The purpose of the work was to determine the possibility of rebuilding of the screw coils upper surface of a screw conveyors welded previously with chromium cast iron. The variant of surfacing ...directly on the residues of the hard layer and with the buffer layer was considered. The technology of hardfacing the coils after removal of the hardening upper layer and the technology of welding of new elements with the use of EnDOtec DO*390 powder wire has been developed to provide a NanoAlloy structure with boron nanocarbons in the iron matrix.
In this article results of abrasive wear resistance of a few different steel wear plates made by domestic and foreign producers in technology of automatic FCAW and manual arc (MMAW) cladding and ...metallurgical bonding of wear resistant layer with base material were presented. Based on abrasive wear resistance tests according to ASTM G65-00, in regard to reference samples from Hardox 400 steel and hardness measurements according to PN-EN ISO 6508- 1:2016 standard, products with best performance parameters on metal-mineral abrasion conditions were chosen.
Results of investigations into the properties of layers sprayed with the Fe-Cr-Ti-Si-Mn alloy and Fe-based nanoalloy containing a high percentage of fine precipitates in the form of boron carbide on ...plates of ASTM A516 unalloyed steel, Grade 55, designed for operation at elevated temperature are presented. For arc spraying, welding equipment of the newest generation, namely EuTronic Arc Spray 4, providing high stability of the process run, and EuTronic Arc 502 and EnDOtec DO*390N metal cored wires, 1.6 mm in dia, were used. Ten-millimetre-thick layers characterized by high abrasive and erosion wear resistance were sprayed.
W artykule opisano wymagania stawiane współczesnym stanowiskom spawalniczym przeznaczonym do napawania oraz zaprezentowano nowoczesne źródła energii i osprzęt do napawania plazmowego proszkowego. ...Podano podstawowe zalecenia techniczne i technologiczne zapewniające wykonanie wysokiej jakości napoin oraz przedstawiono różne przykłady przemysłowego napawania plazmowego proszkowego. industrial applications of powder plasma transfered arc welding Abstract The article presents the requirements for modern hard-facing stations, modern energy sources and equipment for powder plasma transfered arc welding (PPTAW). The basic technical and technological recommendations for high-quality weld metal are provided, and also it presents various industrial applications of PTA powder hard-facing.
This study aimed to examine whether the physical and technical activities of soccer players and match locations can be associated with higher or lower odds of winning matches whose outcome can be ...described as “close.” The study comprised 7972 individual observations of German Bundesliga players during the 2014/2015 (
n
= 2794), 2015/2016 (
n
= 2494), and 2016/2017 (
n
= 2684) seasons. A selection of “close matches” was made, which were defined as those in which the difference in numbers of scored goals was ≤1. Players’ five pitch positions were considered: central defenders, fullbacks, central midfielders, wide midfielders, and forwards. Data on 12 physical and 10 technical activities performed by players during matches as well as on match location were retrieved from the Impire AG (Germany) match analysis system. The study results show that the odds of winning at home are different for each playing position: from 41.99% for wide midfielders to 91.34% for central midfielders. Another conclusion was that one of the key components of the predictive model for forwards is the percentage of overall distance covered at speeds >24 km/h (7.99%), which is a variable with an increasing trend. The proposed model predicts that each 1% increase in this variable will theoretically be associated with a 4.08% raise of the odds of winning in further seasons. The presented statistical model may be used by trainers to identify players’ physical and technical activities and contextual variables that may significantly affect the match outcome. In addition, it can help to determine the individual training load related to the player’s position on the pitch.
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