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Low-Energy Welding Methods Used for Semi-Automatic Thin-Walled Automotive Steels

100%

Korzeniowski M. , Piwowarczyk T. , Kustroń P. , Czubak A.

Advances in Materials Science

2013

tom Vol. 13, nr 3(37)

36--48

The paper deals with the issues of welding modern car-body steels (including dual phase (DP), high strength low alloy (HSLA) and deep-drawing (DC) grades) using low-energy methods. In view of small thickness of elements to be joined, welding them with conventional arc methods has becoming more and more rare and has been replaced with methods which, while ensuring required strength properties of joints, deliver substantially less heat to the weld, thus limiting its effect on the structure being welded. Examinations (visual inspections, strength tests, hardness measurements) allowed an objective evaluation of selected low-energy methods with respect to MAG welding with CO2 shielding.

Effect of Welding Current on Tensile-Peel Loading of Welding Joints in TRIP 800 and Micro-Alloyed Steels in Resistance Spot Welding

100%

Onar V. , Aslanlar S. , Akkaş N.

Acta Physica Polonica A

2017

tom 132

nr 3

822-824

In this paper, an analysis of electric resistance spot welding between micro-alloyed steel sheets having 1 mm thickness and TRIP 800 (transformation induced plasticity) steel sheets having 1.5 mm thickness was made. Couples of steel sheets are used in automobile industry. Steel pairs were joined by using resistance spot welding as overlap joint. A timer and current controlled resistance spot welding machine had pneumatic application mechanism and 120 kVA capacity. Preparation of specimens by spot welding was performed using different cycles ranging from 5 to 30 cycle and welding currents ranging from 8.5 to 16.5 kA by rise of 0.5 kA. The electrode force was kept constant at 6 kN. The prepared welding specimens were exposed to tensile-peel tests and the obtained results were supported by diagrams. Finally, appropriate welding parameters were advised to the users.

Numerical simulation of crashbox deformation

63%

Ambroziński M. , Pernach M.

2013

tom R. 86, nr 10

894, 896--898

Zadaniem elementów konstrukcyjnych znajdujących się w strefie kontrolowanego zgniotu jest absorpcja jak największej ilości energii uderzenia. Przedstawiono wyniki symulacji numerycznej procesu odkształcania elementów crashbox wykonanych ze stali DP oraz TRIP. Na ich podstawie określono własności funkcjonalne elementu. Opracowany model pozwala usprawnić proces projektowania crashboxa, a także wyeliminować konieczność przeprowadzania kosztownych testów zderzeniowych.

Structural elements of the car body in the controlled crash zone are expected to absorb as much impact energy as possible. Presented are the results of numerical simulation of deformation of the crash box components made from DP and TRIP steel grades. Basing on these data product serviceability was estimated. These results might serve as a reference model in the crashbox design work and a good reason for exclusion of costly experiments.