| 摘要 |
FIELD: technological processes. ^ SUBSTANCE: invention may be used for wear resistant welding onto articles of titanium and titanium alloys. In protective chamber 1, arc is excited between non-consumable tungsten electrode 4 and coated surface of item 3, and welding electrode 6 is supplied into zone of arc. According to the first version, it is made of pressed charge of exothermic mixture of powders of titanium, boron and/or carbon with ratio of titanium mass to mass of boron and/or carbon equal to 5-20, and alloying additives. According to the second version, welding electrode comprises rod of titanium or titanium alloy with charge applied on its surface in the form of layer of specified components in presence of binder. Reaction of exothermic mixture combustion is initiated. Welding layer 7 is applied by displacement of arc relative to surface of article with speed of exothermic mixture burning propagation that corresponds to speed of welding electrode feed into zone of arc. Front of burning reaction in process of welding is maintained at the distance from arc equal to 2-20 mm. ^ EFFECT: invention makes it possible to increase wear resistance and strength of working surfaces of articles, to increase resistance of welding to impact loads, to improve welding and technological properties and to increase extent of weldability of welded layer with processed surface. ^ 3 cl, 1 tbl, 1 dwg |
