Effect of Temperature Control and Rotational and Traverse Speeds on the Mechanical Properties of Friction Stir-Welded Polypropylene Plates

In the present study, the effects of temperature and rotational and traverse speeds on the mechanical properties of polypropylene joints that are welded by friction stir welding using a non-rotational shoulder and a heat-assisted welding process is investigated. Tensile properties, microhardness mea...

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Bibliographic Details
Published in:Polymers 2024-11, Vol.16 (22), p.3110
Main Authors: Balaguera, Miguelangel, Zambrano, Habib R, Chamorro Coneo, Ramiro J, Santa Marín, Juan Felipe, Unfried-Silgado, Jimy
Format: Article
Language:English
Subjects:
Crystal defects
Crystallinity
Ductile fracture
Ductile-brittle transition
Efficiency
Factorial experiments
Friction stir welding
Hardness
High density polyethylenes
Investigations
Mechanical properties
Microhardness
Polypropylene
Temperature control
Temperature effects
Tensile properties
Thermal analysis
Variance analysis
Welded joints
Welding
Welding parameters
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Summary:In the present study, the effects of temperature and rotational and traverse speeds on the mechanical properties of polypropylene joints that are welded by friction stir welding using a non-rotational shoulder and a heat-assisted welding process is investigated. Tensile properties, microhardness measurements, microscopy observations, and thermal analysis are carried out in the present research to evaluate the effect of the welding parameters on the mechanical properties of welded joints. The experiments are conducted and analyzed by means of a central composite design using an analysis of variance (ANOVA). Variations in pre-heating temperature from 60 °C to 80 °C, rotational speed from 800 to 1500 rpm, and traverse speed from 20 mm/min to 100 mm/min are made for observations. A remarkable joint efficiency of 94% is achieved with joints that are free of discontinuities and defects. The fractured surfaces are observed to identify ductile and brittle zones. The crystallinity is measured, and a correlation between crystallinity and joint strength is discussed. The sample with highest efficiency shows 65% crystallinity and a ratio of 37.9% of ductile zone-total fractured area.
ISSN:2073-4360
2073-4360
DOI:10.3390/polym16223110