Abstract
This research paper presents hardness, structure and tensile strength analysis of 1460 alloy of Al-Cu-Li system, welded joints made by Tungsten Inert Gas (TIG) welding and Friction Stir Welding (FSW). Characteristics of acoustic noise at the welding operator workplace during mechanized TIG and FSW of aluminium-lithium alloy with the purpose to develop recommendations for the improvement of health and safety during welding processes were studied. Analyzing results, we concluded that during TIG welding the values of welding noise at the workplace, are much higher than the admissible noise level limit. Results showed that the values of the welding nose reach 95 dB. The noise level at the workplace for FSW is also dangerous and reaches up a value of 84.3 dB. Also, this paper presents hardness, structure, and tensile strength measurements of 1460 alloy welded joints made by TIG and FSW welding.
Highlights
Health and safety characteristics are one of the most important among the quality characteristics of welding technology
The objective of our research is to study the regularities of the formation of harmful factor as acoustic radiation during mechanized Tungsten Inert Gas (TIG) and at Friction Stir Welding (FSW) welding of aluminum alloy 1460 of Al-Cu-Li type
Formation of FSW permanent joint in solid-state phase allows eliminating the formation of cast coarse dendrite weld structure typical for fusion welding
Summary
Health and safety characteristics are one of the most important among the quality characteristics of welding technology. Unsatisfactory labor conditions during some welding technologies are closely related to the fact that the possibilities of lowering the level of harmful factors in the working zone using technological measures. The objective of our research is to study the regularities of the formation of harmful factor as acoustic radiation during mechanized TIG and at FSW welding of aluminum alloy 1460 of Al-Cu-Li type. We provided a recommendation for the improvement of health and safety at the welding operator workplace. Research of health and safety norms of noise at the workplace was conducted in the laboratory on the plates of 2 mm thickness of high-strength aluminum-lithium alloy 1460 (w/%: Cu-3% Li-2% Mg-1% Ti-0.12% Sc-0.08%). Chemical etching of the sheets was conducted by the generally accepted technology. Mechanical scraping of just the end face of the edges to be welded was performed for FSW, and for TIG surface layers 0.10 – 0.15 mm thick were scraped to avoid porosity in the welded joints
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