Abstract
This paper presents results of the research focused on the possibility of the restoration of the shape parts of molds made of X15CrNiSi20-12 (EN 100 95) heat-resistant austenitic chromium-nickel stainless steel working in high-pressure die casting of aluminum alloys by clad welding. There were tested two welding wires—E Ni 6625 and E 18 8 Mn B 2 2—deposited on X15CrNiSi20-12 (EN 100 95) tool steel using cold metal transfer (CMT) welding in a protective atmosphere of Ar. The resistance of welds was tested against dissolution in molten aluminum alloy ENAC-AlSi9 and the testing procedure was designed. The resistance of welds against dissolution were assessed by exposition of welded clads in an aluminum melt for 120 and 300 min. The EDX semi-quantitative microanalyses of element distribution were performed at the welding–melt interface, and build-ups were also observed on the surface of welded clads.
Highlights
High-pressure die casting technology (HPDC) is a balanced system of interrelations between the properties of the aluminum alloy melt, the design of the mold—including the inlet and venting, as well as the conditions of mold cavity filling, in particular the melt velocity in the mold—and the hydrodynamic pressure [1]
The resistance of E Ni 6625 welded clad against dissolution after immersion time 300 min in ENAC-AlSi9 alloy was analysed in the same way
At the boundary of the solidified melt of the aluminum alloy and the E Ni 6625 weld deposit, the concentration of Ni and Fe in the compact layer was increased to the rest of°C/120 the layer
Summary
High-pressure die casting technology (HPDC) is a balanced system of interrelations between the properties of the aluminum alloy melt, the design of the mold—including the inlet and venting, as well as the conditions of mold cavity filling, in particular the melt velocity in the mold—and the hydrodynamic pressure [1]. Depending shape and hardness between particles injection molding cycles in act the as area of the fitting surfaces betweenon thethe mold parts During this of these particles, one of the following mechanisms of abrasive damage can occur: ploughing, cutting process, solidified particles of cast metal can act as abrasive particles. The latest published research on mold restoration by welding [5,6,15,16,17,18] aims to identify ways and possibilities to increase mold surface lifetime using CMT welding and to verify the suitability of the chemical composition of newly developed additive materials for mold restoration Such layers will withstand the presented combinations of tribodegradation factors while being resistant to the action of the injected liquid. Evaluation of welded clads used for the renovation of shaped parts of molds for the HPDC processes
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