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采用多种软件的综合运用建立了整体叶盘的有限元模型,并基于焊接过程中温度之间相互影响程度选取了顺序依次焊接、90°和180°三种典型的焊接顺序,通过有限元分析的方法对不同焊接顺序产生的变形进行计算和分析.结果表明,以往使用的180°最远距离焊接顺序并不是最合理的焊接顺序,在相同的焊接工艺条件下,顺序依次焊接对整体叶盘圆度的影响相对较小.该分析结果说明在材料不同、焊接方法及结构不同的情况下,焊接顺序没有固定的模式,为整体叶盘及大型复杂结构件焊接顺序的合理选择提供了理论依据. 相似文献
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曲伸 《仪表技术与传感器》1988,(2)
美国杂志《激光集锦与光电工艺》1987年第三期发表文章说,通过对有代表性的13家厂商的调查结果表明,光学镀膜设备制造业仍是一个处于兴旺、发展的行业。 一、发展趋势 Danavac公司的Willian F.Murphy指出在镀膜工业中的最新趋势有:采用隔离的净化房、自动化、监控系统、低温泵系统 相似文献
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Aero-engine blisk welded by electron beam welding(EBW) method is a complicated structure. Fixtures were used to control the deformation of blisk during its manufacturing process. Finite element method was utilized to study the evolution of the welding residual stress and deformation of this structure. In which an attenuation function was applied to the double ellipsoid heat source model based on the characteristic of EBW, and the effects of fixtures on the welding residual stresses and deforamtion were also reserached. The simulation results showed that the temperature contour of weld cross section vertical to the weld centerline followed a “V” shape. Moreover, large welding residual stress and distortion were found in the interface between blisk and fixtures. The stress concentration was reduced sufficiently in starting and end part of weldment as the fixtures were removed after welding process, while the removing operation had almost no effects on the welding residual stress in the middle section of weld bead. 相似文献
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结合GH4169高温合金表面损伤的修复需求,研究基体预热对不同基体厚度的激光沉积修复GH4169高温合金试样残余应力、显微组织、拉伸性能的影响规律。结果表明:与未预热修复试样相比,基体预热300℃的GH4169合金激光沉积修复试样的残余应力σx、σy均明显降低,修复区枝晶间析出的Laves相变得粗壮并呈现颗粒状的碎化趋势,抗拉强度略微降低,但断后伸长率提高60%以上,达到锻件标准。基体厚度越大,修复体厚度越小,修复试样的残余应力减小,枝晶间析出的Laves相减少,抗拉强度与断后伸长率均略有增加。 相似文献
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采用圆波和三角波两种扫描模式,在不同的扫描幅度下对高温合金GH4169进行电子束焊接试验,分析焊接接头的成形情况、焊缝尺寸、接头横截面的宏观形貌和显微组织。结果表明,圆波比三角波扫描模式焊缝成形差,随着扫描幅度的增加,两种扫描模式下焊缝成形均变差。当扫描幅度超过2 mm时,容易产生咬边缺陷。随着扫描幅度的增加,焊缝的成形系数增加。非扫描情况下,焊缝中心两侧柱状晶夹角接近180°,而在扫描情况下,焊缝中心两侧柱状晶夹角接均小于180°,圆波模式比三角波模式柱状晶夹角大。 相似文献