Multiple Choice Identify the choice that best completes the statement or answers the question 19 Which is the best material to use for special protective clothing Polyester C 100 wool 100 cotton d leather 20 The job of the Flux on the stick electrode is to a Form a slag layer over the weld b Change the characteristic of the arc C Provide a directional support for the molten metal a b 21 There are a few techniques to starting a weld which ones are correct a Tapping C Scratching b Igniting d High Frequency 22 It s important to keep which variables consistent during the welding process Voltage Travel Speed Stick out a b Arc Length a b d e 23 A Defect Discontinuity that consists of air pockets a Lack of Fusion b Excessive Reinforcement 25 Excessive Spatter is cause by too high of amperage too long of arc length a b Slag Inclusion Shield the weld pool All of the above C d 24 A Defect Discontinuity that consists of a non metal piece lodged inside the weld a Porosity c Incomplete Fusion b d a 5 mins b 8 mins C d Porosity C d in the weld sle Slag Inclusion 26 Welding Electrodes with the third digit of 1 ie 7018 means They can only be welded 1 way They are limited to Flat and horizontal C d Incomplete Joint Penetration C d Arc Blow All of the Above 27 If a machine had a duty cycle of 50 125 amps how many minutes could it run 125 amps in a 10 m amps hout mon in cycle Can only be welded flat Can be welded in all positions 6 mins 25 seconds 10 mins