MIG Weld Study Guide Questions and Answers 100% Verified

After an arc is struck, what protects the molten puddle from contamination due to elements in the air? - ️️Shielding Gas Cover What are the three things that have to adjusted to be in balance on a MIG welding machine? - ️️Voltage Control, Wire Feed Speed, and Shielding Gas Flow Rate. What does each digit of the electrode number stand for? - ️️E - electrode, R - rod, First two digits - tensile strength (by 1000 pounds), S - solid bare wire, Last digits - chemical composition variations of electrodes. What does MIG welding stand for? - ️️Metal Inert Gas List at least 3 advantages of MIG welding. - ️️Don't have to start an arc, no slag, and no changing out electrodes. Why is cleaning of a weld and prep time cut down with MIG welding? - ️️No slag and no worrying about electrodes. Are MIG welders alternating current (AC) or direct current (DC) machines? - ️️Direct Current (DC) What does voltage affect with MIG welding? - ️️Voltage will change very little with large changes in current. What is burnback? - ️️A situation in which an electrode wire is fused to the contact tip. The MIG gun can also be thought of as an ______________ holder. - ️️electrode What is an inert gas? - ️️A substance whose atoms are stable and will not react easily with atoms of other elements. What are the different types of gasses that can be used in MIG welding? - ️️Inert and Non-Inert Gas In MIG welding, what is the electrode? - ️️The Wire What factors need to be considered when selecting electrode wire? - ️️Types of Material to be welded, Joint Design, Surface Condition, and Service RequirementsDefine ductility - ️️The ability to be fashioned into a new form without breaking. MIG electrode wire is classified by which association? - ️️American Welding Society (AWS) What is globular transfer? - ️️A pattern in which the molten metal from the wire electrode travels across the arc in large droplets.