LASER WELDING OF AA5056 ALUMINUM ALLOY JOINTS
Abstract
Butt joints are preferred when welding aluminum alloys. Welding of butt joints with full penetration is performed on removable substrates with grooves into which the molten metal flows together with slag. However, there is a wide range of industrial problems related to the need to manufacture structures using T-weld joints and lap joint. In this regard, solving the problem of welding such joints from aluminum alloys and working out welding technologies, which is the goal of this work, becomes relevant. The laser welding technology of 2.0 mm thick aluminum alloy АА5056 T-weld joints and lap joint was developed and the main technological parameters of the specified processes were determined. In order to prevent the failure of the laser equipment, experiments on laser welding were carried out with the vertical position of the seams, namely, the welding was carried out “from the bottom – up”. According to DSTU EN ISO 15614-11:2016, radiographic and visual control of the obtained welded joints, metallographic studies, mechanical tests were performed. The level of quality of welded joints, depending on the presence, type and size of defects, was evaluated according to DSTU EN ISO 13919-2:2015 “Welding. Connections made by electron beam and laser welding. Guidance on assessing the level of quality depending on defects. Part 2. Aluminum and its alloys”. The peculiarities of the formation of seams during welding with laser radiation of welded joints were determined and the search for progressive technological solutions was carried out in order to improve the properties of welded joints. The effectiveness of laser radiation welding to ensure the reliability of T-weld joints and lap joint from AA5056 aluminum alloy in the manufacture of samples with a thickness of 2.0 mm was determined. Predictive assumptions about the development of the object of research – the use of the obtained results for the creation of laser welding technologies based on them for use in the food, machine-building, chemical and other industries.
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