Standard manual welding skills

2022-05-16 88

Basics this is the overview page of manually welded surface mount components. It is part of our surface mount welding may be easier than you think! Series. Manual welding uses iron, solder, solder cores, and sometimes flux components attached to the surface of the circuit board. 

Tool soldering iron temperature control $10 non temperature control iron is really not a good iron. Learn SMT welding. You don't need expensive iron, but you need to be able to control the temperature. Wayne likes an iron here and Ryan is weller wcl100. The knob is moved from 0 to 5 instead of directly controlling the temperature, but we have made a lot of good connections with that little guy. It is relatively cheap at about $50. It has ST3 prompt, which may be much wider than you are used to, but it is actually relatively used for welding. Many people may be more comfortable with ST7 or ST8. The solder is hand welded SMT. We like to use 0.015 ″ 60 / 40 lead solder. If you need some techniques that may be useful with thicker solder, you can use lead-free. Solder wick is one thing. The necessary condition for us to consider manual welding SMT is solder wick. This is also known as tin absorbing weaving. It consists of thin copper wire braided flat, and sometimes has flux in it. It helps to clean the solder. Tweezers fine pointed tweezers are essential for moving and holding surface mount components. We like to work with curved tips. You can get about $5, something decent like these non-magnetic micro bending tweezers. Some people use vacuum pick-up tools to pick up and place components. We don't want it. Flux we don't always use flux when welding SMT board by hand, but some people swear by it. Flux is usually manually welded to SMT, because thin solder usually has less flow, and SMT solder joints often argue more than once, so the small flow there has been used up. Magnifying glass and light you need plenty of light when welding SMT, and you may want some magnification to work. There are 2.5x magnifiers, such as optivisors, with built-in magnifying glass lamp head goggles. When you finish your work, you may want a 10x magnifying glass to check your work. Some even 10x magnifying glass with built-in lighting! Remove the technology with solder. If you want to use it, more than joint, put the braid in the braid and put the braid on your iron plate. (heat flux) braided solder. Use the end of the braid, and if it doesn't seem to work, first, cut off a small piece woven from the spool and use it. Depending on the situation, the heat may be along the braid rather than heating the upper joint area. If the braid is old, the flux may not work. You can add flux to help pressurize the braid. Resistors and capacitors such as welding resistors and capacitors often come as small rectangles with opposite ends. Put these solder pads on the board and add a little solder. Use tweezers to save the components and solder one end. Touch the welding pad iron on the pin. The assembly shall be firmly opposed to the board, and both ends shall be internally padded. Create a fillet between one end of the component and the other. Ideally, there is no solder at the end of a large drop. If so, use solder wicks to remove excess solder. Wave soldering SOICs and other things use extended legs. The common large surface mount chip package is SOIC. This represents a small outline of the integrated circuit. Add a little solder to a pad on the motherboard. Use tweezers to line up the chip with the motherboard pad. Using tweezers, press down the chip on the chessboard into the solder, apply a little pressure, and then touch the pad iron on the pin. The chip should be firmly opposed to the board, and all pins should be internally padded. You can heat the pad a few more times to get the chip pushed all the way down and the pad in line. Pin (or lock) the other pin of the chip on the other side of the solder. Solder the remaining pins. When you are finished, check the motherboard. Repair any solder bridges. Small bridges can be easily fixed with solder only by heating the associated pins and drawings, and larger bridges can be easily fixed with solder. Or, if you don't want to solder one of each pin after you've nailed the chip in place for a while, add a lot of solder pins and pads. Then, use solder wick to clean it. Drag welding drag welding is another technology for fast welding of multiple fixed packages. The idea is to fix the chip with a nail of solder, apply it to potential customers, flux, and then drag the pin ball. Where the solder will need to go. We found the basic knowledge of a fast video display technology.