Abstract:
The effects of welding current, electrode force, and welding time in a resistance spot weld were studied
to investigate the effectiveness of welded joints between a thin EN10130: DC04 material and a thicker
817M40 part, through analysis of the microstructural and mechanical properties. All welded specimens
were subjected to tensile testing at room temperature (25°C) and sub-zero temperature (–46°C) to test
the strength of the welded joints. No full button failure was observed at either room temperature or
sub-zero temperature after optimization of the weldng parameters. The fusion zone was observed to
consist mainly of martensitic phase, due to rapid quenching, while the HAZ was composed of clusters of
martensite in a ferrite and bainite matrix. The base 817M40 metal remained fully ferritic after welding.
The hardness was found to increase with increasing welding current. An increase in nugget size,
indicating good fusion of the weld, was observed with an increase in the welding current.
Description:
This paper was first presented
at the Mine-Impacted Water
from Waste to Resource Online
Conference, 10 and 12, 17 and 19,
3 and 24 November 2020.
