METHOD OF PRODUCING ICE CAST-IRON CYLINDER HEAD VALVE SEAT OR RECONDITIONING THEM BY ARC DEPOSITION

摘要

FIELD: process engineering. ^ SUBSTANCE: invention may be used in reconditioning or producing internal combustion engine valves. Machining is carried out after valve surface cleaning and flaw detection. Seat is made by arc deposition on valve seat surface. Nickel sublayer is built up by short arc of forward polarity current in atmosphere of welding gas with forging the built-up bead at the rate not allowing metal chilling. Surface with nickel deposition is subjected to machining. Working layer of austenitic heat-resistant steel is deposited by consumable electrode with reverse polarity current and forging of every bead at the rate not allowing metal chilling. Seat working surface is subjected to finishing. ^ EFFECT: higher thermal fatigue strength, durability and wear resistance. ^ 4 dwg