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Inverter DC resistance spot weldability of 590 MPa galvannealed steel for automotive applications

Yoon H., Kim D., Kang M.

Archives of Materials Science and Engineering

2011

Vol. 49, nr 2

112-117

Purpose: This study analyzes resistance spot weldability of coated and uncoated DP 590 steels. Design/methodology/approach: To compare the resistance spot weldability of coated (GAFC590, galvannealed) and uncoated (SPFC590) steels, tensile strength test and macro-section test were conducted for the resistance spot welds. Acceptable welding conditions were determined as a function of the resistance spot welding process parameters such as electrode force, welding time, and welding current. The lower limit of the welding lobe was the minimum shear tension strength for 590 MPa-grade steel while the upper limit was determined whether or not expulsion was detected. Findings: Galvannealed steel required more welding current than uncoated steel. Acceptable welding current condition and welding lobe were changed depending on whether steel is coated or not. Research limitations/implications: This study is forced on inverter DC resistance spot weldability of 590Mpa-grade steels for automotive application. Practical implications: This study confirms the weldability of galvannealed steel by comparing resistance spot weldability depending on whether or not the steels is coated. Originality/value: This study analysed resistance spot weldability depending on whether or not steel sheets are coated, where SPFC590 uncoated steel) and GAFC590 (galvannealed steel) were used. The required spot welding current for galvannealed steels was higher than the uncoated steel and welding lobes for coated and uncoated steels were determined.

Weldability of 440 MPa galvanized steel with inverter DC resistance spot welding process

Hwang I., Yoon H., Kang M., Kim D.

Archives of Materials Science and Engineering

2010

Vol. 42, nr 1

37-44

Purpose: This paper comparatively analyzes resistance spot weldability depending on whether or not 440 MPa-grade steel is galvanized at inverter DC spot welding. Design/methodology/approach: To compare the resistance spot weldability depending on whether or not the steel is galvanized, an inverter DC welding system was designed. Then, using this system, both tensile strength testing and macro-section testing were conducted on SPRC440 (uncoated steel) and SGARC440 (galvanized steel), and weldability was evaluated. Suitable welding conditions were calculated using the resistance spot welding variables such as electrode force, welding time and lobe diagram on the welding current. The low limit of the lobe diagram was set to the low limit of the tensile strength of 440 MPa-grade steel while the high limit was set depending on whether or not expulsion was detected. Findings: Compared to uncoated steel, galvanized steel had lower suitable welding current conditions and a narrower lobe diagram. Research limitations/implications: This paper compared resistance spot weldability and lobe diagram depending on whether or not 440 MPa-grade steel is galvanized. Practical implications: This paper confirms the weldability of galvanized steel by comparing resistance spot weldability depending on whether or not steel is galvanized. Originality/value: For analysis of resistance spot weldability depending on whether or not steel is galvanized, weldability was compared between SPRC440 (uncoated steel) and SGARC440 (galvanized steel) under the same welding conditions. As a result, compared to uncoated steel, galvanized steel had lower suitable welding current conditions and a narrower lobe diagram.