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Increasingly high requirements concerning welded structures made of aluminium alloys trigger the issue of fatigue strength. Previous tests have indicated that the fatigue strength of FSW joints is higher than that of, e.g. MIG-welded joints. However, it should be noted that the use of the FSW technology may sometimes be limited or impossible. One of the methods enabling an increase in the fatigue...
The article presents attempts related to the laser welding of combustion engine manifold and turbine. The study discussed in the article made it possible to identify the potential and limitations connected with the application of laser welding technologies, workmanship accuracy and the positioning of elements to be welded. The study-related tests enabled the assessment of the effect of primary welding...
The study presents the geometry as well as results of the peeling, shearing and metallographic tests of copper and aluminium welded joints used in the absorber panels of flat solar collectors. The article discusses desired characteristics and mechanical properties of ultrasonic welded joints and compares the latter with laser welded joints. In addition, the study indicates prospective implementation...
The article justifies the application of explicitly defined static current and voltage characteristics in mathematical models of dynamic electric arc. The study involved the use of the generalised function approximating the above-named characteristics to create the differential and integral forms of the Novikov-Schellhase, Pentegov and Mayr-Pentegov mathematical models. Macromodels of arc were developed...
The development of the application of the residual magnetic field (RMF) (measured on the surface of the ferromagnetic object) as a diagnostic signal involved the analysis of the effect of initial remanence on changes of the RMF during tension. Test plate specimens made of steel P91 (X10CrMoVNb9-1) in various as-delivered states were subjected to increasing active tensile stress. The test results revealed...
Presently used magnetic methods for testing wire ropes leave an untested rope section located in the direct vicinity of a tapered socket. However, the aforesaid area may contain damage resulting from existing stresses and wear processes. The article discusses results of a study concerned with diagnostic equipment enabling the assessment of the above-named area in terms of its technical condition as...
The paper presents methods for determining the fatigue life of welded joints with particular emphasis given to typical joints. In addition, the article presents various possible nominal stress-based ways enabling the calculation of stresses, including structural stresses and involving the most complex linear fracture mechanics. The paper also discusses recommendations by the International Institute...
The article presents the history of the mechanisation and automation of arc welding at the turn of the 20th century, including Benardos’ and Slavyanov’s first welding machines and the first related patents.
The paper presents problems experienced during repairs of structures operated at high temperature for a long time. Research-related TOFD method-based ultrasonic tests revealed indications implying the presence of unacceptable imperfections in welded joints. Attempted repairs involving the use of welding methods proved ineffective as the welding and heat treatment processes resulted in the formation...
The article presents results of tests concerning the effect of heat treatment on the structure and hardness of submerged arc welded joints made in steel 7CrMoVTiB10-10 (T24). The tests revealed that the welds made of steel 7CrMoVTiB10-10 required post-weld heat treatment at a temperature 750°C. The heat treatment was performed in order to protect welded structures from cracking during transport and...
The article discusses the effect of annealing temperature applied during heat treatment as well as the suitability of preheating before the welding of butt joints in pipes (having a diameter of 33.7 mm and a wall thickness of 4.5 mm) made of steel X10CrMoVNb9-1 (P91). In the article, the structure and properties of a joint subjected to heat treatment performed in accordance with manufacturing standards...
The paper presents test results concerning the service life of fillet welds made in steel S355. In addition, the article discusses the initiation and growth of fatigue cracks in specimens subjected to bending with torsion. The tests were performed in relation to constant stress ratio R = -1 and 0. The results presented in the article take into account the effect of the technological treatment on the...
The article describes an innovative robotic MAG method for the welding for ship elements. The method involves the use of two wire feeders and one torch, making it possible to weld two different steel grades. In addition, the robot application is equipped with an off-line programming DTPS system (Desk Top Programming & Simulation System) as well as an arc sensor, a gas nozzle touch sensor and a...
The basics of diving and working under water have been highlighted and explained as such, while these circumstances have also great influence on the welding behavior of the consumables applied. The challenge is in the execution of the welds and repairs. The paper covers the diving, welding and metallurgical aspects of underwater „wet” welding & cutting using covered electrodes based on industrial...
The article presents applications of high-strength quenched steels in various industrial sectors and the chronological development of various grades of the aforesaid steels. The research-related tests involved flat butt joints made in 7 mm thick steel grade S1300QL, welded using the following methods: TIG, A-TIG, MAG involving the use of a hard flux-cored surfacing wire, MAG method involving the use...
The article describes tests of steel subjected to cutting with laser, plasma and abrasive waterjet. The research discussed in the article also involved microstructure observation and changes in hardness after cutting are as well as the assessment of surface quality based on measurements of surface parameters.
The article discusses the basic properties of the Mayr-Pentegov mathematical model of electric arc. The study involved the selection of a set of generalised functions enabling the approximation of static voltage-current characteristics. The functions were used to determine the derivatives of the conductance function in relation to the squared current (used to calculate the non-linear damping function)...
The article presents results of test concerning reasons for the failure of a steel pipeline (DN 80) used for the injection of formation waters. The tests revealed that the perforation and subsequent material losses in the wall of the DN 80 pipeline made of steel L360NB were caused by deposit corrosion.
The article presents attempts related to the laser welding of combustion engine manifold and turbine. The study discussed in the article made it possible to identify the potential and limitations connected with the application of laser welding technologies, workmanship accuracy and the positioning of elements to be welded. The study-related tests enabled the assessment of the effect of primary welding...
New method of calculating the amount of heat introduced into the welded joint is presented. Instead of the previously used measure of heat input per unit length, heat input per unit volume was proposed. The proposed method and general formula are based on the basic technological parameters of the welding process (i.e. energy generated by the electric arc and welding speed) and the cross-sectional...
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