ABSTRACT

Weaving amplitude and welding energy were varied in order to investigate the effects of the weaving technique in metallurgical aspects and mechanical properties of welds produced via SAW process. This investigation and subsequent discussion were based on metallographies and Vickers microhardness tests, both performed on the cross section of the weld beads. The application of the weaving technique resulted in metallurgical changes in the Fusion Zones (FZ), indicating grain refinement, for all studied welding energies. A 10 mm weaving amplitude was enough to promote metallurgical changes on the FZ edges, but additional 10 mm were necessary to show proportional changes in the FZ center. In the Vickers microhardness tests, a subtle microhardness increase was observed for a weaving amplitude of 20 mm when compared to the reference sample (no weaving movement applied). The weaving technique applied to the SAW process showed great potential, since it yields superior or, at least, comparable weld beads to those produced via SAW process with no weaving, in metallurgical aspects and mechanical properties, while producing weld beads with typical morphology of welding with weaving.

摘要

改变编织幅度和焊接能量，以便研究编织技术在通过SAW工艺生产的焊缝的冶金方面和机械性能方面的影响。这项研究和随后的讨论基于金相和维氏显微硬度测试，均在焊缝的横截面上进行。编织技术的应用导致所有研究的焊接能量在熔合区（FZ）中发生冶金变化，表明晶粒细化。10 mm的编织振幅足以促进FZ边缘的冶金学变化，但还需要增加10 mm才能显示FZ中心的比例变化。在维氏显微硬度测试中，与参考样品相比，编织幅度为20 mm时，观察到微硬度的增加（不施加编织运动）。应用于SAW工艺的编织技术显示出巨大的潜力，因为在冶金方面和机械性能方面，与在不进行编织的SAW工艺生产的那些相比，其产生的冶金焊珠和机械性能优于或至少优于SAW工艺生产的焊珠，同时产生具有典型焊接形态的焊珠编织。