激光焊接6156-T4鋁合金對接與T型接頭的性能對比

激光焊接6156-T4鋁合金對接與T型接頭的性能對比Property Comparison of Laser Welded Butt Joint and T-joint of 6156-T4 Al Alloy

用拉伸試驗機、疲勞試驗機、掃描電鏡等對激光焊接6156-T4鋁合金對接接頭和T型接頭的拉伸性能、疲勞性能和斷口形貌進行了對比研究。結果表明：對接接頭的拉伸性能接近于母材的，T型接頭的抗拉強度較母材的有一定程度的降低，對接接頭的疲勞強度明顯高于T型接頭的；對接接頭疲勞斷口位于熱影響區(qū)，T型接頭的斷口穿過熱影響區(qū)和母材；兩種接頭疲勞裂紋均萌生于應力集中較為嚴重的焊趾部位，以近似半橢圓的形狀沿厚度方向擴展直至接頭斷裂。

The tensile property, fatigue property and fracture morphology of the laser welded butt joint and T-joint of 6156-T4 Al alloy were researched and compared using the tension testing machine, fatigue tester, scanning electron microscope, etc. The results show that the tensile property of the butt joint was close to that of the base metal, while the tensile strength of T-joint decreased to a certain extent comparing to that of the base metal. The fatigue strength of the butt joint was obviously higher than that of the T-joint. The fatigue fracture of the butt joint was in the heat affected zone while that of the T-joint was across the heat affected zone and base metal. The fatigue cracks of the two joints initiated from the weld toe, at which the stress concentration was relatively serious, and then propagated in a shape of approximate semi-ellipse along the plate thickness direction until the joint fracture.

全文下載：https://pan.baidu.com/s/1bIJIAq