Offset holders are very commonly used in industry on press welders to reach over a lip or into a box. This is where there is no vertical room for a direct acting barrel holder.
Barrel holders are the most common holder used for standard press welders. They came in several barrel diameters ranging from 5/8 – 1 ½”. The most popular size is 1 ¼” diameter. Standard lengths are 8 and 12”.
Welding guns use special copper alloy arms/adapters which function as electrode holders. They attach to the gun on one end and have a cap taper at the other for the electrode.
Repeat or pulsing refers to repeating the weld and hold portion of a weld schedule. Normally there is a very short off period of one or two cycles with continued application of force between the two weld sequences. This gives you the ability to dissipate the heat energy a little further into the part away from the center of the weld nugget.
Aluminum has a tendency to form voids or cracks in the weld nugget as it solidifies. These voids are generally not desirable. In many cases this condition can be improved with good force follow up or application of a secondary forging force near the end of the weld cycle.
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