Welding 1 Module 4 exam questions and answers

(A-CAC) A jet of compressed air passing through the electrode holder and its head blows the molten metal away. All positions This (A-CAC) process can be used in _______________ on any metal that will conduct electricity, such as carbon steel, stainless steel, cast iron, and copper, as well as their alloys. gouge weld grooves, back-gouge welds, defective welds, cracks for welding It is primarily used to ___________________, ______________, ______________, and to prepare ________________. higher The currents used in A-CAC electrodes are much _____________ than those required for comparably sized shielded metal arc welding electrodes. AC or DC Either ___________ constant current welding machines may be used to supply power to A-CAC torches, but DC welding machines are usually preferred. Plain for direct current )DC) These electrodes for DC use DO NOT have a copper coating. Copper-Coated for direct current (DC) Copper coated electrodes for DC use are THE MOST COMMON. Copper-coated for alternating current (AC) Copper coated AC electrodes differ from copper coated DC electrodes because they contain RARE -EARTH MATERIALS that help stabilize the arc. Flat Electrodes _________ are specified by the widths of their widest side. Round Electrodes __________ are specified by diameter. Carbon Arc electrode are completely dry ______________ one of the procedures to prevent fires or explosions during A-CAC work is to make sure separate air hose and electrical cable Some torch cables contain a _______________ within a common jacket. concentric cable system Other torch cables use a special _______________ that routes the compressed air through the center of a hollow electrical cable. Flame resistant shields or curtains ____________________ must be erected to protect any workers or equipment within the range of the molten metal. shallow gouge For a _____________ the electrode is advanced at a rapid rate. increase/decrease To _____________ the groove depth, _______________ the advance speed or increase the current setting. Notches ____________ left in a base metal have a tendency to trap slag during welding. Dross or carbon deposits ________________ left on a surface to be welded will combine with the base metal to form hard, brittle zones and porosity in the weld zone