摘要本论文以体积分数为20%的SiC颗粒增强铝基复合材料为研究对象，进行了TIG焊和基于6061铝合金中间层的等离子焊，利用金相显微镜、扫描电镜及能谱分析、显微硬度测试和抗拉强度测试等手段，研究了焊接方法，焊接工艺和中间层对接头宏观形貌、微观组织和力学性能的影响。
试验结果表明：采用TIG焊，当焊接电流为130A，焊接电压为13V，焊接速度为90cm/min，焊接线能量为1.13KJ/cm时，可以获得良好的焊缝宏观形貌。采用等离子焊，焊接电流为100A，焊接电压为30V，焊接速度为90cm/min，中间层厚度为1.2mm时，所得焊缝宏观形貌与TIG焊相比得到了较好的改善；采用TIG焊时，焊缝区发生界面反应生成Al4C3针状脆性组织，焊缝和热影响区产生大量气孔，随着焊接热输入的增大，界面反应加剧，气孔增多。采用等离子焊时，所得焊缝中母材与中间层熔合较好，焊缝中气孔明显减少，界面反应得到了很好的改善；采用TIG焊时，热影响区硬度逐渐升高，在熔合线处硬度达到最大值110HV，焊缝区硬度降低，等离子焊接头硬度变化趋势与TIG焊接头相似，并没因铝合金中间层的加入而降低。TIG焊接头最高抗拉强度为25MPa，等离子焊接头最高抗拉强度为36MPa，基于中间层的等离子焊接头强度相比TIG焊有所提高。7244
关键词 铝基复合材料 TIG焊 等离子弧焊
毕业设计说明书（论文）外文摘要
Title Study on Welding Method of Sic-Reinforced Aluminum Composite
Abstract
This paper mainly studies 20% of the volume fraction of SiC/6061 aluminum matrix composites welding. We tried TIG and plasma welding. OM(optics microscopy),SEM(scanning microscopy) ,Energy Dispersive X-ray Detector , Micro-hardness and Tensile experiments were used to analysis how the appearance, microstructure and mechanical were influenced by the welding method, welding process and the filling metal.
The results show that for TIG welding, in the welding current for 130A, welding voltage of 13V, welding speed of 90cm/min, and heat input of 1.13KJ/cm, the joint quality is the best. For plasma welding, in the welding current for 100A, welding voltage of 30V, welding speed of 90cm/min, and 1.2mm of layer, the plasma joint’s appearance is better than the TIG joint’s. When we used TIG welding, the weld area and affected zone produced the large amount of air holes. The high the current is, the more the air holes are. When we use plasma welding with the filler, the base metal and the middle layer fusion better. The air holes decrease. And the interface reaction decrease. When we used TIG welding, the hardness of HAZ increases . The fusion line is the maximum of 110HV.And the weld zone is the minimum. The hardness of the joint of plasma welding is alike with TIG welding. When we use TIG welding, the highest tensile strength is 25MPa. When we use plasma welding, the tensile strength is 36MPa.
Keywords: aluminum matrix composites TIG welding plasma welding
目 次
1 引言 1
1.1课题的意义 1
1.2铝基复合材料焊接特点与难点分析 1
1.3铝基复合材料研究现状 2
1.4论文研究的内容 5
2试验准备及方法 5
2.1试样材料 5
2.2 试验设备 6
3 铝基复合材料的焊接工艺试验研究 8
3.1试验方法与研究方案 8
3.2TIG焊工艺试验研究 9
3.3等离子焊工艺试验研究 9
4铝基复合材料TIG焊焊接接头性能分析 10
4.1 焊缝宏观形貌分析 10
4.2接头微观组织分析 13 铝基复合材料焊接方法研究+文献综述:http://www.youerw.com/cailiao/lunwen_5114.html