The invention describes a welding apparatus ( 1 ), which has a current source ( 2 ) for supplying electrical power to at least one electrode at a welding torch ( 10 ) and a control system ( 4 ) co-operating with the current source ( 2 ), linked to an input device ( 22 ) for entering settings for different welding parameters, several sensing means being provided for detecting various actual values of a welding process. At least one measuring device or system for sensing mechanical motion, in particular a welding wire displacement and/or a welding torch displacement or similar, is provided, which detects a surface structure of an object.
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