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Effect of EN Ratio in Welding Current Waveform on the Properties of MIG/MAG Welded Joints Made of Various Structural Materials

Kiszka A., Pfeifer T.

Biuletyn Instytutu Spawalnictwa w Gliwicach

2014

Vol. 58, No. 5

122--130

The article presents the use of VP current for welding thin elements of various structural materials, describes the course of tests and discusses the test results related to the determination of the effect of EN ratio in the current and arc voltage waveforms on the weld geometry, penetration depth and welded joint quality.

Przedstawiono zastosowanie prądu o zmiennej biegunowości do spawania elementów z różnych materiałów konstrukcyjnych o niewielkiej grubości. Przedstawiono przebieg i wyniki badań nad określeniem wpływu udziału składowej ujemnej w przebiegu prądu i napięcia łuku na geometrię spoiny, głębokość wtopienia oraz jakość połączeń spawanych.

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.