Folate depletion induced by methotrexate affects methionine synthase activity and its susceptibility

Plasma-MIG welding involving the use of two parallel consumable electrodes axially introduced into a plasma arc initiated by a non-consumable electrode and out through a nozzle. All three electrodes are maintained at a positive polarity whereby a substantial increase of the deposition rate is achieved, without rotation of the MIG-arcs and without exceeding the critical current intensity.