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Your search for defects resulted in 14 matches...

CONVERSION COATINGS ON MAGNESIUM ALLOY DIE CASTINGS PART 1: THE EFFECT OF TECHNOLOGICAL PARAMETERS OF THE PRESSURE DIE CASTING PPROCESS ON THE QUALITY OF CASTINGS MADE FROM THE AZ91 ALLOY


The article presents the results of research on the selection of optimum technological parameters of the hot-chamber die casting machine operation to make castings in AM50 magnesium alloy, coated next with the deco...

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ANALYSIS OF THE POURING AND SOLIDIFICATION PROCESS OF ALLOYED STEEL CASTINGS FOR LOW - TEMPERATURE PERFORMANCE


The study forms a part of the program of applied industrial research executed under Target Project No. ROW-II-403/2008 at MAGNUS-NORD Sp z o.o in Toruń. Pouring and solidification of two large steel castings weigh...

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STRESS MODELS AND THEIR APPLICATION IN EXPLANATION OF CASTING DEFECT INFLUENCE ON THE CAST PART MECHANICAL BEHAVIOUR


The article examines possible use of analytical and numerical models of casting defects of a void type in determination of local increase of stresses in the vicinity of casting defect. The stress level can be one o...

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HIGH-TEMPERATURE SULPHIDATION OF Fe-Cr-Al STEELS: THE PRESENT STATE OF THE ART AND FUTURE RESEARCH


This work reviews the current state of research regarding high temperature sulphidation resistance of Fe-Cr-Al steels that belong to a family of AFA (Alumina Forming Alloys). The behavior of these steels in hot gas...

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TECHNOLOGICAL ASPECTS OF ALLOYS BASED ON THE Fe-Al SYSTEM


Melting of cast steel based on Fe-Al system was described. Problems of technological nature related with the melting process performance, starting with computer simulation and in the casting treatment ending, were discussed. The outcome of the stu...

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NICKEL LAYER DEPOSITION ON INVESTMENT CASTING POLYMER PATTERNS


The article presents a method of modification of ceramic mould surface on the boundary between lost-wax model - ceramics by using a layer of nickel on a disposable model made of a specified type of polymer e.g. polymethyl methacrylate (PMMA) and t...

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THE STUDY OF FACTORS ALTERING PHYSICAL AND CHEMICAL STATE OF LIQUID CAST IRON AND A SELECTION OF THE MATERIAL PROPERTIES


The study was conducted to determine the effect of spheroidization and modification method, of the CE value, the content of magnesium and lanthanum on susceptibility to form shrinkage defects, structure and resistance properties of ductile cast ir...

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SIMULATION TESTS TO FORECAST SELECTED PROPERTIES OF THIN-WALLED CASTS OF DUCTILE IRON DOMES


Thin-walled dome casts (hemispheres) with a wall thickness of 4.2 and 10.3 mm made of ductile iron underwent simulation tests within the frame of forecasting the tendency to create residual stresses, casting defects, the shaping of structures and ...

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Analysis of the sulphur content in moulding sands with furan resins


Among various sands with organic binders, moulding sands with furan resins belong to the group most widely applied in the manufacture of castings from ferrous alloys. This is due to a number of undisputable advantages offered by these sands, altho...

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The use of X-ray computed tomography as a tool in assisting cast material testing


Casting manufacture depends on many factors. Technical specifications determine the required quality, which is essential for casting acceptance or rejection. Practice shows that making castings without defects is simply not possible. However, the ...

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Effect of oxidation and mechanical damage of PCBs with OSP finish on their solderability with SAC305 alloy


The paper focuses on the experimental investigation of wetting behavior and solderability of commercial lead-free solder on Printed Circuit Board (PCB) covered with an OSP finish (Organic Surface Protectant) characterized by physical (mechanically...

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CastExpert system for casting defect diagnostics


The investigations of the CastExpert system have been conducted at the Foundry Research Institute for many years now, including the following: perfecting the internal structure of the system and diagnostic procedures, enriching the knowledge base ...

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Processes of pyrolysis and their effect on cast quality and working conditions


The article discusses the thermal processes undergone by the sand mould in contact with the liquid casting alloy. Depending on the character of the atmosphere in the mould, this can be the process of combustion or pyrolysis (when there is no oxyge...

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Analysis of the drying process of moistened surface layers of sand moulds and cores on the example of moulding sand with water glass


An analysis of the drying process of surface layers of sand moulds and cores (made of loose self-hardening moulding sand with hydrated sodium silicate hardened with a liquid ester hardener) which was previously subjected to the process of moisture...

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