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Mechanical behaviour and crack growth studies of gas tungsten arc butt welded joints of 31000-H2 (IS-737) aluminium alloy

KrishiKosh

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Title Mechanical behaviour and crack growth studies of gas tungsten arc butt welded joints of 31000-H2 (IS-737) aluminium alloy
 
Creator Rajiv Suman
 
Contributor Gope, P. C.
 
Subject sowing, biological phenomena, diseases, application methods, pathogens, fungi, planting, germinability, crops, irrigation
 
Description Thesis-PhD
Welding, as one of the most effective joining methods for metals, has been extensively applied in
engineering usage since a long time. The determination of microstructure and mechanical properties of
welded structures is thus of paramount importance to implement a damage tolerant approach to structural
life extension.
In this study, structural and mechanical properties evaluation of 31000-H2 (IS-737) Aluminium
Alloy after single pass Tungsten Inert Gas (TIG) welding were investigated to reveal the yield strength,
ultimate strength, percentage elongation, impact strength and hardness of welded joints. The TIG
Welding results of aluminium alloys 31000-H2 for 5 mm plate thickness using different filler materials
during welding are presented. Effect of welding was studied on four different zones such as parent Metal
(PM), weld metal (W), heat affected zone (HAZ) and combined zone of base Metal and heat affected
zone (W+H).
Welded specimens were investigated using scanning electron microscopy (SEM), UTM and
Rockwell micro-hardness tester. Scanning electron microscopy was used to characterize transition sites of
welded zone, HAZ, base metal and combined zone of base Metal and heat affected zone. Tensile test was
conducted to characterize weld strength by determining ultimate tensile strength and micro-hardness test
was conducted to characterize the homogeneity of welding in terms of mechanical properties.
Study of the interaction between the cracks and inclusions in thin plates is important in providing
a good understanding of mechanical behaviour of structures with defects, and is helpful to the material
and structural designs, especially in the fields of modern micro-electronic mechanics and material science.
It is well known that interaction of multiple cracks has major influence on the crack growth behaviour.
The problem of crack growth analysis in a welded joint containing multiple cracks is one of the major
problems, which is not focused in detail by the researchers. This problem in metal represents a complex
phenomenon. Hence, the present aim is focused in the experimental investigation of crack trajectory and
growth from the single cracks that present in a welded joint.
The effect of weld morphology on mechanical response and failure load in commercially
available 31000-H2 (IS-737) Aluminium alloy is focused. Crack acceleration, crack coalescence etc. are
the part of the present investigation. The purpose of this work is to shed light on some of the experimental
observations and computational concerns on crack growth due to presence of single crack in a welded
component under tensile, shear, pull out modes.
 
Date 2016-06-08T14:31:27Z
2016-06-08T14:31:27Z
2015-06
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/67025
 
Language en
 
Format application/pdf
 
Publisher G.B. Pant University of Agriculture and Technology, Pantnagar-263145 (Uttarakhand)