Impact Tensile Strength of Laser Welded Butt Joint of Steel Sheets for Vehicles

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  • 自動車用鋼板レーザー突合せ溶接継手の衝撃引張変形強度
  • ジドウシャヨウ コウハン レーザー ツキアワセ ヨウセツ ツギテ ノ ショウゲキ ヒッパリ ヘンケイ キョウド

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The present study is concerned with the static and dynamic characteristics of laser welded joints related to the tailored blanks technique for vehicles. Three kinds of laser welded butt joints made of different steel sheets for vehicles, a mild steel HR270, high tensile strength steels HR590 and HR780, were used in the static and impact tensile tests. In the static test, all welded butt joint specimens showed that the tensile strength was similar to that of the base metal specimens corresponding to them, but the strain at fracture decreased. The measurement of the impact tensile strength of laser welded butt joints was performed by means of the modified split Hopkinson bar method for impact tensile test. The impact tensile strength of the laser welded butt joint of mild steel HR270 tended to increase comparing with the static one due to the effect of strain rate. On the other hand, regarding the high tensile strength steels of HR590 and HR780, the effect of strain rate was not recognized at about 320s-1. Thus the impact tensile strength and the fracture strain were almost same as the results in the static tests.

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