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1
Content available Material ultrasonic attenuation influence on conventional ultrasonic non-destructive copper alloy cast testing
100%
Koňár R. , Mičian M.
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nr 1
2
Content available Repairs of Damaged Castings Made of Graphitic Cast Iron by Means of Brazing
100%
Mičian M. , Koňár R.
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nr 3
3
Content available Determination of Phase Transformation Temperatures by Dilatometric Test of S960MC Steel
85%
Málek M. , Mičian M. , Moravec J. , Málek M. , Mičian M. , Moravec J.
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2021
4
Content available Identification of Lack of Fusion and Incomplete Penetration in Butt Weld Joint by Ultrasonic Phased Array Method and X-Ray Method
80%
Koňár R. , Mičian M. , Boháčik M. , Gucwa M.
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nr 3
5
Content available Identification of Lack of Fusion and Incomplete Penetration in Butt Weld Joint by Ultrasonic Phased Array Method and X-Ray Method
80%
Koňár R. , Mičian M. , Boháčik M. , Gucwa M.
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tom Vol. 64, iss. 3
1117--1124
EN
The main goal of the article is to identify artificially created defects like lack of fusion and incomplete penetration in buttweld joint using non-destructive volumetric methods. These defects are the most serious defects in welds of steel constructionsfrom the safety point of view. For identification, an ultrasonic phased array technique and a conventional X-ray using digital imaging were used. The theoretical part of the article describes the current state of the given issue and provides basic theoretical knowledge about ultrasonic and X-ray welding tests. In the experimental part, the procedure and results of testing butt weld joint are described by both non-destructive methods. The butt weld joint was made from steel S420MC. Each indication obtained by the ultrasonic and x-ray technique is supplemented by the macrostructure of the weld taken from the indication position. The results of the experimental work mentioned in the article point to the possibility and reliability of the identification of melting defects by selected nondestructive methods in terms of their character and orientation.
6
Content available Evaluating the Attenuation in Ultrasonic Testing of Castings
80%
Boháčik M. , Mičian M. , Sládek A.
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nr 2
7
Content available Evaluating the Attenuation in Ultrasonic Testing of Castings
80%
Boháčik M. , Mičian M. , Sládek A.
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tom Vol. 18, iss. 2
151--156
EN
This paper considers the assessment of attenuation in aluminium alloys castings and in cast iron prepared by gravity casting method and by casting under pressure. The issue of ultrasound attenuation is important in setting the conditions of non-destructive (NDT) testing, especially in casted materials. The characteristics of the ultrasonic technique and ultrasonic attenuation and the calculation of the attenuation and the velocity of ultrasound are presented in the theoretical part of this paper. For experimental measurements, cylindrical castings from AlSi alloy (a hypoeutectic alloy with a silicon content of about 7% - AlSi7 and a eutectic alloy with a silicon content of about 12% - AlSi12) and from grey and ductile cast iron were made. The ultrasonic records of the casting control, the calculation of ultrasound attenuation for individual samples are listed and described in the experimental part. The evaluation of measurements and comparison of calculated ultrasound attenuation is at the end of this article.
8
Content available The Analysis of Filler Material Effect on Properties of Excavator Crawler Track Shoe after Welding Regeneration
71%
Gucwa M. , Winczek J. , Wieczorek P. , Mičian M. , Koňár R. , Gucwa M. , Winczek J. , Wieczorek P. , Mičian M. , Koňár R.
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9
Content available The Evaluation of the Wear Mechanism of High-Carbon Hardfacing Layers
71%
Winczek J. , Gucwa M. , Mičian M. , Koňár R. , Parzych S.
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nr 3
10
Content available The Repair of Foundry Defects in Steel Castings Using Welding Technology
71%
Winczek J. , Koňár R. , Mičian M. , Hlavatý I. , Gucwa M.
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nr 2
11
Content available The Evaluation of the Wear Mechanism of High-Carbon Hardfacing Layers
71%
Winczek J. , Gucwa M. , Mičian M. , Koňár R. , Parzych S.
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tom Vol. 64, iss. 3
1111--1115
EN
Materials based on cast irons are often used for protection against wear. One of the methods of creating protective surface with cast iron structures is hardfacing. The application of hardfacing with self shielded flux cored wire with high carbon content is one of the economical ways often used to protect machinery parts exposed to both abrasion and erosion. The wear resistance of hardfacings depends on their chemical composition, structure obtained after hardfacing, parameters of depositing process andspecific conditions of wear. As the base material in the investigation the steel grade S235JR was used. The wear behavior mechanism of hardfacings made with one type of self shielded flux cored wire and different process parameters were evaluated in thispaper. Structures obtained in deposition process were different in hardness, amount of carbides and resistance to wear with two investigated impingement angles. The erosion tests showed that impingement angle 30° gives lower erosion rate than angle 60°.
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Content available Physical Simulation of Individual Heat-Affected Zones in S960MC Steel
57%
Mičian M. , Winczek J. , Harmaniak D. , Koňár R. , Gucwa M. , Moravec J. , Mičian M. , Winczek J. , Harmaniak D. , Koňár R. , Gucwa M. , Moravec J.
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nr 1
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