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    1.1 Apply flux to the solder pad before soldering, and use a soldering iron to prevent the solder pad from being tinned or oxidized, resulting in poor soldering. The chip generally does not need to be processed.1.2 Carefully place the QFP chip on the PCB with tweezers, taking care not to damage the pins. Align it with the pad to ensure that the chip is placed in the correct orientation. Adjust the temperature of the soldering iron to more than 300 degrees Celsius, apply a small amount of solder to the tip of the soldering iron, use the tool to press down on the chip in the aligned position, an...
    发布时间: 2018 - 07 - 12
    Grip of the soldering iron: There are three types:1) The anti-grip method is to hold the handle of the soldering iron in the palm with five fingers. This method is applicable to high-power soldering irons, and is connected to the welded parts with large heat dissipation.2) Positive grip method, the electric soldering iron used in this method is also relatively large, and most of them are curved soldering iron tips.3) Holding the pen method, this method is suitable for low-power electric soldering iron, welding parts with low heat dissipation, such as welding radio, printed circuit board of TV ...
    发布时间: 2018 - 07 - 12
    Mobile phone repair soldering station lead-free soldering iron head maintenance and maintenance1. Soldering 63% to 37% lead should be used when soldering the appropriate tin wire, and the soldering iron tip is often protected with a tin layer. In addition, we should try to use thicker tin wire for welding work, because the thicker tin wire butt welding head has more...1. Use the appropriate tin wireSolder should be used with 63% to 37% lead in soldering and often with a tin layer to protect the soldering iron tip. In addition, the thicker tin wire should be used as much as possible for the wel...
    发布时间: 2018 - 07 - 12
    From April 12th to 15th, the 15th China International Electronic Production Equipment and Microelectronics Industry Exhibition (NEPCON2005) was held in Shanghai as scheduled. With the participation of 700 exhibitors from 21 countries and regions, this exhibition became China. The most influential event in electronics manufacturing.From the perspective of exhibitors and seminars, lead-free, SMT placement machines and soldering have become the three hot spots of this exhibition. Among them, lead-free throughout the entire exhibition, from the basic solder to the lead-free upgrade of electronic e...
    发布时间: 2018 - 07 - 12
    Lead-free solder contains no lead and has a higher melting point than conventional (63% tin + 37% lead) solder.Common lead-free solder:· Sn-Ag (tin + silver, 96-98% tin)· Sn-Cu (tin + copper, 96% tin)· Sn-Ag-Cu (tin + silver + copper, 93-96% tin)· Sn-Ag-Bi (tin + silver + tantalum, 90.5-94% tin)· Sn-Ag-Bi-Cu (tin + silver + 铋 + copper, 90-94% tin)The 63/37 lead solder bath has a melting point of 183 ° C and the freezing point is also 183 ° C. Note: This solder does not appear colloidal [the same temperature point from liquid cooling to solid (or vice versa)]....
    发布时间: 2018 - 07 - 12
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