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首页> 外文期刊>Advances in materials science and engineering >Laser Beam Welding of AA5052, AA5083, and AA6061 Aluminum Alloys
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Laser Beam Welding of AA5052, AA5083, and AA6061 Aluminum Alloys

机译：AA5052，AA5083和AA6061铝合金的激光束焊接

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The present investigation was mainly concerned with characteristics of autogeneous laser butt welding of 2 mm thickness nonheat treatableAA5052-H12,AA5083-H12 and 2 mm, 3 mmthickness heat treatableAA6061-T6aluminum alloys. The effect of laser welding parameters,surface cleaning, filler wire addition, and backing strip on quality of laser welded joints was clarifiedusing 5 kWCO2laser machine. It was found that all the investigated alloys showed tendencies for porosity and solidification cracking,particularly, at high welding speed (≥4 m/min). Porosity was prevented by accurate cleaning of thebase metal prior to welding and optimizing the flow rate of argon shielding gas. Solidification crackingwas avoided through two different approaches. The first one is based on the addition of filler metalas reported in other research works. The other new approach is concerned with autogeneouswelding using a backing strip from the same base metal, and this could be applicable in production. Preventing solidification cracking in both cases was related mainly to a considerable decrease in thestress concentration at the weld metal center as a result of improving the fusion zone profile. The implementation of the new approach could help in producing weldments with a better quality dueto the absence of the filler metal, which is known as a source for hydrogen-related porosity. It canalso have a positive economic aspect concerning the manufacturing cost since welding is donewithout the addition of filler metal. Not only quality and economic positive aspects could beachieved, but also high productivity is another feature since high quality autogeneous weldments wereproduced with high welding speed, 6 m/min. Hardness measurements and tensile test of AA6061 alloy welds indicated a remarkable softening of the fusion zone due to dissolution of the strengthening precipitates, and this was recovered by aging treatment after welding. For alloys AA5052 and AA5083, softening of the fusion zone due to theloss of its work-hardened condition was much less in comparison with AA6061 alloy.
机译：目前的研究主要涉及2μmm厚度不可热处理的AA5052-H12，AA5083-H12和2μmm，3μmm厚度可热处理的AA6061-T6铝合金的自生激光对焊特性。使用5 kWCO2激光机，弄清了激光焊接参数，表面清洁，添加焊丝和衬条对激光焊接接头质量的影响。结果发现，所有研究的合金都表现出孔隙率和凝固裂纹的趋势，特别是在高焊接速度（≥4μm/ min）下。通过在焊接之前精确清洁母材并优化氩气保护气体的流速，可以防止孔隙。通过两种不同的方法避免了固化裂纹。第一个是基于其他研究工作中报道的填充金属的添加。另一种新方法涉及使用来自相同母材的衬板进行自动焊接，这可能适用于生产。两种情况下防止凝固裂纹的主要原因是由于改善了熔合区轮廓，使焊接金属中心的应力集中大大降低。由于没有填充金属，这种新方法的实施可能有助于生产质量更高的焊件，而填充金属是氢相关孔隙的来源。由于无需添加填充金属即可完成焊接，因此在制造成本方面也具有积极的经济意义。由于可以以6μm/ min的高焊接速度生产出高质量的自生焊件，因此不仅可以解决质量和经济方面的问题，而且高生产率也是另一个特点。 AA6061合金焊缝的硬度测量和拉伸试验表明，由于强化沉淀物的溶解，熔合区显着软化，并且通过焊接后的时效处理得以恢复。对于AA5052和AA5083合金，与AA6061合金相比，由于其加工硬化条件的损失，熔化区的软化要少得多。

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