AC vs DC for demagnetising
AC vs DC for demagnetising
(OP)
During welding of cs pipelines (API 5L X 52-65 grades) especially the residual magnetism is the pipes (due to say induction heating during the coating) could cause problems during welding. Now traditionally, the equipment for demagnetising are AC equipment. I was told however that the welding rectifiers can be used for demagnetising, does anyone have experience on the same? If yes, please sepecify benefits and disadvantages in using DC over AC for demagnetising.
Thanks and regards
Sayee Prasad R CEng MWeldI MIOMMM
If it moves, train it...if it doesn't move, calibrate it...if it isn't written down, it never happened!





RE: AC vs DC for demagnetising
There are devices on the market that can de-magnetize pipe lines with up to 1000 gauss. They consist of a separate power supply and leads that use AC. We have not used these devices.
RE: AC vs DC for demagnetising
http://www.welding-advisers.com/
RE: AC vs DC for demagnetising
RE: AC vs DC for demagnetising
Thanks and regards
Sayee Prasad R CEng MWeldI MIOMMM
If it moves, train it...if it doesn't move, calibrate it...if it isn't written down, it never happened!