The resistance weld is suppose to get hot as part of the process. The electrodes should not get hot. If they are heating up it is either poor water flow or incorrect weld schedule settings. The water flow should be two liters per minute for the upper and lower each. Ninety percent of the time the water flow is the issue for hot electrodes.
Hot electrodes can cause other issues. They will retard the current flow and cause weak welds. They will mushroom and decrease the current density causing again weak welds. They will also need to be replaced more often and this causes down time and loss of production. If you have overheating electrodes finish the batch or production run and then try to figure out why they are overheating.
Some electrodes will perform better than others. This difference is mostly due to certian alloy combinations, methods of manufacturing, and surface conditions. They were also designed with certian applications in mind. If the electrode, cap, or shank are over heating there is a very small chance it could be a problem with the electrode or the use/application. Every time we have found truly "bad electrodes" they were gyp-tips made from common copper and substituted into the machine. This is penny wise and pound foolish. Refer to the catalogs on electrodes for detailed information.
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