Introduction of welding method for 4 foot light touch switch
Release time：2018-11-03 Clicks： Click
The 4 foot touch switch needs to be welded when it is used. What is the specific way of welding? Let's introduce below.
The so-called four-foot touch switch refers to the four-foot touch switch, which is connected to the circuit board through the welding foot. Four-foot touch switch is a very common light touch switch. It looks like four feet, but in fact it is only a switch. Generally, the top and bottom of the switch are directly connected. It is good to weld two feet in the circuit board welding.
Encapsulation of 4 foot light touch switch
A 4 foot light touch switch, how to encapsulate the key inside the PADS.
Because pads elements and package pins must normally correspond. If it does not correspond, PCB package is first established, then CAE package is established, then PART is established. In the process of part, PCB and CAE are added first. At this time, unused pins are defined as signal pins and tab operations of PART attributes.
Welding of 4 foot light touch switch
Four-foot touch switch can be divided into patch four-foot touch switch and plug-in four-foot touch switch according to the direction of the welding foot. The welding foot direction is perpendicular to the main body of the patch 4 feet touch switch, so that it is convenient to use machine automation welding on the surface of the circuit board. Parallel to the main body is the four-foot touch switch of the plug-in, which needs to be welded behind the circuit board through the circuit board, so that the combination of the device and the circuit board will be stronger.
Here are some welding methods for touch switches.
1. Manual welding one by one, the advantage is to accurately grasp the welding of each component, the disadvantage is that it is too time-consuming and laborious.
2. wave soldering for pins, advantages and low price, save time and effort. Disadvantage: As components become smaller and PCBs become denser, the possibility of bridging and short circuit between solder joints increases.
3. Reflow soldering of patches, the advantage of this process is that the temperature is easy to control, oxidation can be avoided in the welding process, and the manufacturing cost is easier to control. The disadvantage is that solder collapsing also occurs during welding heating, which occurs in preheating and main heating. When preheating temperature is in the range of tens to 100, solvents, as one of the components of solder, will reduce the viscosity and flow out. If the tendency of outflow is strong, solder particles will be extruded out of welding at the same time. If the gold particles outside the zone do not return to the weld zone when melting and melting, the solder balls will also form.