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PTA-GMA hybrid welding of UHSS steel in structures of large-scale

Nowacki J., Krajewski S., Matkowski P.

Archives of Materials Science and Engineering

2015

Vol. 71, nr 2

53--62

Purpose: An analysis of application possibilities for PTA-GMA hybrid welding in large-sized high- strength steel structures that require using particularly effective and high-performance technologies as related to quality and costs. Design/methodology/approach: Welded joints were made of S960QL steel by employing plasma and GMA hybrid welding by using various welding parameters. The tests were designed so that interrelations between particular welding technologies can be demonstrated. Macroscopic and microscopic examinations as well as hardness and tensile strength tests for welded joints were carried out. Findings: It has been shown that traditional welding methods SAW and GTA can be replaced by PTA-GMA hybrid welding. The obtained welded joints show different geometric features and hardness depending on welding technology used. Research limitations/implications: The description of welded joint structure and mechanical properties was based on welding toughened steels by using an innovative welding method and a filler that has been proposed. Practical implications: The parameters of plasma and GMA hybrid welding for industrial uses were established at the company Teleskop Sp. z o.o. The selected best welding technologies will be subject to welding procedure approval according to PN-EN 15614-1 and implemented into mass production. The information gained from toughened steel welding is an important basis for future research on metallurgical walkability by using high-performance methods of hybrid welding of large-sized structures. Originality/value: The problems associated with welding S960Q steels by using various welding technologies, including the use of an innovative GMA plasma hybrid welding method that is still at the initial stage of research work and there are no original references regarding the suitability of the a/m welding method for large-sized structures made of high-strength toughened steels were established. It has been shown that PTA-GMA hybrid welding has a significant effect on base metal structural changes resulting from a unique nature of combined heat sources of plasma and electric arc.

Testing procedures in evaluation of resistance of innovative shear connection with composite dowels

Lorenc W., Kubica E., Kożuch M.

Archives of Civil and Mechanical Engineering

2010

Vol. 10, no 3

51-63

The article constitutes an introduction to the issue associated with modern steel-concrete composite girders having open continuous connectors of the composite dowels type. The way of fabrication of the steel portion of the composite girders has been presented as well as the details connected with experimental investigations on the new type of composition which demands broader approach of researches than attempts of determining the load-bearing capacity used so far, known as POST. The steel connector constitutes an integral part of the steel part of composite beam, in which it is subjected apart from the local longitudinal shear acting between steel and concrete, to the global effects of bending and axial loading as well. Thus, the stress criteria describing the composite dowel’s behaviour have to be established and it is much more than pure load-bearing capacity criteria used in present. The test procedures combining the concept of the load-bearing capacity for the concrete part of the connector and the elasticity of its steel part lead to an efficient designing of the composite structures.

Niniejsze opracowanie dotyczy metod badawczych pozwalających określić nośność zespolenia typu composite dowels. Omówiono szczegółowo problematykę badań nowego rodzaju zespolenia, które wymaga szerszego podejścia badawczego niż stosowane dotychczas próby nośności granicznej typu POST. Łącznik stalowy, pracujący jako integralna część stalowej belki zespolonej, partycypuje w przenoszeniu obciążeń nie tylko od lokalnego ścinania podłużnego między stalą i betonem, ale również podlega wytężeniu od globalnych efektów zginania i działania sił osiowych. Wymusza to opracowanie kryteriów naprężeniowych opisujących pracę łącznika, stąd też problematyka badawcza łączników wykracza poza stosowane do tej pory wyłącznie kryteria nośności granicznej. W tekście referatu przedstawiono procedury badawcze, które w połączeniu z koncepcjami nośności granicznej w odniesieniu do części betonowej łącznika, oraz sprężystej w odniesieniu do łącznika stalowego, prowadzą do sprawnego wymiarowania zespolenia w rzeczywistych konstrukcjach.