ARC BLOW

 1. What defect you find in the given figure?

      

     

(a) Arc blow

(b) Over lap

         (c) Under cut

         (d) Distortion

        Ans.(a)

2. Which defect will occur, when the equipment is changed for AC to DC supply in arc welding?

         (a) Arc blow

         (b) Over lap

         (c) Weld crack

         (d) Distortion

         Ans. |(a)

3. What will be the effect of magnetic fields shown in the figure below?

        

        

          (a) Electrode gets over heated 

          (b) Electrode slice to base metal 

          (c) Exess melting of base metal 

          (d) Arc is deviated from its original path

             Ans. (d)

4. What is the purpose of warpping the weld cable around  the job in welding ?

          (a) To control arc blow 

          (b) To control arc speed 

          (c) To control arc length 

          (d) To control distorsion 

           Ans.(a)

5. Arc blow is a welding defect generally encountered in 

        (a) Arc welding using AC current

        (b) Arc welding using DC current

        (c) Gas welding 

        (d) Thermit welding

        Ans. (b)