Spot Welding
Questions and Answers
In order to minimize weld cost it is often prudent to make several welds with one stroke of the machine. If time is of the essence, this can be done with a dedicated machine design. Multiple cylinders would all operate at nearly the same time. Their timing is usually spaced slightly to reduce power demand. If multiple welds are in a modest space multiple cylinders may not fit. Then specialized multi spot equalizing holders might be the solution.
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.
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