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The paper presents results of impact energy effects on real welded specimens of fine-grained high-strength S960QL steel, and elaborates the dependence of real welded specimen hardness on heat input. Results are obtained through measuring of hardness HV 10 and by experimental Charpy V-notch test. V-notch on test tubes was moved for 0,5 mm from the fusion line in the heat affected zone. [ABSTRACT FROM AUTHOR]

The research objective was to test the parameters of real welding of the high-strength micro-alloyed S1100QL steel against the hardness and impact energy. The samples were welded at different welding parameters. Results of measuring the HV10 hardness and of experimental Charpy V-notch test performed at different temperatures are presented in tables and diagrams. This paper presents also the welding parameters, which provides a high quality welded joint without cold cracks. [ABSTRACT FROM AUTHOR]

This paper elaborates results of hardness and impact energy of thermal cycle simulated specimens of high-alloy steel P 91 and their dependence on cooling time from 800 to 500 °C. Results were obtained by measuring hardness HV 1 and by experimental testing of Charpy notched specimens. Metallographic analysis of samples was performed on scanning electronic microscope. [ABSTRACT FROM AUTHOR]

The paper deals with research into dependence of hardness and impact energy of thermal cycle simulated specimens of fine-grained structural steel S960QL on cooling time from 800 to 500 °C and on tested temperature. Results were obtained by measuring hardness of HV 10 and by experimental testing of Charpy notched tubes on instrumented Charpy hammer. Total impact energy, initiation energy and fracture propagation energy needed for occurrence of fracture is also elaborated. [ABSTRACT FROM AUTHOR]

The paper presents research of weldability of microalloyed high strength steels TStE 420 and S960QL after weld thermal cycle simulation. Beside mechanical properties hardness and impact strength, the microstructures of characteristic weld thermal cycled structures for both steels are given. The results will contribure to determination of weakest points in Heat Af ected Zone of both steels. [ABSTRACT FROM AUTHOR]

In the process of testing real components exposed to elevated temperature, it is not possible to neglect cracks. The most significant cracks can be induced by welding, which is applied for joining of structural components. Pressure equipment in service is also exposed to high pressure and high stresses. Materials for their manufacturing are designed to resist high stress at elevated temperature, and to meet requirements regarding creep resistance. The objective of this study is to investigate microstructure of different regions of the heat affected zone in T/P91 steels by using thermal simulation instead of welding. [ABSTRACT FROM AUTHOR]

This paper presents most important techniques which is possible to apply at joining of railway lines as well as maintenance procedure. Beside thermit welding as a older joint process for that job (since 1895.) it is mentioned flash welding as a modern joining technique interesting from the point of cost efficiency. In a case of maintance tasks it is necessary to caunt arc welding processes and thermit welding, too. Authors gave some experimental date collected during investigation on railway lines joining techniques application. [ABSTRACT FROM AUTHOR]

In order to ensure performance reliability of a welded product, its quality has to be ensured by proper setting of welding parameters and welding cycle. A quality weld - a weld with no manufacturing, structural or geometric flaws, i.e. with necessary mechanical properties - is achieved only by correct parameter definition and adherence. The knowledge of various effects and relations between welding parameters and their repetition enable an optimal choice of welding parameters. [ABSTRACT FROM AUTHOR]

This paper presents impact energy results of specimens made from high strength fine grained steel TStE 420 after thermal cycle simulation. These results are obtained by examining Charpy specimens. Metallographic analysis is performed, hardness is measured and total impact energy is divided into ductile and brittle components. [ABSTRACT FROM AUTHOR]

This paper presents the results of Finite Element Method numerical simulation performed onEN-AW5754(AlMg3), EN AW-5019 (AlMg5) plates subjected to mechanical clinching. The goal was to observe differences between aluminum plates in the same tool; and to determine the possibility of using the constructed tool for the clinching of Al-Al material combinations. This tool construction is to be produced and tested in laboratory conditions, to elaborate prospective results, and reach additional conclusions. [ABSTRACT FROM AUTHOR]

This paper presents the results of weldability investigation on welded joints made of fine - grained high-strength S1100QL steel. The investigations are performed on two welded plates by HV 10 hardness measuring and by Charpy V notch testing at different test temperatures. Mechanical properties of welded joints are overviewed, along with welded parameters, all of which enable obtaining of high-quality welded joints. [ABSTRACT FROM AUTHOR]

The specimens of damaged tubes, ASTM A297 HK40, are repaired by welding. Before repairing, solution annealing is used as a procedure for properties restitution.This paper explores the influence of used solution annealing procedure (1 050 °C / 2h) on mechanical and micro-structural properties. The emphasis is put on specific procedures at repair by welding. [ABSTRACT FROM AUTHOR]

This paper presents accelerated weldability investigation after weld thermal cycle simulation of TStE 420 steel. The method enables single cycle or multiple cycle thermal simulation of base material specimens and obtaining any point in the heat-affected zone (HAZ) of a welded joint. After weld thermal simulation, an investigation of mechanical properties on treated specimens (hardness, toughness..) is foreseen, based on which it is possible to determine weak points in HAZ of a welded joint and inference regarding to base metal weldability. [ABSTRACT FROM AUTHOR]

The specimens plated by different cladding procedures (hot rolling, submerged arc welding surfacing using strip electrode (SAW) and explosion welding) were heat treated by annealing (650 °C through 2 hours). Charpy impact energy testing, as well as shear strength testing of clad joints were performed. Testing results indicated significance of cladding procedure and determined heat treatment influences on stated mechanical properties. [ABSTRACT FROM AUTHOR]

Shielded metal arc (SMAW) welded specimens using austenitic consumable materials with different amount of delta-ferrite are annealed in range 650-750 °C through 2-10 hours. Factorial plan 3³ with influenced factors regression analyse of measured delta-ferrite values is used. The transformation i.e. decomposition of delta ferrite during annealing was analysed regarding on weld cracking resistance using metallographic examination and WRC-1992 diagram. [ABSTRACT FROM AUTHOR]