When the cold pressing terminal is connected, tin can not be applied. The main reason is that the crimping of the wire head is not solid, and if the tin is not strong enough, tin can not be applied. If special crimping pliers, hydraulic pliers, stamping and other processes are used, tin coating can not be used, because tin will make the multi strand wire brittle, but especially thin multi strand wire must be tin coated, tin will make the wire strong.
If there is no regular tool for crimping, tin can only be applied in order to ensure the starting time. Tinning is to increase the contact area and reduce the contact resistance. For the wire connection with low requirement and low current, tin coating is not required. For thicker wire connection, the cold pressing terminal can be pressed and tinned, and then connected with bolts.
There are several connection methods of cold pressing terminal, one is solder type, which is the continuity of metal between the tin wire and the surface to be welded. Therefore, the solderability is important for cold pressed terminals. Tin alloy, silver and gold are common coatings on the welding end of cold pressed terminals.
The other is piercing connection, which has the characteristics of high reliability, low cost and convenient operation, which is suitable for the connection of ribbon cable. During connection, it is not necessary to peel off the insulation layer of the cable surface, but to rely on the "U" shaped touch spring of the connector to pierce into the insulation layer. The conductor of the cable slides into the slot of the touch spring and is clamped, thus forming a tight electrical connection between the cable conductor and the connector spring. This method only needs simple things, but it is necessary to choose the cable with regular wire gauge.
There is also a riveting connection, which is a skill that allows the metal to shrink and shift within a regular limit and connect the wire to the touch pair. Generally, good crimping connection can lead to mutual melting of metals, which makes the conductor and touch data symmetrically deformed. This kind of connection is similar to cold welding connection, which can obtain better mechanical strength and electrical continuity, and can withstand worse environmental conditions.
At present, it is generally believed that choosing the right crimping connection is better than soldering, especially in the case of large current. Special crimping pliers or active and semi-active crimping machine shall be selected for crimping. We should choose the right conductor barrel according to the cross section of the conductor. Attention should be paid to the connection when crimping, but it can only be used once.
The direct plug-in type is also the connection mode of cold pressed terminals. When using this kind of cold pressed terminals, the connection pins of the terminals are generally selected to be longer, so that they can be inserted into the holes at the corresponding plate ends, and then soldered by dipping tin.
In the terminal, the touch force is one of the basic elements.