그만큼 솔루션 to the 온도 out of control of the 전기 납땜 철
A common failure with thermostatic soldering irons is temperature runaway, which results in overheating of the soldering iron. On the one hand, it leads to high-temperature oxidation of the soldering iron tip (solder is also oxidized at the same time); on the other hand, soldering at high temperature is also easy to burn out electronic components. When the electric soldering iron works at high temperature for a long time, it is also easy to cause damage to its internal circuit, resulting in permanent loss of control or even inability to use it. During the fault inspection, it will be found that the sliding contact of the temperature regulating resistor R2 is oxidized and has poor contact, which is equivalent to the temperature being adjusted to the maximum upper limit, so the temperature of the soldering iron is too high. There are two fundamental reasons: one is that when the electric soldering iron is working, a part of heat is transferred to the handle of the soldering iron (built-in circuit), which increases the temperature of the circuit working environment. After a period of time, it is easy to cause the movable contact of R2 to oxidize; the second is that the current-limiting resistor R1 in the rectifier filter circuit dissipates heat, which causes the temperature of the circuit working environment to rise and easily causes the movable contact of R2 to oxidize.
(1) 교체 조정 가능 저항기 R2 with a 고정 저항기: first adjust R2 to make the temperature of the soldering iron reach the optimum temperature point for normal use, then measure the value of R2 and replace it with a fixed resistor.
(2) 변환 의 the 정류기 회로: the circuit structure is shown in the figure.
Replace R1 with C (C≈0.12μF), and connect a diode D1 in parallel.
방법 개선 용접 품질 전기 납땜 철
1. 언제 사용 an 전기 납땜 철 for 용접, it is necessary to ensure that each solder joint is firmly welded and in good contact to ensure welding quality.
2. Good solder joints require bright tin spots, smooth and burr-free, and moderate tin content. Tin and solder are firmly fused. There should be no false welding and false welding.
3. Pay attention to prevent the problem of false welding and false welding: virtual welding means that only a small amount of tin is welded at the solder joint, resulting in poor contact, sometimes on and off. False welding means that it seems to be welded on the surface, but in fact it is not welded. Sometimes the lead wire will be pulled out from the solder joint when it is 당김 아웃 바이 핸드.
Only after a large number of serious welding practices can these two major problems be avoid .
4. When soldering the circuit board, the time must be controlled. If the time is too long, the circuit board will be burnt, or the copper foil will fall off. When removing components from the circuit board, stick the tip of the electric soldering iron on the solder joint, and pull out the component after the tin on the solder joint melts.
5. 플럭스 (로진 및 납땜 오일) is the key to welding. 신선함 로진 및 비부식성 납땜 오일 아레 도움이 되는 for 고품질 용접, and can make the surface clean and beautiful. 사용 다목적 플럭스.
