In this work, it is proposed to make by additive manufacturing through 3D printing with FDM technology FDM (Fused Deposition Modeling - Modeling by Depositing Fusible Filament) some landmarks of the washing head which is common to the light water well drilling rigs FA100, FA125, FH150 and FG40. A washing head like the FA100 washing head, which has the casing and the drilling fluid supply fittings, 3D printed from PETG and ABS+ filament, has never been made in Romania. The main advantages of using this manufacturing technology are that by purchasing such equipment, a large number of different landmarks can be made and the final price of the landmark.

The use, on a larger scale, of brazed aluminum alloys in the aerospace industry led to the need for a detailed study of the assemblies behavior. These are built from 6061 aluminum aloy (3L59) brazed with aluminum aloy A103. Therefore, a finit element simulation (FEM) of durability is necessary, that consists in the observation of gradual deterioration until failure. These studies are required and are previous to the stage of the producing the assembly and test it by traditional methods.

There are many welded structures in the world such as bridges and viaducts that are subject to fatigue. Some of these structures, generally made of non-alloy or low-alloy steels, have been put into operation many years ago and have accumulated a large number of variable load cycles over time. For this reason, the occurrence of the fatigue phenomenon is inevitable and consists in the occurrence of failures at stresses applied to the structure, below the yield limit of the material. These stresses under the static loads would not cause the failures to appear. This paper will investigate if the ecological reconditioning techniques “weld toe grinding” and “WIG re-melting weld toe,” influence favourably the behaviour of the welded structures made from HSLA steel, in static and variable loads, if the application of these techniques is justified in both cases and finally which is the environmental impact of applying these techniques. In the paper we will present the chemical composition and mechanical properties of the base and filler materials, micro and macrostructures, graphics with the variation of the micro-hardness, we will perform static and fatigue tensile tests and we will rise the durability curve in the case of the fatigue tests. We will also present a mathematical computational algorithm, which highlights the extent to which these ecological rehabilitation techniques pollute the environment. It is more efficient both for technological and ecological reasons to recondition a product than to manufacture it from the very beginning.

The evaluation of the performance of a mechanical system takes into account many factors, including those related to competitiveness, technology and reliability.From the point of view of competitiveness, most companies use the same state-of-the-art information obtained either by applying their own research, development and innovation resources, or by purchasing technologies and patents from other companies or from the free market. Thus the resulting products, if not innovative products, are part of the same range.The global technological level has reached a very high degree of development, using unconventional technologies with high precision, robots, advanced mechanical systems and assembly lines with high productivity as well as verification and control systems on manufacturing flow which makes production to be uniform.Differences between manufacturers begin to appear when the degree of customer satisfaction changes, which is also found in the concept of reliability. Thus, the one who will find the technological solution with the same number of parts, but with a high reliability, will win the market.The paper aims at a detailed study with direct reference to how to increase reliability at the design stage.

This work deals with the additive manufacturing by 3D printing of the Gas Reduction R2-M60x2 landmark which is part of the Gas Reduction R2-Hose DN 2 in subassembly. This sub-assembly is a component part of the washing head of the light water well drilling installations FA 100, FA 125, FH 150 and FG 40. The generic name of the washing head will be FA 100. We use 3D printing technology because, on the one hand, it is technically possible to make the part and on the other hand, for economic reasons. It is approximately ten times cheaper to make the part through 3D printing than through conventional technologies.

It presents an element of absolute novelty for industrial scientific research in Romania, the fact that the housing of the washing head and other landmarks of the washing head from the FA100 water well drilling installations. FA125, FH150 and FG40 were made by additive manufacturing by 3D printing with PETG and ABS+ filament.