Abstract
The object of research is the repair of press molds with the help of plasma-MIG surfacing. The weld metal on the repaired press molds wears out unevenly, has a different structure and hardness, which is characteristic of multi-layer surfacing of alloyed steels. The greatest way to manage the storage and quality of surfacing is a combined method – plasma-MIG surfacing. An analysis is made of all plasma-MIG surfacing options for surfacing in order to strengthen the surfaces in the repair and manufacture of products operating under thermal cyclic loads. It is established that when restoring press molds working under thermocyclic loads, to ensure uniform hardness over the cross-section of the welded metal layer, the surfacing should be carried out with a minimum step in the optimum operating regime: a Н =16-19 g/A . h. y B . S =4–5 %; K V =91 %. It has been experimentally proved that in order to reduce the width of the eutectic sections that is distinguished along the grain boundaries, and hence also the decrease in the probability of crack formation in the deposited layer, the plasma-MIG surfacing on the developed unit should be carried out at the lowest possible current I=75–90 A. This will significantly increase the crystallization rate of the deposited metal.
Highlights
One of the most important tasks of industrial production in Ukraine is to improve the quality of products, reduce labor, energy and materials
The possibility of using different methods of surfacing for the purpose of repairing and obtaining surfaces of tools and parts operating under extreme conditions has a great importance [1]. Such products include press molds for the production of glass insulators, as well as equipment for hot working with non-ferrous metals [2]
The object of research is the repair of press molds with the help of plasma-MIG surfacing
Summary
One of the most important tasks of industrial production in Ukraine is to improve the quality of products, reduce labor, energy and materials. The possibility of using different methods of surfacing for the purpose of repairing and obtaining surfaces of tools and parts operating under extreme conditions has a great importance [1]. Such products include press molds for the production of glass insulators, as well as equipment for hot working with non-ferrous metals [2]. The working surface of the press mold is exposed to high temperatures and their sudden drop, and to the chemical attack of the corrosive medium. With the help of the conducted researches it is possible to reduce the probability of cracks formation in the deposited layer by means of plasmaMIG surfacing
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