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Shielded metal arc welding: Quiz

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Question 1: As the electrode melts, the flux covering disintegrates, giving off shielding gases that protect the weld area from ________ and other atmospheric gases.
OxygenNitrogenHeliumHydrogen

Question 2: SMAW is often used to weld ________, low and high alloy steel, stainless steel, cast iron, and ductile iron.
Carbon steelWrought ironAusteniteTool steel

Question 3: Typically, the equipment used for SMAW consists of a step-down transformer and for direct current models a ________, which converts alternating current into direct current.
Vacuum tubeHigh-voltage direct currentRectifierDiode

Question 4: Another little used variation of the process, known as firecracker welding, was developed around the same time by George Hafergut in ________.
AustriaCzech RepublicPolandHungary

Question 5: ________ and alternators are frequently used as portable welding power supplies, but because of lower efficiency and greater costs, they are less frequently used in industry.
Brush (electric)Electric motorElectrical generatorLinear motor

Question 6: An electric current, in the form of either ________ or direct current from a welding power supply, is used to form an electric arc between the electrode and the metals to be joined.
Electromagnetic radiationAlternating currentTransformerElectric power transmission

Question 7: This is especially true of alloy steels such as ________.
High-strength low-alloy steelStainless steelCast ironCarbon steel

Question 8: With ________ the polarity changes over 100 times per second, creating an even heat distribution and providing a balance between electrode melting rate and penetration.
Electric currentAlternating currentElectricityTransformer

Question 9: The process is used primarily to weld iron and steels (including stainless steel) but ________, nickel and copper alloys can also be welded with this method.
GoldTitaniumAluminiumSilver

Question 10: Strohmenger used ________ and lime coating to stabilize the arc, while Kjellberg dipped iron wire into mixtures of carbonates and silicates to coat the electrode.
SandSoilClaySoil liquefaction







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