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Weldability of pulse GMAW joints of 780 MPa dual-phase steel

So W., Kang M., Kim D.

Archives of Materials Science and Engineering

2010

Vol. 41, nr 1

53-60

Purpose: This paper assesses the gap bridgeability of pulse GMAW joints of DP 780 for automobile body. Design/methodology/approach: Wire melting was analyzed using a high-speed camera. The impact of EN ratio on the shape of the bead section was examined after analyzing the macrosection of welding which was obtained on a bead-on-plate-welding experiment. Welding conditions that are robust to the gap were suggested through an analysis on tensile strength, macrosection of the weld and fracture appearance of tensile strength testing at the lap joint welding of DP 780. Findings: A relation among the welding current (welding process parameter of AC pulse GMAW), EN ratio, welding speed and bead shape parameters which include bead width, bead height and penetration were computed. Research limitations/implications: The suitable welding conditions proposed in this paper can change because of types of welding joints thickness of base metal and other reasons. Practical implications: In this study, the suitable welding conditions were presented for securing a good weld quality of DP 780 for the automobile body. Originality/value: Through this study, the correlation between the weld bead geometry and the EN ratio in the AC pulse GMAW was confirmed. Though the weld quality assessment, suitable pulse GMAW conditions of DP 780 were suggested.

Effect of flash butt welding parameters on weld quality of mooring chain

Kim D., So W., Kang M.

Archives of Materials Science and Engineering

2009

Vol. 38, nr 2

112-117

Purpose: The effects of flash butt welding parameters on mechanical properties were explored for mooring chain for offshore structure. Design/methodology/approach: Through the tensile strength, impact energy, hardness of weld, macrosection, microstructure and waveform analysis of the flash butt weld, following the change of the flash mode, flash length, upset mode, and upset length which are the parameters of the flash butt welding, the weld quality has been assessed. Findings: It is confirmed that even if the mechanical properties of the weld are satisfied through experiments, a weld defect may exist, and in case of using force mode in upset process, the mechanical characteristics of the weld is superior to position mode. Research limitations/implications: The optimal welding condition presented in this study may be changed in accordance with the chemical composition of the material, size of mooring chain. Practical implications: In this study, the suitable welding conditions were presented for securing a good weld quality of the high strength steel mooring chain for the offshore structure. Originality/value: Through this study, the correlation between the weld parameters and the weld quality in the flash butt welding was confirmed. Though the weld quality assessment, flash butt welding condition of the ř84 mm mooring chain for the offshore structure was presented.