The reasons are as follows:
1, can prevent the copper core cable fork, causing accidents.
2, can reduce the contact resistance of the joints, increase the tensile strength of the joints.
3, play the integration of current, to prevent the missing wire contact surface caused by overcurrent heating burned devices.
We all know that the resistance of the conductor under the action of the current will make the conductor heat, and the larger the current, the higher the heat will be, and the role of shabu-shabu process is to reduce the heat.
Tin film with a low melting point will be formed after the wire ends are "hot tinned". When such wire ends are used to press-fit the wire noses, the tin film will be melted under the high pressure of the hydraulic crimping pliers and fully fill the gap between the wire ends and the wire noses;
At the same time, the melted tin will be impregnated with the inner wall of the wire noses, which will make the wire noses more durable and easier to install. The two roles of the press-fitted wire contact resistance is minimized, the heat will be minimized, it is not easy to produce accidents, at the same time, prolong the service life of electrical appliances (such as air openers, contactors, etc.).
Expanded information:
The reason for the heating of the joints:
Some electrical installation workers in the laying of electrical wires, often do not pay attention to the quality of the installation:
In should be used in the insulating casing is not installed casing; should be used in the place of the junction box also did not install the junction box; even in the wire joints is not the use of articulation method, but the use of unauthorized bending hook-like connection method.
The contact resistance of this hook-like connection method is very high, and the constant heating when energized will make the nearby boards gradually dry and char, and finally burn, causing a fire.
Heating wire joints will not only cause a lot of power loss, but also seriously affect the normal work of electrical equipment;
Light line in the work of the current increases, shortening the life of the electrical equipment, the heavy will be a sudden interruption of the ongoing production, scientific research, medical surgery and other activities, but also caused by fires and electrocution accidents and so on, resulting in incalculable losses.
Baidu Encyclopedia - Cable Joints