Effects of pulsing current and filler materials on the mechanical and metallurgical properties of DSS 2205 weldments

This paper compares the mechanical properties of different natural fiber composites produced by rotational molding as a way of waste valorization from campaigns to control invasive plant species in Macaronesia. Rotomolded parts produced with polymeric matrices (polyethylene) and filled with up to 20% by weight of cellulosic fibers obtained from Arundo donax L., Pennisetum setaceum, and Ricinus communis plants were characterized in terms of tensile, flexural, and impact strength. It was found that the sieving of natural fibers allowed for their introduction in higher loadings, from 10 (for un-sieved material) to 20%; fiber size greatly affected the mechanical properties of the final parts, although some combinations were proven not to reduce the mechanical properties of the neat resin. This study is a first approach to the valorization of residues obtained from periodic campaigns of the control of invasive species performed by public authorities, usually at the local level. It is important to highlight that the main objective of this research did not focus on economically profitable activity; instead, it was focused on the reduction of wastes to be disposed from ecosystem maintenance actions and the investment of potential income into preservation policies.

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Investigations on arc brazing for galvanized heavy steel plates in steel and shipbuilding

Welding in the World ◽

10.1007/s40194-021-01087-2 ◽

2021 ◽

Author(s):

Philipp Andreazza ◽

Andreas Gericke ◽

Knuth-Michael Henkel

Keyword(s):

Low Cost ◽

Thin Sheet ◽

Steel Structures ◽

Tensile Tests ◽

Fatigue Tests ◽

Steel Plates ◽

Galvanized Steel ◽

Filler Materials ◽

Static Tensile ◽

Brazed Joints

AbstractArc brazing with low-melting copper-based filler materials, which has long been established and standardized in the thin sheet sector, offers numerous advantages in the processing of predominantly electrolytically galvanized steel structures. In steel and shipbuilding, on the other hand, equipment parts made of thick steel sheets are hot-dip galvanized at low cost and with good corrosion-inhibiting properties. Quality welding of such constructions is not possible without special precautions such as removing the zinc layer and subsequent recoating. With regard to greater plate thicknesses, arc brazing was analyzed in these investigations as an alternative joining method with regard to its suitability for practical use. Within the scope of the investigations, CuSi3Mn, CuMn12Ni2, and four different aluminum bronzes were examined on different sheet surface conditions with regard to the geometrical and production parameters. This was carried out by build-up and connection brazing, executed as butt and cross joints. Quasi-static tensile tests and fatigue tests were used to assess the strength behavior. In addition, metallographic analyses are carried out as well as hardness tests. The suitability for multi-layer brazing and the tendency to distortion were also investigated, as well as the behavior of arc brazed joints under corrosive conditions.

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Efficiency of using filler materials in laser welding of high-strength aluminium–lithium alloys

Welding International ◽

10.1080/09507116.2017.1315073 ◽

2017 ◽

Vol 31 (9) ◽

pp. 717-721 ◽

Cited By ~ 2

Author(s):

E. N. Kablov ◽

V. I. Lukin ◽

V. V. Antipov ◽

E. N. Ioda ◽

M. D. Panteleev ◽

...

Keyword(s):

Laser Welding ◽

High Strength ◽

Filler Materials ◽

Lithium Alloys

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Effect of Ceramic Fillers on Mechanical Properties of Bamboo Fiber Reinforced Epoxy Composites: A Comparative Study

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.123-125.1031 ◽

2010 ◽

Vol 123-125 ◽

pp. 1031-1034 ◽

Cited By ~ 12

Author(s):

Sandhyarani Biswas ◽

Alok Satapathy ◽

Amar Patnaik

Keyword(s):

Mechanical Properties ◽

Silicon Carbide ◽

Red Mud ◽

Synergistic Effects ◽

Bamboo Fiber ◽

Industrial Wastes ◽

Epoxy Composites ◽

Void Content ◽

Filler Materials ◽

Fiber Reinforced

In order to obtain the favoured material properties for a particular application, it is important to know how the material performance changes with the filler content under given loading conditions. In this study, a series of bamboo fiber reinforced epoxy composites are fabricated using conventional filler (aluminium oxide (Al2O3) and silicon carbide (SiC) and industrial wastes (red mud and copper slag) particles as filler materials. By incorporating the chosen particulate fillers into the bamboo-fiber reinforced epoxy, synergistic effects, as expected are achieved in the form of modified mechanical properties. Inclusion of fiber in neat epoxy improved the load bearing capacity (tensile strength) and the ability to withstand bending (flexural strength) of the composites. But with the incorporation of particulate fillers, the tensile strengths of the composites are found to be decreasing in most of the cases. Among the particulate filled bamboo-epoxy composites, least value of void content are recorded for composites with silicon carbide filling and for the composites with glass fiber reinforcement minimum void fraction is noted for red mud filling. The effects of these four different ceramics on the mechanical properties of bamboo- epoxy composites are investigated and the conclusions drawn from the above investigation are discussed.

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