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Repair of Structural Steel Surface Groove by Using Diffusion Welding of Pure Iron Powder

Rahimy Y., Vahdat S. E.

Archives of Foundry Engineering

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2016

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Vol. 16, iss. 2

105--110

EN

Metal pieces wear out due to variable loading, because cracks formed on their surface of them. In order to increase useful life of metal pieces with the help of different methods of welding, surface cracks are repaired. In this research, performance of the diffusion welding of pure iron powder through magnetic induction evaluated for repairing structural steel surface cracks. First, four specimens prepared including one control specimen and other three specimens grooved specimens in length of 6.25mm and in depth of 1mm and groove width in the sizes of 0.5, 0.75 and 1mm. Then by a coil, the induced current created in the piece surface. After crossing the current, the powder melted and the groove repaired due to diffusion welding. To prevent oxidation, the atmosphere inside the coil filled with argon gas. The results show that after repairing surface groove, tensile strength of the repaired specimens reached to the tensile strength of control specimen with the margin of 7.5%

2

Wpływ okresu użytkowania rozsiewaczy nawozowych na koszty ich eksploatacji

Kamionka J.

Problemy Inżynierii Rolniczej

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2014

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R. 22, nr 3

49--57

PL

W pracy przedstawiono wpływ okresu użytkowania rozsiewaczy na koszt ich eksploatacji na pod-stawie wyników badań 6 rozsiewaczy nawozów mineralnych. Różnica w kosztach eksploatacji rozsiewaczy zawieszanych użytkowanych przez okres 5 i 20 lat wynosi 0,25–0,66 zł·ha-1, a rozsiewaczy przyczepianych 1,20-1,28 zł·ha-1. Analizę kosztów badanych rozsiewaczy wykonano na podstawie metodyki stosowanej w IBMER [MUZALEWSKI 2009]. Długość okresu użytkowania rozsiewaczy nie ma znaczącego wpływu na koszty ich eksploatacji, największy wpływ na te koszty ma amortyzacja, a rozsiewacze nie należą do maszyn zbyt drogich. Dobór właściwego ciągnika do rozsiewacza ma większy wpływ na koszty eksploatacji agregatu niż roczne wykorzystanie rozsiewaczy. Użycie ciągnika o większej mocy (średnio o 11 kW) skutkuje wzrostem kosztów eksploatacji o ok. 5,30 zł·ha-1.

EN

The paper presents the influence of useful life of fertilizer distributors on cost of their exploitation. The discussed results are based on tests of six distributors. The difference in operating costs between 20 and 5 years of exploitation of mounted distributors ranges from 0.25 to 0.66 PLN·ha-1, but in case of trailed distributors the above difference is from 1.20 to 1.28 PLN·ha-1. The length of distributors useful life does not significantly impact the cost of their operation. The operating costs are mostly influenced by depreciation and the distributors are not too expensive machines. Selection of the proper tractor cooperating with distributor has a greater impact on the aggregate operating costs than the annual use of distributors. The use of a tractor with higher power (aver-age by 11 kW) results in an increase of operating costs by about 5.30 PLN·ha-1.

3

Statistical analysis of gaz-3110 vehicles noise

Pobedin A., Kosov O., Dolotov A., Domolazov F.

Journal of KONES

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2009

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Vol. 16, No. 1

407-410

EN

This work presents the results of the statistical analysis of noise in several points of GAZ-3110 vehicles. There are also the dependences between the loudness of noise and speed of an engine or useful life of a car. It is difficult to confuse the noise of jet engine with reciprocating internal-combustion engine. Random factors also influence much the power level. Mechanism adjustment has its limits and so it can have different influence on its vibration and noise. Finally during the process of operation sliding surfaces do wear, screwed connections do loosen, other things happen and these lead to the changes in spectrum and level of noise. In this work we tried to evaluate the dispersion of GAZ-3110 vehicles noise levels according to the results of a coustic measurements in the immediate field of rondom acoustically active constructive assemblies. The range of noise loudness for the specific car model is defined at the level 20-25 dBA. The GAZ-3110 vehicles are characterized by the significant dispersion of noise level. The differences of noise level of individual cars are exceeding 20-25 dBA. vehicles noise considerably increases with the augmentation of useful life and rpm speed. The noisiest element of GAZ-3110 vehicles is internal combustion engine, then main gear even when first gear is operated.