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But when the pipeline is welded, the high temperature of welding arc will do harm to the bonding strength of the enamel coating and the base metal because of the differences of thermo-physical properties between them.
When the pipeline with enamel coatings is welded, the high temperature of welding arc will do harm to the bonding strength of the enamel coating and the base metal because of the differences of thermo-physical properties between them.
Thermal Simulation Test The heat affected zone can be divided into some subzones according to different welding thermal cycle, such as fusion zone, overheated zone, normalized zone and imperfect normalized zone [21], and there is much difference among them in properties.
The remelting enamel coating could flow influenced by some factors, but it was restricted by the unmelted coating, some area subsided and some area bulged, so cracks and other flaws could be produced easily superadded residual stress in the enamel coating (Fig.4d).
[21] Zhang Wenyue: Welding metallurgy (Mechanical industry publishing company, Beijing 1993)

The affect of casing eccentricity on stress at the cement ring interface was analyzed.
Analyzing the material mechanical properties of consolidation components, it can be found that the cement ring ontology ultimate strength and deformation ability is far lower than the casing, under the same load conditions, the strain response vary widely, cement ring, casing and the strata rock cementation interface tensile ability will directly affect the sealing reliability of concretion body.
The finite Element Mechanics Model of Combination under the Interface Cementing According to the principle of elastic mechanics and finite element theory can establish corresponding any deep well casing-cement ring-strata rock consolidation plane strain mechanical model.
Article takes into consideration the cement ring interface cementing strength on consolidation stress and strain, the influence of the interface cementation mechanics relation can be described as: (6) σ is the normal contact stress (tensile); kn is the interface normal contact stiffness, be determined by the initial load phase’s slope of linear elastic section; u is the interface contact gap; dn is interface separation factor.
Conclusions 1.Setting up casing-cement ring-strata rock consolidation finite element analysis model which consider the cementing interface contact properties, under different working conditions, influence of casing eccentricity on cement ring interface load is analyzed. 2.Eccentricity influence laws on interfacial contact pressure are bound up with the value of casing pressure and the in-situ stress.

,Chengdu, Sichuan ,611731 , China 2PanGang Group Xichang Steel & Vanadium Co., Ltd., Xichang, Sichuan ,615041, China awangminli00@163.com, bzhiwangzheng@126.com, cxiaolipzh@163.com Keywords: high strength IF steel, coiling temperature, cold reduction ratio, Nb microalloying, microstructure, mechanical properties Abstract: Nb microalloying added phosphorus high strength IF steel was used to study the effect of coiling temperature and cold reduction ratio on the microstructures and mechanical properties.
Mechanical properties test The tensile samples were prepared for 0°, 45°, 90° three different directions from the annealed testing steels according to the standard of GB/T228-2002.
Therefore, to improve the mechanical properties of high strength IF steel, take the control of the coiling temperature is very key.
The cold reduction ratio is also the key affect factor of cold rolling, final performance in the appropriate composition and hot rolling process only guarantee and cold reduction ratio after the best match next rate, can obtain the high r value.
The feedback from the customers illustrate that the mechanical properties, surface qualities and deep draw performances are suitable for the requirement of complicated deformation.

Introduction Duplex stainless steels (DSSs) consisting of a dual structure of austenite + ferrite possess the superior mechanical and corrosion properties, and have been applied to various industrial fields such as petrochemical, power and seawater desalination plants.
Furthermore, numerical simulation of solidification cracking susceptibility was conducted in order to clarify the affecting factors of solidification cracking. 2.
Furthermore, numerical simulation of solidification cracking susceptibility was conducted in order to clarify the affecting factors of solidification cracking.
(3) In order to clarify the affecting factors of solidification cracking, numerical simulation of solidification cracking susceptibility was carried out.
[3] N.A.McPherson, Y.Li and T.N.Baker: "Microstructure and Properties of As Welded Duplex Stainless Steel", Sci. & Technol.

