FCAW Graded A+

FCAW Graded A+ **FCAW Processes** What type of FCAW process uses atmospheric shielding provided by the flux material inside the wire? FCAW-S (Self-Shielded) What type of FCAW process requires an external shielding gas? FCAW-G (Gas Shielded) Which type of FCAW process is more portable? FCAW-S (no gas cylinder required) **FCAW Statistics** What percentage of welding done in 2005 was represented by FCAW? Around 50% **FCAW-Electrodes** What benefits do FCAW-G electrodes gain by having an external shielding gas? More alloying elements and fluxing agents **FCAW-Machines** What kind of power source do FCAW machines use? Constant-potential/Constant-voltage How do changes in wire feed speed affect the arc voltage on a FCAW machine? The arc voltage remains constant, and the amperage increases or decreases accordingly **FCAW Arc Parameters** How does increasing voltage affect the arc length? It increases the arc length How does decreasing voltage affect the arc length? It shortens the arc length **FCAW Welding** How does a constant-potential welding machine maintain the arc length? By keeping the voltage constant, changes in wire feed speed cause changes in amperage to maintain the same arc length **FCAW-Flux** What protects the molten weld pool from the atmosphere? The flux inside the electrode provides protection from oxygen and nitrogen What improves weld strength through chemical reactions and alloys? The flux inside the electrode also improves strength through chemical reactions and alloys What elements are added to the flux to improve weld shape, hardness, strength, creep resistance, and corrosion resistance? Carbon, chromium, and vanadium What elements help remove oxides and/or nitride in the weld? Aluminum, silicon, and titanium Serving as a blanket ️Slag can also slow down the weld cooling rate by ___________ Which improves it's physical properties. True ️The words "potential" and "voltage" have the same meaning and are used interchangeably. Water cooled and air cooled ️FCAW guns can be cooled using which two methods? Water cooled ️These guns are more efficient than air cooled guns at removing waste heat. Air cooled gun ️This type of gun is more portable because it has less hoses and is lighter than a water cooled gun. Recirculating system ️The best way to cool down a water cool gun is by using a ___________ that is built onto the machine. 30° ️FCAW may be used in grooves as narrow as: Reduces filler metal, reduces metal prep time ️The two advantages of having a narrow and groove angle are: 25 pounds an hour ️FCAW welds can have deposition rates as high as: 90% ️What percentage of the weight of the FCAW electrode is metal? Nearly 100% ️In FCAW how much of the electrode purchased is actually used Controlled ️FCAW is more easily _______ than with GMAW. Seamless electrodes ️___________ are less likely to absorb moisture than the seamed electrode. Spools, reels, and coils ️FCAW electrodes are available in: cast ️_________ Forces the wire to make better electrical contact with the contact tube. The cast ️The diameter of the circle of the wire when it is laid out on the floor.