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Mechanical Nexus. Смотреть видео: METAL INERT GAS WELDING MIG GAS METAL ARC WELDING GMAW WORKING OF METAL INERT GAS WELDING, ARC WELDING PRINCIPLE OF ARC WELDING POLARITY IN WELDING DCSP DCRP DCEN DCEP, WELDING DEFECTS WELDING IMPERFECTION CRACK POROSITY UNDERCUT SPATTER SLAG INCLUSION, FOUR STROKE PETROL ENGINE SPARK IGNITION ENGINE 4 STROKE ENGINE WORKING PETROL ENGINE DIAGRAM.