FIELD: welding of refractory and heat-resistant materials in different branches of machine engineering. SUBSTANCE: cathode is placed inside near-cathode electrode. Focusing lens is in the form of pairs of plate-type members arranged with possibility of creating electric fields of those pairs in crossing directions for forming common electric field providing electric barrier for electrons. Plate-type members are bent in cross section along circumferential generatrices of concentric hollow cylinders. EFFECT: enhanced focusing of electron beam, reduced energy consumption, lowered size and material consumption of apparatus. 3 dwg
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