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首页> 外文会议>International Conference on Electronic and Mechanical Engineering and Information Technology >Study on mechanical properties and microstructure analysis of welded joints of 7A05 aluminum alloy by laser-MIG hybrid welding
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Study on mechanical properties and microstructure analysis of welded joints of 7A05 aluminum alloy by laser-MIG hybrid welding

机译：6A05铝合金焊接电气杂交焊的力学性能和微观结构分析研究

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摘要

7A05 aluminum alloy joints were fabricated by Laser-MIG hybrid welding, of which the tensile strength was tested at room temperature. The tensile fracture surfaces and microstructure were analyzed by SEM and TEM. The fracture surface analysis showed fracture morphologies of small dimple of 2～5μm on the heat affected zone (HAZ) and big dimple of 30～50μm on the weld bead. The fracture is inter-granular fracture with a small amount of cleavage fracture. TEM analysis showed that the HAZ region didn't exists η'-phase, but Al_3Zr, i.e., during welding thermal cycle, the joints appeared obvious η'-phase back dissolved so that lost η'-phase dispersion strengthening effect. O, Na and Fe impurities were detected in the joint, of which the crack originated during tensile testing. Both the impurities and η'-phase back dissolved are responsible for the degrading of the welded joints mechanical properties.
机译：通过激光 - MIG混合焊接制造了7A05铝合金接头，其中在室温下测试拉伸强度。通过SEM和TEM分析拉伸裂缝表面和微观结构。断裂表面分析显示，在焊接珠子上的热影响区（HAZ）和大浊度为30〜50μm的骨折形态。骨折是颗粒状骨折，少量裂解骨折。 TEM分析表明，HAZ区域不存在η'-相，但是在焊接热循环期间，接头出现明显的η'相背面溶解，使得损失η的相位分散强化效果。在关节中检测到o，Na和Fe杂质，其中裂缝起源于拉伸试验。溶解的杂质和η的副反相均负责焊接接头的降低机械性能。

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