The inner-core type welding is an "inside-out" wire with the flux inside a tubular electrode. The equipment needed is simple : a constant-voltage dc power source, a wire feeder and a light weight welding gun, which is like the MIG holder without the gas and cooling attachment. Thus, a continuous welding is possible. Sometimes additional shielding is provided with a gas, and then the process resembles gas metal-arc welding .
The welds are strong and tough. The arc starts easily, and cold wire produces high-quality welds at faster speeds than stick welding even when hand welded.
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