FIELD: welding processes and equipment, namely, welding of refractory and heat-resistant materials in different branches of machine engineering. SUBSTANCE: cathode is placed inside near-cathode electrode. Magnetic lens is placed between accelerating anode and article and it is in the form of current-conductive flare provided with lengthwise slit having wide portion near accelerating anode and narrow portion near article. EFFECT: improved design, lowered energy consumption, reduced size of apparatus at simultaneously enhanced electron-beam focusing. 2 dwg
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