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.. the required current for gas shielded metal arc welding is usually between 100 and 500a the welding process is easy to operate, with no or very little slag, and there is basically no need for slag cleaning after welding under the compression of the protective airflow, the heat of the arc is concentrated, the welding speed is fast, the molten pool is small, the heat affected zone is narrow, and the deformation of the welded part after welding is small.melting electrode gas shielded welding usually uses dc welding power sources, and currently, arc welding rectifier type dc power sources are commonly used in production the rated power of a welding power source depends on the current range required for various purposes.

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