Weld Stud Concrete Anchors

Also known as a Headed Concrete Weld Stud, a Weld Stud Concrete Anchor is unthreaded and includes an upset head. The fastener is commonly used for anchoring steel plates and shapes into concrete structures.

The stud anchors can be made of mild steel, stainless steel, aluminum alloys, brass, copper, gold, silver or any of a number of alloys. The stud affixes to a metal work piece instantly and achieves a high quality, high strength permanent bond. The welded fastener and base metal need not be of the same material. Brass to copper, copper to steel, brass to steel, and other corresponding combinations can be welded together.

Benefits of using this type of fastener include:

  • Speed. It takes less than a second to fix the stud to metal material.
  • The stud is single sided. There is no need to access the opposite side.
  • It is strong and creates a full cross section weld.
  • It is stable. So it won’t work free like pres-in fasteners can.
  • There is no weld splatter.
  • Weld studs are versatile fasteners that can be used to fix airlines, machine guards, handles, fireproofing material, insulation, wiring, looms, and more.
  • It is ideal for when the reverse side of an assembly is not accessible. Access is only necessary on one side.

The process of stud welding includes the use of a ceramic ring that focuses generated heat, prevents oxidation and holds the molten metal in the weld zone. Once the weld is complete, the ring, also known as the ferrule, breaks off of the fastener when the weld is complete. The deficiency of marring on the side opposite the fastener is what distinguishes this fastener from all others. Drawn Arc stud welding assures strong, one-sided welds on base materials with a thickness of at least 0.058-inches or 1.2 mm.

The length listed in descriptions of the anchor is before the weld occurs. Stud diameters less than 5/8-inch will actually be 1/18-inch shorter after welding is complete. Stud diameters of 5/8-inch to ¾-inch will be about 3/16-inch shorter. Stud diameters of 1-inch will be about ¼-inch shorter after the weld is complete.

Weld stud anchors are used to secure nameplates to office doors. The studs weld without messing up the polished brass finish of the nameplate.

Weld stud anchors are also used to secure elevator switch panels. They eliminate the need for screws. Weld studs hold the switches from the rear of the panel. Since there is no marking on the front panel, the connection looks neat.

Weld stud anchors are also used to secure bridges to a metal expansion joint. The connection consists of a metal plate on either side of the gap between the highway and bridge. The weld studding also assures that the bridge doesn’t buckle as it expands in hot temperatures. The anchors are also used to secure lighting fixtures. They are also used to construct ships and in many construction applications

Installing Weld Stud Concrete Anchors

Stud welding is a term that describes a number of different methods of securing bolts, studs, and other fasteners to a metal work piece. This process is faster and easier than drilling and tapping.

The most common method of stud welding is to apply intense heat to the parts that are to be connected for just a brief period of time. The surfaces that are to be joined melt and then the bolt or stud is pressed into place with a special welding gun. This process can be used to install steel bolts or studs up to a maximum of 25 mm in diameter. The process can also be used on stainless steel, copper and brass. Aluminum can be welded using a capacitor discharge technique.

Besides the stud welding gun, the process also requires a number of other tools including a power unit and control equipment for striking the arc and controlling the different procedures. A conventional power unit can be used or a group of capacitors that offer very fast discharge after charging.

The capacitor Discharger welds studs with a small stud on the head. That stud burns away and ignites the arc. The process is suitable for welding on to thin metal pieces because there is little dispersal of heat to the surrounding metal. This assures that the surface finish or treatment on the reverse side is not damaged.

Fixing material in construction applications is not a one-process undertaking. There are a number of fasteners one can use as well as a number of ways to install them. The staff at AbraFast knows what fastener works best for what applications and can also advise you in the method of installation. Call (630) 882-9010 with any questions you have on what fasteners to use and how to install them.