Such degradation is influenced by the response of coatings to environmental factors such as high temperatures and exposure to ultraviolet radiation, as well as chemical factors.
Coating life in the region of these displacement concentrations is likely to be affected by the local strain effects, and the structural loading history may therefore be a factor which needs to be considered in predicting and assessing rates of coating degradation.
Coating Failure Environment Most coating failure studies focus on two critical experimental factors, namely (i) ultraviolet (UV) radiation exposure and (ii) the combined function of heat and moisture (the hydrothermal effect) [4].
In general, both effects cause a series of chain chemical reactions in the polyurethane topcoat, leading inevitably to deterioration in coating mechanical properties; the process can be accelerated by the presence of water and elevated temperature.
The deterioration of a polyurethane topcoat can be measured through its effect on coating appearance and coating mechanical properties (i.e. tensile strength, elongation, impact strength and elastic modulus).

,Ltd of CTCE Group,Hefei 230023 ,China 2School of Mechanical and Materials Engineering, Jiujiang University, Jiujiang 332005 a fj9699@126.com, bliyonhi168@163.com Keywords: Clad bridge plates; Orthotropic; Stainless Steel ;Welding process; Optimization.
Abstract: Clad plates welding of stainless steel welding on interlayer between grass roots and the transition layer is a key technology.Structure and properties of welded joints is very uneven,and there have often welding repair cracks.
The form of V-type and CO2 welding gas arc welding process are used.There have a larger gap ,large welding field strength and too slow to affectting the duration because of the site group.
Weld of clad bridge plates Process Optimization of Welding Preliminary studies have shown that there have many factors affecting welding quality of composite bridge plates and this is a very necessary to welding quality assurance.
Improve the quality of manufacturing cells 1) The cutting material need specification, and heat treatment must be completed,;there need subsequent heat treatment if necessary and control the accuracy of production unit. 2) There has a right cutting-groove technology and subsequent heat treatment in order to eliminate stress and improve material properties. 3) Transportation, installation, assembly and other process specifications shall be developed , and it will eliminate roughness, control gap and reduce the stress concentration. 4) The design innovation riveting bolts。

Additionally, the microstructure of the solid phase related to neck growth and solid phase continuity strongly affects the mechanical properties [2-3].
Unfortunately, reports on the processing and mechanical properties of boride are very limited.
Mechanical properties and mechanisms.
This indicated that high compaction pressures improve the mechanical properties of porous TiB2 ceramics.
The high mechanical properties are related to the growth of the neck growth by surface diffusion in high temperature.

There are many rockburst factors, and by the mining process and mining, its leading factor was difficult to be determined during mining.
Energy theory, when the orebody-wall rock system Mechanical equilibrium has been broke, the releasing energy was greater than the consumed energy, the rockburst happed.
Impact tendentiousness theory, The theory holds that the rockburst was not only related to external conditions, but also was related to the physical properties of the coal and rock.
Three - factor theory, The theory is that rockburst occurred coal strata force the stick-slip process at the moment, It is a releasing kinetic energy process that coal seam and rock seam glided suddenly, Which concluded the three-factors mechanistic model[3,4].
Affected by the coal seam dip, Stress concentration area along the seam tilt direction was 10 meter to 30 meter because stable supporting strip was formed by mined above stage.

There are techniques for determining which factors are active.
Table 2 Factors and their levels for the experiments Factors Level - Level + A.
All two effects are positive, if considered only these main effects, we would run all two factors at the high level to minimized Ra and maximized MRR.
Chakrabarti, “Conducting carbon black filled EPDM vulcanizates: assessment of dependence of physical and mechanical properties and conducting character on variation of filler loading”, European Polymer Journal, No. 36, 2000, pp. 1043-1054 [3] Y.
Hikichi, “Electrical and elastic properties of conductor-polymer composites”, Journal of Materials science, No. 34, 1999, pp. 2979-2985

Mechanical properties of the welded joints made from different kinds of binder have been determined.
A contact of those materials with air or other corrosive factors causes deterioration of their strength properties and as a result material degradation.
Each type of welding process results in a decrease (approx. 30¸60%) in mechanical properties of welded material.
In the process of welding, the mechanical properties of those alloys in the heat-affected-zone (HAZ) are reduced to the level of the soft material.
This insulating layer of oxide must have the appropriate mechanical and physical properties.