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Vol.47, No.12, 834 ~ 842, 2009
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| Title |
| A Comparative Study of Single-Phase AC and Inverter DC on Electrode Life for Resistance Spot Welded Electrogalvanized Steel Sheets |
| 손종우 Jong Woo Son , 박영도 Yeong Do Park , 강문진 Mun Jin Kang , 김동철 Dong Cheol Kim |
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| Abstract |
| A study on the welding of electrogalvanized TRIP (Transformation-Induced Plasticity) steels was done to compare the life of the electrode and the alloying phenomena on the electrode tip surface using single-phase AC and inverter-DC resistance welding processes. A longer life of the electrode (>200 welds) was achieved using the inverter-DC welding process. The tensile shear strength was higher in the electrode life test when welded with the inverter DC welding machine it maintained a higher value even when the welding nugget diameter was smaller than specified. When spot-welding was conducted using the single-phase AC welding process, a higher wear rate of the electrode was observed compared to that with the inverter-DC process. An alloying layer used to determine the rate of electrode growth showed differences in the metallurgical features of the surface alloying and Zn penetration depending on whether the single-phase AC process or the inverter-DC welding process was used. Moreover, changes in the dynamic resistance during the electrode life test were correlated with the electrode wear (or growth) rate. |
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| Key Words |
| single-phase AC welder, inverter DC welder, spot weld, electrode Life test, TRIP steel |
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