IGBT’S are the switching devices in inverter controls. They handle large amounts of power during resistance welding and can heat up. Yes, they must be cooled. They are normally mounted on a water cooled plate to remove the heat. IGBT's are indirectly cooled with this mounting system.
For AC welding it is important to operate at a relatively high percent heat. This gives you the maximum efficiency and minimum off time during each weld cycle of the sine wave. So your weld schedule should be designed to optimize this situation as opposed to a high tap and a low setting where a large percentage of the time (each cycle) there is no current flow and the weld is actually cooling down.
High frequency welding offer many advantages. Weight reduction and reduced power requirements are just part of the advantage. These advantages can add up in a large plant with many weld cells.
High frequency welding offer many advantages. The inverters found in many plants today offer both weight and power reductions. These changes can add up in a large plant with many weld cells.
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