AIT S-21 Resistance Welding Electrode

The S-21 series is a fully customizable spot welding round electrode available in multiple materials.  See the drawing for an understanding of the various dimensional values and construction of this electrode.  It comes with a .125” or .250” diameter copper body.  Glidcop and copper versions are built from one piece, and essentially any A value larger than .025” diameter is acceptable in these two materials.  Tip materials of class 11 copper-tungsten, class 13 pure tungsten (W), and molybdenum (M) have the tip pressed into the shank, with standard A values for pressed materials being .062” , .093” , and .125” .  Other A values requested in pressed materials will be constructed by inserting a standard A diameter material size, and then resizing the end of the tip.  Please note that requesting non-standard A dimensions with class 11 copper-tungsten, class 13 pure tungsten, and molybdenum materials will add additional cost to the base price of the electrode.  Adding a –B to the end of the part number makes the tip brazed into the copper shank.  Adding a -P to the end of the part number makes the tip pressed into the copper shank with no brazing. Tip sizes with an A value larger than .125 are always brazed onto the copper shank.  While brazing the tip material into the shank adds some additional cost to the electrode, we highly recommend using this option, as it produces a superior electrode.  An electrode with a pressed tip and no brazing has the potential for the resistance to change due to oxidation of materials at the joint between the tip and shank.  This can lead to inconsistent welding results.  Custom materials are also available. Contact the factory for assistance at (870)-269-4367.