... is 20-GB9948. 3.Process: a) After welding kettle door, it must proceed annealing heat treatment. b) Polish toothed ... ), ensure its strength. e) Welds are 100% X- ray detection, then carry out hydraulic test of 2.1MPa after passing ... the door. c).Equip with electric limited safety interlocking device,use cooperatively with manual limit, and connect with electric cabinet, rotating electrical ark with ...