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Hello, my name is Chris Rogers. Welcome to my website about modern construction practices. Through the decades, the process of erecting a large-scale building has changed in many ways. Construction professionals have much more access to helpful, purpose-built tools that get the job done faster than ever. Construction experts also utilize huge pieces of machinery to move dirt, place materials and perform other important actions on the job. I welcome you to visit my site daily to learn all you can about modern construction techniques. Once you have this knowledge by your side, you will have the opportunity to marvel at the cityscape sitting before you. Thanks.

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Learning About Modern Construction Practices

An In-Depth Look At CD Stud Welding

by Celina Simpson

If you need to install metal fasteners on-site, you might find it to be a bit of an uphill battle when using traditional techniques. Drilling and tapping requires a thicker base metal, plus it takes a long time to drill through the material. Inserts and through-bolts can work themselves loose and leave unsightly rust stains. Back welding the fastener in place also takes time and plenty of finishing to leave behind an acceptable appearance.

If you're looking for a simpler and quicker way to install metal fasteners, you may want to take a look at CD stud welding systems and the wide range of advantages they offer over the above.

What is CD Stud Welding?

Capacitor discharge (CD) stud welding shares plenty of similarities to its arc stud welding counterpart, but with one noticeable exception. As its namesake suggests, CD stud welding relies on a capacitor storage system that produces a rapid electrical discharge to fuse the stud to the base metal. The capacitors can be charged to a designated voltage according to the diameter of the stud that requires welding.

A stud pip is used to help create a gap for creating the required arc. This also means that no flux is needed for the welding process. Upon discharge, the pip melts and the weld gun uses a spring-loaded action to force the stud onto the surface. This action mates the stud to the molten metal surface until the metal solidifies.

Why Does the Industry Use It?

There are three main advantages associated with CD stud welding:

  • Speed – The capacitor discharge method of stud welding literally happens in the blink of an eye. In a recent article in Assembly Magazine, Blake Hobson noted that the average weld times for a typical CD stud weld process ranged from 2 to 12 milliseconds. Compared to the 50 milliseconds to 1.5 seconds needed to complete a typical arc weld, CD stud welding allows for faster and more productive movement.
  • Shallow penetration - Deep penetration can be a negative attribute for welding with thin metals, especially given the potential for distortion and discoloration of the base metal. Whereas a typical arc stud weld features penetration depths as high as 0.125 inches, a CD stud weld offers a penetration depth as shallow as 0.002 inches.
  • Cosmetic appearance - CD stud welds are usually preferred in industrial applications where an attractive appearance is desired. These welds can be performed with minimal burn and without reverse side dimples. This means that the reverse side of the base metal can be pre-painted without fear of damaging the surface during a weld.

Are There Any Downsides?

In spite of the many advantages of CD stud welding, it's not feasible for every application that requires a stud weld. For starters, CD stud welds are relatively limited in size, ranging from 1/8-inch to 3/8-inch in diameter. Jobs that require a larger diameter weld must be done through arc stud welding.

In addition, CD stud welding may not be ideal for jobs where structural quality takes precedence over cosmetic appearance. Given the relatively shallow penetration depth of a typical CD stud weld, you may want to opt for arc stud welding, which offers a deeper penetration depth and greater structural strength.

Choosing the Right Process for the Right Job

Deciding which process is best for your needs really depends on the stud welding application itself. For instance, arc stud welding is ideal for applications that require large diameter studs to be mated onto thicker and rougher base metals. Meanwhile, CD stud welding is the preferable choice for welding smaller diameter studs on thin base metals vulnerable to distortion and discoloration.

In the end, it's up to you to weigh both the advantages and disadvantages of each process to decide which one works best in your case. 

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