Plug-in self-recovery fuse is a kind of over-current electronic protection element, which is made of polymer organic polymer under the conditions of high pressure, high temperature and vulcanization reaction, adding conductive particle material and processing by special process. Because of the special material of plug-in self-recovery fuse itself, the product itself is very sensitive to temperature. As the temperature rises, its resistance value rises and reaches an excessively high temperature (above 300℃). Because the expansion coefficient of the matrix itself is inconsistent with that of the external sealing layer, the sealing layer expands and the corresponding resistance value increases. Therefore, during the welding process, special attention should be paid to the welding temperature, welding position and welding time of plug-in self-recovery fuse. So what should be paid attention to when "welding" the plug-in self-recovery fuse? The following is compiled by Shunhai Science and Technology Xiaobian, and the specific related contents are referred to.
Note 1 for "welding" of plug-in self-recovery fuse: the welding temperature shall not exceed 280℃. Especially for small-sized plug-in self-recovery fuses, the temperature must be controlled. Because of its small size and poor heat dissipation at high temperature, the product is easy to crack and the resistance becomes larger, but as long as the temperature is controlled well, this phenomenon will not occur;
Note 2 for "welding" of plug-in self-recovery fuse: the welding position should be 6 mm away from the sealing foot, because direct welding to the sealing foot will cause the sealing layer to heat up sharply, resulting in product cracking and increased resistance;
Note 3 for "welding" of plug-in self-recovery fuse: the welding time should be kept within 2-3 seconds, and too long time will lead to product cracking and resistance increase;
