how to solder the illuminated tact switches?

It seems like there might be a slight confusion in your terminology. Typically, the term "welding" is associated with joining metals through processes like arc welding, spot welding, or other techniques that involve melting and fusing metal. However, when working with electronic components like illuminated tact switches, the term commonly used is "soldering."

Soldering is the process of joining electronic components together using a metal alloy called solder. Here's a general guide on how to solder illuminated tact switches:

Materials Needed:

Illuminated Tact Switch: Ensure you have the illuminated tact switch you want to solder.

Soldering Iron: A tool used to heat the solder and make connections.

Solder Wire: The metal alloy that melts and forms a bond between components.

Flux (optional): Helps improve soldering by promoting the flow of solder and preventing oxidation.

Procedure:

Prepare Components:

Lay out the components, including the illuminated tact switch and any other electronic parts that need to be connected.

Heat up the Soldering Iron:

Turn on your soldering iron and allow it to heat up. The tip of the soldering iron should be clean and tinned (coated with a thin layer of solder).

Tin the Tact Switch Pads:

Apply a small amount of solder to the pads on the illuminated tact switch. This process is called tinning and helps improve the thermal and electrical conductivity.

Position the Tact Switch:

Place the tact switch on the circuit board in the desired position. Make sure the switch is oriented correctly.

Heat the Pad and Component:

Touch the tip of the soldering iron to both the pad on the circuit board and the tinned pad on the tact switch. Heat them simultaneously.

Apply Solder:

Once the components are heated, touch the solder wire to the joint. The solder should melt and flow smoothly, creating a solid connection.

Inspect the Joint:

After soldering, visually inspect the joint. It should appear shiny and smooth. If it looks dull or has irregularities, reheat the joint and add a bit more solder if needed.

Repeat for Other Connections:

Repeat the process for all the connections on the illuminated tact switch.

Trim Excess Leads (if applicable):

If your tact switch has long leads, trim them using a wire cutter after soldering to the desired length.

Clean the Soldering Iron:

Wipe the tip of the soldering iron on a damp sponge to remove any excess solder before turning it off.

Always follow safety precautions when soldering, including using eye protection and working in a well-ventilated area. Additionally, refer to the specific datasheet or manufacturer's guidelines for the illuminated tact switch you are using for any specific recommendations on soldering.