admin Posted February 27, 2019 Report Share Posted February 27, 2019 What are the advantages and disadvantages of d.c. and a.c. welding? Why is it necessary to use a coated rod in the a.c. welding operation ? Give schematic representation of shielding metal arc. You can write the answer and upload relevant images to justify the answer (if required) Let's together discuss and contribute in making the best answer Link to comment Share on other sites More sharing options...
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