Study on Measures against Spot Weld Fracture of Ultra-High-Strength Steel Frame (Fourth Report)

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Other Title
  • 超高強度鋼板を適用した車体フレームのスポット溶接部破断対策の検討（第４報）
  • 超高強度鋼板を適用した車体フレームのスポット溶接部破断対策の検討(第4報)スポット溶接部周辺の熱影響部の破断対策の検討
  • チョウコウキョウド コウバン オ テキヨウ シタ シャタイ フレーム ノ スポット ヨウセツブハダンタイサク ノ ケントウ(ダイ4ホウ)スポット ヨウセツブ シュウヘン ノ ネツ エイキョウブ ノ ハダンタイサク ノ ケントウ
  • - Study on Measures against Fracture in Heat Affected Zone around a Joining Point by Spot Welding -
  • －スポット溶接部周辺の熱影響部の破断対策の検討－

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Abstract

Some ultra-high-strength steel frames with hat-shaped section and jointed flange by spot welding were given 4 point bending deformation. The validity of 4 point bending test system was confirmed by some simulation. The test system could give the frames constant moment in the wide range that was characteristic of 4 points bending condition. Also, by static and dynamic 4 point bending test, in case of the frames with short flange in cross direction, a crack occured in heat affected zone around spot welding point on the flange of the frames had fracture. On the other hand, the frames with large flange did not have fracture in the heat affected zone.

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