Estimation of Mechanical Properties of Welded Joints Produced by Resistance Spot Welding with Electromagnetic Stirring
DOI:
https://doi.org/10.20535/1810-0546.2014.1.26537Keywords:
Resistance spot welding, External electromagnetic fields, Static load tests, Mechanical properties of the jointsAbstract
The paper reveals investigation results of effect of external electromagnetic fields on mechanical properties of welded joints produced by resistance spot welding. Results of research of external electromagnetic fields effect on the mechanical properties of constructive and stainless steels and joints made from different materials were presented. Samples which are suitable for performing static-load tests of spot welding for the minimization of data misrepresentation were proposed and the analysis was performed. The results of shear and peel tests for different thickness samples made from structural steel St3, stainless steel 12X18Н10T were presented as well as those for different joints made from these materials. The tendencies of changes of mechanical properties for joints made from structural and stainless steels and for those made from different metals for different thicknesses and for different values of the external magnetic field induction were presented. Basing on the analysis of data obtained during the static-load tests the range of values of the external magnetic field was determined which allows producing the welded joints with the highest effect on their mechanical properties. The application of external electromagnetic fields in the spot welding with the optimal value of magnetic field induction of constructive and stainless steels and joints made from materials with different thickness allows increasing shear strength up to 10 % and tear strength – up to 50 %.References
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