jootmine tehnoloogia of trükkplaadid peamiselt kasutusalad tina plii jootmine jootmiseks , lühendatud nagu tina jootmine.
Keevitamine mehhanism trükkplaat : all toime keevitamine kuumus - 2c jootmine - 2c keevitamine vask foolium kas ei sulamine märg keevitus pind , tuginemine sisse liikumine aatomid ja molekulid molekulid vahel jooteline ja vask foolium 2c mis mis põhjustab difusioon metallide metallide vormini a sulam sulam kiht vask foolium ja keevitamine - 2c ja ühenda vask foolium ja keevitamine saada a tahke - ja -töökindlus keevitus punkt.
To saavutada jootmine trükkplaadid , jootmine tööriistad on hädavajalikud. Allpool on jootmine tööriistad trükkplaadid ja nende kasutamine meetodid.
Trükk plaat keevitus tööriistad peamiselt sisaldavad: elektriline jootmine raud, joodis ja voog, ja abiseadmed tööriistad.
1. Elektriline jootmine triikraud
Electric soldering iron is the most important welding tool in circuit board welding. The structure of different electric soldering irons is also different. Externally heated electric soldering irons are generally composed of soldering iron head, soldering iron core, shell, handle, plug, etc. The soldering iron head is installed inside the soldering iron core and is made of copper alloy material with good thermal conductivity as the substrate; An internally heated electric soldering iron is composed of five parts: a connecting rod, a handle, a spring clamp, a soldering iron core, and a soldering iron head (also known as a copper head). The soldering iron core is installed inside the soldering iron head (with fast heating and a thermal efficiency of over 85 percent - percent percent ). There are many types of electric soldering irons, which can be divided into direct heating, induction, energy storage, and temperature regulation methods; The power can be divided into various types such as 15W, 2OW, 35W, and 300W.
The temperature of the solder head of a low-power electric solder solder is general between 300~400 degree . Üldiselt rääkimine, the higher the power and heat of an electric jootmine raud, the higher the temperature of the jootmine raud pea.
Keevitamine integreeritud vooluringid, trükitud trükkplaadid , ja CMOS vooluringid üldiselt kasutamine a 20W sisemiselt kuumutatud jootmine triikraud. The higher the power of the soldering iron used, the easier it is to burn out the components (tavaliselt when the temperature of the transistor junction exceeds 200 degree , it will burn out) and cause the printed circuit board wires to dech from the substrate; the power of the soldering iron used is too small, the soldering tina cannot be fully melted, the flux cannot be lenduv, and the jootmine liigesed on mitte sile ja kindel , mis on kalduvus vigane jootmine.
2. Tina ja voog
Kui keevitamine, joodis ja voog on ka vajalik.
Tin material: It is a fusible metal that can connect component leads to the connection points of printed circuit boards. Tin (Sn) is a soft and ductile silver white metal with a melting point of 232 degree . It has stable chemical properties at room temperature, is not easily oxidized, does not lose its metallic luster, and has strong resistance to atmospheric corrosion. Lead (Pb) is a relatively soft light blue white metal with a melting point of 327 degree . High purity lead has strong atmospheric corrosion resistance and good chemical stability, but it is harmful to human health. Adding a certain proportion of lead and a small amount of other metals to tin can make solder with low melting point, good flowability, strong adhesion to components and wires, high mechanical strength, good conductivity, low oxidation resistance, good corrosion resistance, and bright and beautiful solder joints, commonly known as solder. Solder can be divided into 15 grades based on its tin content, and into three grades: S, A, and B based on its tin content and the chemical composition of impurities. Welding electronic components usually uses wire shaped solder wire with a rosin core. This type of soldering wire has a low melting point and contains rosin flux, making it easy to use.
Joote voog: jagatud kaheks tüübiks vastavalt to funktsioon: voog ja joodis takistus.
① Voog
② jootmine vastupanu
Joote blokeerimine voog purk katmine tahvel pind of trükktrükk trükkplaadid see mitte mitte vajadus to joodetud, so see joodis saab ainult olla joodetud on sisse nõutav joodis vuugid, mis saab kaitsta paneel eest väike kuumutamine löök keevitus ja on mitte lihtne to blister, ja saab ka ennetada silda, ots tõmbamine, lühis vooluring, vigane jootmine, joodis, jootmine, jne.
Kui kasutamine voog, see peab olema korralikult rakendatud vastavalt to the area size and Surface olekud of the keevitus. If the amount is too small, the welding quality will be affected. If the amount is too large, the flux residue will corrode the components or make the insulation performance of the circuit board worse.
