Abstract
The main aim of this study is to determine the best process parameters for the robotized Gas Metal Arc Welding (GMAW) of LNE 700 advanced high-strength steel. This article evaluates some quality criteria such as the microhardness, the heat-affected zone (HAZ) and the convexity in the welded joints. The assays are performed using an experimental design, based on the Taguchi method. The analysis of the results identified some factors of greatest influence and how best to combine them to determine an optimum condition for welding LNE 700 high strength steel. Moreover, the influence of welding parameters on quality criteria is determined.
Highlights
Given the constant increase in the world’s population and existing centers of large concentrations of people, governments of several countries are encouraging projects that target ways by which vehicles of collective transport need to use smaller amounts of fossil fuels and emit less carbon dioxide (CO2)
The process parameters were defined in accordance with the greatest influence on quality criteria, which are often adjusted in accordance with the type of material to be welded
The microhardness profile found in each test specimen showed an average hardness of 270 Vickers for the base metal and 255 Vickers for the heat-affected zone (HAZ)
Summary
Given the constant increase in the world’s population and existing centers of large concentrations of people, governments of several countries are encouraging projects that target ways by which vehicles of collective transport need to use smaller amounts of fossil fuels and emit less carbon dioxide (CO2). With the view of reducing the weight of these vehicles, factories work on developing the design of structural parts using new types of steel, which let thinner materials (thinner sheets) to be applied without this affecting their structural strength and structures with welded joints of dissimilar metals [2,3]. This industry needs steel mills to develop new steels which have high strength, are easy to weld and have considerable levels of ductility and toughness
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