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Coefficient of restitution and plastic strain for impact of elements welded with micro-jet cooling

Hadryś D., Piwnik J., Węgrzyn T., Łazarz B.

Transport Problems

2014

T. 9, z. 2

61--68

The main purpose of investigations is the qualification how post-accident repair of model car body parts influence on the value of coefficient of restitution. Evaluation of impact energy absorption by model car body parts repaired with MIG welding (with and without micro-jet cooling) was carried out. The results of investigations present that the value of coefficient of restitution changes with speed of impact. Coefficient of restitution is bigger for elements welded with micro-jet cooling than for element welded with ordinary method. This could have influence on passive safety of vehicle.

Głównym celem badań jest określenie wpływu metody spawania (MIG chłodzeniem mikrojetowym i bez chłodzenia) naprawianych części nadwozia pojazdu na wartości współczynnika restytucji i ich odkształcenie plastyczne. Wyniki z badań przedstawiają wartość współczynnika restytucji w funkcji energii uderzenia. Współczynnik restytucji jest większy dla elementów spawanych z chłodzeniem mikrojetowym niż dla elementów spawanych zwykłą metodą. To może mieć wpływ na bezpieczeństwo bierne pojazdu.

Plastic properties of weld after micro-jet cooling

Piwnik J., Hadryś D., Skorulski G.

Journal of Achievements in Materials and Manufacturing Engineering

2013

Vol. 59, nr 1

20--25

Purpose: of that paper was analysing main plastic properties of welds made by MIG method with micro-jet cooling. The main reason of it was investigate possibilities of getting better plastic properties of welds made by MIG method with micro-jet cooling than welds made by ordinary welding method. It is possible because higher amount of acicular ferrite (AF) in WMD (weld metal deposit) is obtained in MIG method with micro-jet cooling in relation to ordinary welding method. Design/methodology/approach: During research Erichsen cupping tests and bending tests were carried out for welds made by MIG method with micro-jet cooling and ordinary welding method. Findings: High amount of acicular ferrite influences positively on plastic properties. Higher value of plastic parameters were observed for welds made by MIG method with micro-jet cooling. Research limitations/implications: That research was made for MIG method only. Another method of welding was not tested. Other methods of welding have not been tested, but it is suspected that similar phenomena are taking place. Practical implications: MIG method with micro-jet cooling `it is way to get better plastic properties of welds in relation to welds made by ordinary welding method. It is very important because it could be used to steering of mechanical properties of welded constructions. Originality/value: In this research welds made by new method of welding (welding with micro-jet cooling) were compare witch welds made by ordinary welding method. New method of welding is very promising and capable of industrial application, mainly due to the significant improvement of weld properties and quality.