Time:2021-12-28 Views：2189 Author：Jinlong Electronics

1. Soldering

The most common type of soldering is tin soldering. The key requirement for a tin solder connection is the formation of metal continuity between the solder and the surface being soldered. Therefore, for terminal blocks and crimp terminals, solderability is critical. The most common platings for the soldering ends of ring terminals are tin alloy, silver, and gold. Common soldering end types for leaf spring contacts include tab type, punched eyelet tab type, and notched tab type; for pin-and-socket contacts, the common soldering end type is the drilled arc-notched type.

2. Crimping

Crimping is a technology that compresses and displaces metal within specified limits to connect a wire to a contact. A high-quality crimp connection enables metal intermelting and flow, resulting in symmetrical deformation of the wire and contact materials. Similar to cold welding connections, it achieves excellent mechanical strength and electrical continuity, and can withstand harsher environmental conditions. It is generally recognized that proper crimp connections are superior to soldering, especially in high-current applications where crimping must be used. Specialized crimping pliers or automatic/semi-automatic crimping machines must be used for crimping. The wire barrel of the contact should be correctly selected based on the cross-section of the wire for crimp terminals and crimp sleeves. It should be noted that a crimp connection is a permanent connection and can only be used once.

3. Wire Wrapping

Wire wrapping involves directly winding a wire around the angular wrapping post of a contact. During wrapping, the wire is wound under controlled tension, pressed into, and fixed at the corners of the contact’s wrapping post to form a hermetic contact. There are several requirements for the wrapped wire: the nominal diameter of the wire should be in the range of 0.25mm~1.0mm; if the wire diameter is not greater than 0.5mm, the elongation rate of the conductor material should be at least 15%; if the wire diameter is greater than 0.5mm, the elongation rate of the conductor material should be at least 20%. Wire wrapping tools include wrapping guns and fixed wire wrapping machines.

4. Insulation Displacement Connection (IDC)

Insulation Displacement Connection (IDC), also known as insulation piercing connection, is an innovative terminal technology invented in the United States in the 1960s. It features high reliability, low cost, and ease of use, and is now widely used in various terminal blocks for printed circuit boards (PCBs), crimp terminals, crimp sleeves, and ring terminals. It is suitable for connecting ribbon cables. No stripping of the cable’s insulation layer is required during connection; instead, the sharp tip of the terminal’s "U"-shaped contact spring pierces the insulation layer, allowing the cable’s conductor to slide into the slot of the contact spring and be clamped. This forms a tight electrical connection between the cable conductor and the terminal spring. Only simple tools are needed, but cables of the specified wire gauge must be used.

5. Screw Connection

Screw connection is a connection method using screw-type terminal blocks. It specifies the maximum and minimum cross-sections of wires allowed for connection, as well as the maximum tightening torque permitted for different specifications of screws.

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