2, crimping. Crimping is a technique for compressing and displacing metal within specified limits and connecting wires to contact pairs. A good crimp connection can produce a mutual melt flow of the metal, which causes the wire and the contact to deform symmetrically to the material. This connection is similar to a cold-welded connection, it can get better mechanical strength and electrical continuity, and it can withstand more severe environmental conditions. At present, it is generally believed that the correct crimp connection is better than soldering, especially in high current applications, crimping must be used. When crimping, special crimping pliers or automatic or semi-automatic crimping machines must be used. According to the cross section of the wire, the correct pair of wire barrels should be selected. Note that the crimp connection is a permanent connection and can only be used once.