TIG welders such as the Lincoln Square Wave 200 are more difficult to use as compared to the MIG welders. This is mainly because you will need to control three things which are the torch foot pedal and the filler rod. However, this is a great thing because you can easily adjust these elements to get specific results.
When using these machines, you use an electric TIG torch with one hand to strike an arc using a filler rod on the other hand. This allows you to feed the filler metal in the weld pool. There is also a foot pedal which helps in controlling the amperage produced by the welder. You can pedal to change the amperage after you have set the maximum amperage on the machine. If you want to get the maximum amperage, you should hold down the pedal. Due to this flexibility, you are able to start your welding slowly to prevent thermal shock on the metal. When setting up the machine, you should always confirm that the ground clamp is properly attached to your work piece.
The TIG torch releases Argon gas into the weld which prevents contamination. However, you should hook up a regulator and a gas bottle for this. You should also ensure that you are using the right welding gas.