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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.
If the weld equipment is not properly cooled especially the electrodes weld failure is likely to occur. Poor cooling at the electrodes can cause them to mushroom prematurely which reduces the current density at the weld face and the nugget size will reduce. Poor cooling can be caused by low flow, warm water, improperly located cooling tubes, clogged/restricted tubes and no flow.
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