CWI Practice Exam (100% correct and graded A+)

Welding - Answer-the joining of metals at their molecular level; manipulating heat Pulse welding - Answer-by forming one droplet of molten metal at the end of the electrode Then, just the right amount of current is added to push that one droplet across the arc and into the puddle. The transfer of these droplets occurs through the arc, one droplet at a time 4 Components of a Weld - Answer-Metal, Heat Source, Filler Metal, Shield from Air 4 ARC Welding Processes - Answer-stick, mig, tig, plasma cutting ARC Welding - Answer-type of welding where electricity jumps an air gap Electricity - Answer-electrons moving from one atom to another Electron - Answer-negatively charged portion of an atom, orbits around the nucleus Conductor - Answer-anything that allows electricity to flow easily through it, the further away the electrons the better conductor Insulator - Answer-more difficult for electricity to flow through Semi Conductor - Answer-middle ground between insulator and conductor Amperage - Answer-how many electrons are moving Voltage - Answer-cause of electron movement, adjusting heat Ohms - Answer-resistance involved, adjusting the gapWelding Hazards - Answer-Personal Protection, Fumes, ARC radiation, electrical shock, fire, burns, explosive gases Galvanized Metal - Answer-coated in zinc, dangerous to weld Electrode - Answer-a metal rod having approximately the same composition as the metal to be welded AC - Answer-Alternating current, back and forth, most common DC - Answer-direct current, can go either straight or reverse Purposes of Flux Coating - Answer-cleansing and deoxidizing agent, release an inert gas for protection from atmospheric oxides and nitrides, form slag over deposited metal to protect weld, easier starting, stabilizing the arc, reduced splatter, better penetration First 2 digits of Electrode - Answer-signify strength in thousands of pounds per square inch