Understand The Differences Between Contact Capacitive Discharge Welding And Gap

Posted by Stepped Wedge on November 5th, 2019

The same general methods and principles is applied on both gap capacitor discharge welding and contact capacitor discharge, even though, there are some differences in the procedure that are significant to understand.

You may have seen at image industries, we frequently get queries about which is the best option to consider. To help the customers and those interested in both gap and contact capacitive discharge welding, here is a basic review.

Rapid and short note on contact CD Welding

The method of contact Capacitive Discharge welding starts with the operator positioning the CD studs with the help of welding fit up tools in the right location pulling the trigger on the gun. This is the main causes of an electrical pathway between the gun and the metal piece. Pulling the trigger results in a short circuit, which causes a discharge of the capacitors that vaporizes the tip of stud. This vaporization creates an arc that melts a small amount of the base metal as well as a bit from the bottom of the stud.

While this melting happens, at the same time a spring in the gun thrusts the stud down and into the molten material of the base metal. The melted substantial rapidly cools, welding the stud in place lastingly. The entire process takes 0.012 seconds to complete.

Glance at the short note on Gap CD Welding

With materials especially with softer materials that melt and cool easily and incredibly fast, such as Al (aluminium), the contact Capacitive Discharge stud welding technique is not effective. Gap Capacitive Discharge welding gap gauge can avoid these problems by accelerating the stud quickly into the molten pool. Not just this, in fact, it also lessens the weld time by about half.

With this method, the stud welding fit up tools and weld gun accelerates the stud towards the substrate or work piece with exact timing and pressure. When the trigger is pulled the stud is moved towards the base metal and, as soon as it touches, the power source delivers the energy needed to turn to vapour the slope and build the arc while at the same time fusing the capacitor discharge studs to the work piece.

CONCLUSION

These are the main difference between the Gap CD welding and contact CD welding. By knowing these difference you can use welding gap gauge at the right place and get the fruitful result.