Some common welding machine problems and their solutions include: Inconsistent arc: Check for a loose connection or damaged cables and replace as needed. Ensure the correct voltage setting for the material being welded. Porosity in welds: Clean the base material and ensure proper gas flow and shielding gas mixture. Poor penetration: Adjust the amperage and travel speed and ensure proper welding technique.   For more complex issues, consult the equipment manual or contact a professional technician.