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Weld parameter and post weld heat treatment effects on 6xxx series friction stir weld properties.

机译:焊接参数和焊后热处理对6xxx系列搅拌摩擦焊性能的影响。

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摘要

This study is an investigation of the effects of weld parameters and post weld heat treatment on 6xxx series friction stir welds. This study was originally desired by the sponsors in order to quantify the effects of post-weld natural aging time on attainable weld properties. Welds were produced in AA6019-T651, AA6056-T651, and AA6056-T451 at low and high advance per revolution resulting in low and high power welds with low and high peak temperatures, respectively. For AA6019, tool rotation speeds of 720 and 1680 rpm were used with a tool traverse speed of 10.16 mm s-1. For AA6056, tool rotation speeds of 960 and 1680 rpm were used with a tool traverse speed of 10.13 mm s -1. These welds were naturally aged for periods ranging from 24, to 1200 hours prior to artificial aging to peak strength. A wide range of tests and analyses were performed in order to characterize the welding processes and the weld properties attained. These included: weld response variable analysis, nugget grain size measurements, weld zone hardness mapping, transverse and longitudinal tensile tests using digital image correlation to determine full-field strain, fracture toughness measurement, fractography, and FEA modeling of weld mechanical response.;Results showed that, in general, natural aging time was not a significant factor in determining the mechanical properties of the weld. The effect of advance per revolution on weld nugget asymmetry was pronounced for the AA6019 welds and was evidenced by grain size mapping, hardness distributions, and the spatial distribution of response to post-weld aging. Taken together, the results confirm that there is a definite temperature gradient, decreasing from the advancing to retreating sides of the nugget, most likely due to the predicted strain and strain rate gradients. Based on review of the literature, evidence for such gradients is common in precipitation hardening aluminum alloys; however, the nugget asymmetry is only obvious if the solution heat treatment temperature is attained over only part of the nugget.
机译:这项研究是调查焊接参数和焊后热处理对6xxx系列搅拌摩擦焊缝的影响。发起人最初希望进行这项研究,以便量化焊接后自然时效时间对可获得的焊接性能的影响。在AA6019-T651,AA6056-T651和A6055-T451中生产的焊缝,每转低速和高速前进,分别导致低功率和高功率焊缝以及低和高峰值温度。对于AA6019,使用的刀具转速为720和1680 rpm,刀具的移动速度为10.16 mm s-1。对于AA6056,使用了960和1680 rpm的工具转速,而工具的移动速度为10.13 mm s -1。这些焊缝在人工时效之前达到24至1200小时,然后自然时效至峰值强度。为了表征焊接过程和获得的焊接性能,进行了广泛的测试和分析。其中包括:焊接响应变量分析,熔核晶粒尺寸测量,焊接区硬度测绘,使用数字图像关联确定全场应变的横向和纵向拉伸测试,断裂韧性测量,分形图和焊接机械响应的FEA建模。结果表明,通常,自然时效时间并不是决定焊缝机械性能的重要因素。对于AA6019焊缝来说,每转前进对焊核非对称性的影响是明显的,并由晶粒尺寸图,硬度分布以及对焊后时效的空间分布证明了这一点。两者合计,结果证实存在一定的温度梯度,该温度梯度从熔核的前进侧至后退侧逐渐减小,这很可能是由于预测的应变和应变率梯度所致。根据文献综述,这种梯度的证据在沉淀硬化铝合金中很普遍。但是,只有在部分熔核上达到固溶热处理温度时,熔核的不对称性才很明显。

著录项

  • 作者

    Wade, Michael.;

  • 作者单位

    University of South Carolina.;

  • 授予单位 University of South Carolina.;
  • 学科 Engineering Mechanical.
  • 学位 M.S.
  • 年度 2009
  • 页码 149 p.
  • 总页数 149
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 机械、仪表工业;
  • 关键词

  • 入库时间 2022-08-17 11:37:35

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