point, as well as the entire joint, is determined by the diameter of the core of the welding point, and the diameter, in turn, depends on the thickness of the metal that is welded.The strength is also influenced by the strength of the current that passes through the electrodes, the pressure, and the time it takes the current to act on metal surfaces.
Where is welding used
The scope of welding is quite extensive and you can select some things that can be done by welding. This may be the elimination of sewage leaks, pipes for heating and water supply, to close up the aquarium that has cracked, glue the faience to the broken sink and much more.
Contact butt welding resistance can connect wires (diameter up to 8 mm), rods (diameter up to 20 mm), pipes (diameter up to 50 mm), make chains, rings and frames.
With the help of flash butt welding, it is possible to join compact sections (square, circle), make cutting tools, weld pipes and rails.
Using resistance welding, connect parts from metal sheets, weld parts of an aircraft, jet engines, and household appliances.
Relief welding is used when there are joints with natural reliefs (bars of reinforced concrete reinforcement crosswise) in the manufacture of brake pads for a car.