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Generally, the welding process isa complex phenomenon that is a consequence of heat transfer, the transformation of the structure of the material and mechanical properties.
In the analysis conducted by the finite element method, we took the same thermo-physical and thermo-mechanical properties of the base and filler materials.
Thermo mechanical properties of materialS355.
For the analysis, this used the model of welded plates with the same geometry shown in Fig. 1 and the material properties in Table 1.
The obtained values ​​of J-integral were calculated on the basis of linear elastic fracture mechanics and the properties of the integral independent of the path around the crack tip.

The thermal induced stresses occur due to high temperatures that are locally generated by machining parameters, material properties (low thermal conductivity), tools state (i.e. intensive flank wear), cooling conditions etc.
Experimental Conditions The study was carried out for two types of materials with mechanical properties according to Table 1 carbon steel (CU 45 – K945) and aluminium alloy (Al 6061T6).
Residual stress acquisition system Influence of Different Factors on the Distribution of Temperature and Mechanical Generated Stresses Residual Stress Distribution Before Milling.
Nanoindentation and FEM study of the effect of internal stress on micro/nano mechanical property of thin CNx films.
Influence of residual stresses on the mechanical properties of TiCN thin films deposited by arc evaporation.

There is so much work done on different factors of geopolymers.
Geopolymerization depends on many factors including chemical composition of raw material, Si/Al ratio, Solid/Water ratio, Sodium hydroxide concentration, water content, curing time and temperature etc [1].The author [4, 5] showed that geopolymers give optimum properties by using raw material as fly ash with sodium hydroxide and sodium silicate solution.
Whereas the decrease in mechanical strength after Si/Al 2:1 (Si/Al 2.5 and 3) suggest that the high quantity of silica affects the mechanical property.
"Effect of mechanical activation of fly ash on the properties of geopolymer cured at ambient temperature." 
"The effect of alkali and Si/Al ratio on the development of mechanical properties of metakaolin-based geopolymers." 

The properties of welded joint will been improved by these fine crystal grain.
Those are not better for the properties of welded joint.
The molten pool will be affected when the arc rotates.
Conclusions (1) The optimal mechanical properties will be obtained when Im=2A, f=20Hz, which the ultimate tensile strength is 231Mpa and the micro-hardness is 76.2HV
The properties of welded joint will be improved by these fine crystal grain.

The mechanical properties and durability of repairing mortar were studied.
The results show that the repairing mortar has good mechanical property, obviously anti-abrasion property and excellent bonding performance.
These damages have affected the safe working and service life of hydraulic structures.
The mechanical properties such as compressive, flexural and tensile strength, bond strength between repair mortar and repairing concrete base and durability such as abrasion resistance, anti-carbonation and impermeability performance were studied in this paper.
The anti-abrasion property of repairing mortars was estimated by wear rate and anti-abrasion strength respectively. 2.2 Results and Analysis 2.2.1 Mechanical properties of repairing mortar Table 1 shows the result of mechanical properties of repairing mortar at different age.

And weld line products cause many problems, such as appearance, size and mechanical properties of the drops, also can lead to deformation.
The properties on the direction of the flow of the molten plastic.
Weld line selection has a great influence to the position of the gate, and at the same time, the generation of fusion line also has its own features, to comprehensively consider the material properties, temperature, pressure, flow and so on factors, such as the weld lines designed to produce without obvious location, or will the weld lines designed to produce in not affect the mechanical properties of the products.
In addition to can make the surface of the ugly, they also can obviously reduce the mechanical properties of the affected areas, especially the impact strength (see figure 4 and figure 5).
This will obviously reduce the mechanical properties of components in this (see figure 7).

This study examines how the build orientation affects the mechanical and fatigue properties of Laser Powder Bed Fusion (PBF-LB) produced Ti6Al4V, without heat treatment.
It examines critical factors, such as yield strength, ultimate tensile strength, elongation at break, impact toughness, and flexural bending fatigue performance.
Mechanical Properties of the Ti6Al4V.
Mechanical properties of ti6al4v fabricated by laser powder bed fusion: A review focused on the processing and microstructural parameters influence on the final properties.
Mechanical properties of titanium-based ti– 6al–4v alloys manufactured by powder bed additive manufacture.

Physical and mechanical properties such as density and hardness are studied.
Hence for the determination of crystallite size all these factors have to be included.
This indicates that the increase in hardness is due to grain refinment and ECAP consolidation does not affect the grain refinment obtained due to mechanical alloying.
Combination of suitable flash annealing with ECAP or varying the back pressure will definitely fetch a 100% dense product without much affecting the properties obtained due to severe straining.
Densification and properties are almost same in the compacts processed in Route A and Route BC.

Mechanical properties of different PA-12 based materials.
Table 1 presents the mechanical properties of all injection-moulded specimens.
The studies will then continue with perfecting the current formulae regarding the materials’ mechanical properties and the materials’ FDM printability.
Interaction of Thermoplastic Polyurethane With Polyamide 1212 and Its Influence on the Thermal and Mechanical Properties of TPU/PA1212 Blends.
Relationship between structure and mechanical properties for aramid fibre.

The low thermal conductivity and the high chemical activity of titanium alloys lead, in fact, to alterations of the surface properties of the machined zone.
In this way, it is possible to obtain complex structures, reducing the overall costs because the effectiveness of a thermal process, that depends on the thermal properties rather than the mechanical properties of the material to be machined.
However, laser cutting of titanium alloy leads to alteration of the surface properties of the machined zone.
The resultant modified material due to the enrichment of these elements, shows much brittleness which will directly influence the mechanical properties and reduce the corrosion resistance of titanium alloys.
The experimental activity was carried out by the use of 2k factorial design with k=2 factors.