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1
Content available Ultrasonic Inspection Techniques Possibilities for Centrifugal Cast Copper Alloy
Konar R., Mician M.
Archives of Foundry Engineering
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2017
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Vol. 17, iss. 2
35--38
EN
The article deals with ultrasonic testing possibilities of the copper alloy centrifugal casts. It focused on the problems that arise when testing of castings is made of non-ferrous materials. Most common types of casting defects is dedicated in theoretical introduction of article. Ultrasonic testing technique by conventional ultrasound system is described in the theoretical part too. Practical ultrasonic testing of centrifugal copper alloy cast - brass is in experimental part. The experimental sample was part of centrifugally cast brass ring with dimensions of Ø1200x34 mm. The influence of microstructure on ultrasonic attenuation and limitations in testing due to attenuation is describes in experimental part. Conventional direct single element contact ultrasound probe with frequencies of 5 MHz, 3.5 MHz and 2 MHz were used for all experimental measurements. The results of experimental part of article are recommendations for selecting equipment and accessories for casting testing made of non-ferrous metals.
2
Content available Repairs of Damaged Castings Made of Graphitic Cast Iron by Means of Brazing
Mician M., Konar R.
Archives of Foundry Engineering
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2017
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Vol. 17, iss. 3
91--96
EN
The article summarizes the theoretical knowledge from the field of brazing of graphitic cast iron, especially by means of conventional flame brazing using a filler metal based on CuZn (CuZn40SnSi – brass alloy). The experimental part of the thesis presents the results of performance assessment of brazed joints on other than CuZn basis using silicone (CuSi3Mn1) or aluminium bronze (CuAl10Fe). TIG electrical arc was used as a source of heat to melt these filler materials. The results show satisfactory brazed joints with a CuAl10Fe filler metal, while pre-heating is not necessary, which favours this method greatly while repairing sizeable castings. The technological procedure recommends the use of AC current with an increased frequency and a modified balance between positive and negative electric arc polarity to focus the heat on a filler metal without melting the base material. The suitability of the joint is evaluated on the basis of visual inspection, mechanic and metallographic testing.
3
Content available remote Numerical simulation of temperature fields in Sysweld simulation programme
Konar R., Mician M., Strasko J.
International Journal of Applied Mechanics and Engineering
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2010
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Vol. 15, no 2
423-431
EN
The theoretical part of the paper deals with basic information about FEM simulation, simulation of temperature fields and temperature cycles in welding. A simulation programme Sysweld was used for welding simulation. The experimental part includes a simple simulation of temperature fields and cycles in five-pass butt welding joint. Results of the simulation are illustrated by means of temperature fields and temperature cycles.
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