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| 1 | CO_2 laser-micro plasma arc hybrid welding for galvanized steel sheets显示文摘A laser lap welding process for zinc-coated steel has a well-known unsolved problem-porosity formation. The boiling temperature of coated zinc is lower than the melting temperature of the base metal, which is steel. In the autogenous laser welding, the zinc vapor generates from the lapped surfaces expels the molten pool and the expulsion causes numerous weld defects, such as spatters and blow holes on the weld surface and porosity inside the welds. The laser-arc hybrid welding was suggested as an alternative method for the laser lap welding because the arc can preheat or post-heat the weldment according to the arrangement of the laser beam and the arc. CO2 laser-micro plasma hybrid welding was applied to the lap welding of zinc-coated steel with zero-gap. The relationships among the weld quality and process parameters of the laser-arc arrangement, and the laser-arc interspacing distance and arc current were investigated using a full-factorial experimental design. The effect of laser-arc arrangement is dominant because the leading plasma arc partially melts the upper steel sheets and vaporizes or oxidizes the coated zinc on the lapped surfaces. Compared with the result from the laser-TIG hybrid welding, the heat input from arc can be reduced by 40%. | C.H.KIM Y.N.AHN J.H.KIM | 2011 | Transactions of Nonferrous Metals Society of China2011，21，A01： | 6 |
| 2 | Effects of Weaving Laser on Weld Microstructure and Crack for Al 6k21-T4 Alloy显示文摘For Al 6k21-T4 overlap weld joint,the shear-tensile strength by using the weaving laser was improved as compared to the case of linear laser.For the specimen of low strength,the porosity was distributed continuously along the intersection between the plates and fusion line.However,for the optimized welding condition,large oval-shaped porosities were located only in the advancing track of the concave part.Therefore,the continuity of cracks and porosities played a key role to determine the strength.And,the weaving width was also the important parameter to control the strength.Furthermore,the concave part had more significant hot and cold cracking in the weld and heat-affected zone(HAZ),respectively,than the convex part. | B.H.Kim N.H.Kang W.T.Oh C.H.Kim J.H.Kim Y.S.Kim Y.H.Park | 2011 | Journal of Materials Science & Technology2011，27，1： | 2 |
| 3 | Doping behaviors of dysprosium,yttrium and holmium in BaTiO3ceramics显示文摘 | K.J.Park C.H.Kim Y.J Yoon | | 0，，02： | 1 |
| 4 | Ultra-wideband(UWB)ring resonator bandpass filter with a notched band显示文摘 | C.H.Kim K.Chang | | 0，，： | 1 |
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