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CD welds can produce a really high quality weld if you set up your equipment properly. Here are the four steps you should take to ensure that your CD stud welding equipment and area is set up properly.
#1 Check Your Ground
The first thing you should do is check your ground. When your ground is not set up properly, energy will be lost on the way to your weld and your weld will not be as strong as it should be. Your CD weld process happens in a matter of seconds, making it vital that your ground is consistently strong.
If possible, set up your work area so that you are ground directly to the particular item that you are working on. Remember, if you are working with aluminum, you are going to want to use a double-ground.
#2 Double Check Voltage
The voltage that you need to create a proper CD weld various based upon the diameter of the stud that you are working with. Generally speaking, the greater the diameter, the more voltage that you need to use. Additionally, aluminum studs generally require more voltage than steel.
Your owner's manual should inform you of the correct voltage setting based upon the diameter of the stud that you are working with.
#3 Adjust The Spring Pressure
If you have a new CD welding gun, you should be able to adjust the spring pressure on the gun. Many older CD welding guns do not have this feature. Like with the voltage, for larger studs you are going to want to use more pressure, and for smaller diameter studs you are going to want to use less pressure. When working with aluminum, you are also going to want to use a higher level of pressure due to have fast aluminum cools off.
#4 Clean The Surface
Before you make a weld, you should always make sure that the surface is clean. Anything on the surface can compromise the integrity of the weld that you are attempting to make.
If there is paint on the area that you are going to weld, you are going to want to use high grit sandpaper to remove the paint. You want to use high grit sandpaper so that you don't scratch the surface you are working with; you only want to remove the paint.
If you had other equipment in the area that may have left behind oil on the area where you need to weld, use some acetone to clean the area and ensure that it is free of oil.