Conditions Of Brittle Strength Of Weld Joints At Different Temperatures And Applied Loading Rates

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Polyethylene Pipeline Systems - Avoiding The Pitfalls of

engineered bimodal PE100 now provides exceptional balance of strength, stiffness, toughness and durability consistent with demands of long-term gas and water pressure containment, ground loading and the service environment 2


Design weld joints for strength and rigidity under static loading conditions. Design weld joints for dynamic loading and high temperature applications. Analyze and predict the life of weld joints subjected to fatigue and evaluate the effect of stress concentration on fatigue life of such joints.


Three testing methods of different loading rates had been applied using notched specimens (impact pendulum, drop weight, explosion bulging) for toughness and ductility assessment of metal manual arc welded joints. Basic properties of welded joints and transition temperatures were assessed too, as a part of weldability testing.

Mechanical and material characterization of high strength

Additionally, it is assessed the variation on hardness and Yield strength along the weld zone and heat affected zone and it is studied the influence of 4 different sets of welding parameters on those properties. It is found that the increase in the heat input has as consequence an overall reduction of hardness and yield strength.


pre-cracked in weld metal [2] The dominant almost linear middle part of curve in Figs. 2-4 is covered by Paris law and is practically most important, since it allows to define the difference between fatigue crack low growth rates (initiation) close to fatigue threshold, and high rates (KIc), when fracture occurs. The application of

Mechanical Properties of High Temperature Materials: A Review

2018). The gTAW joints presented lower tensile strength than the parent metal and the failure show in the weld metal region for all test temperatures. Constant load Stress Corrosion Cracking (SCC) test data of the gTAW weld joints tested in boiling MgCl2 environment at different applied stress level are presented. SCC curves obtained

Effects of Thermal Aging and Absorbed Hydrogen on Fatigue

These conditions could result in ailuref of pressure vessels and pressure piping related accidents are often fatal and that involved loss of capital investment [3]-[4]. As most of the problems in heavy-section piping occur at welded joints therefore damage assessment techniques should focus on these regions rather than the base metal alone [5-6].

Review on Formability of Tailor-Welded Blanks

width of a mash seam weld including the Heat Affected Zone is 10-15 mm while the width of a laser weld including the Heat Affected Zone is 1-2 mm. The volume fraction of martensite in the laser weld is large due to the high temperature rates during the cooling of the laser weld. Due to the lower temperature rates in

Structural Steel Welding

Weld profile: The profile of a finished weld may have a considerable effect on the performance under dynamic loading conditions. Overlap, excessive reinforcement or mismatch can provide stress concentration points where fatigue cracks can initiate. Typical unacceptable butt and fillet weld profiles are shown below along with an example of poor

Assessment of Defects: The c.o.d. Approach [and Discussion]

(c) various material toughnesses and strengths in different parts of welded joints; (d) the thickness of materials of interest is often such that valid plane strain l.e.f.m. fracture toughness measurements cannot be made at the temperature and loading rate of interest in the


weld metal. To further reduce susceptibility to IGSCC, a Hydrogen Water Chemistry System was placed in operation in 1988. The NRC s evaluation of NSP s response to Generic Letter 88-01 concluded that the IGSCC inspection and mitigation program provides reasonable assurance of maintaining


That is why, in the case of austenitic weld metal as well, the content of hydrogen should be taken into consideration when calculating the preheating temperature.According to the data from literature [2], the input in the weld metal can be up to 5 ml of hydrogen/100 g of weld metal in case of MIG/MAGweldingprocesswithsolidwire.

2020 The Thermomechanical Finite Element Analysis of

yield and ultimate tensile strength of the welded joints. The mechanical properties and metallurgical changes for 6061-T6 aluminum alloy welds were reported initially by V. Malin (Ref 2). This author used hardness measurements and analytical weld thermal cycles to evidence a soft zone formation in the HAZ.


been performed for the above under-matched weld joint by using various strain rates and test temperatures. The effects of the relative thickness of the under-matched joints on yield stress and tensile strength are shown in Figure 5. The effect of relative thickness on the tensile strength of under-matched joints is the same as in our

Table of Contents

and End-notched Flexure (ENF) tests under static loading, respectively. Results show that curing conditions affect interlayer microstructures and the morphology of toughening particles. However, the initiation and propagation GIc and GIIc are not sensitive to the applied higher heating rates and curing temperatures.

Olafsson, Dagur; Santos Vilaca da Silva, Pedro; Vesanko

test enables to monitor the force relaxation of a pre-loaded bolt joint, under cyclic thermal loading, simulating real operational conditions. The test was applied to both Al base material and Cu base material components. The experimental results show that the force relaxation in the Cu bolted joint was about 50% lower compared with the Al.


Brittleness Although in general the strength of metals tends to increase with decreasing temperature, at temperatures around -20°C some metals begin to lose their toughness (resistance to fracture) and ductility. Many steels, for example, begin to manifest brittle behavior, and their flexibility is much reduced. This temperature is known as the

Resistance microwelding of crossed Pt 10Ir and 316 LVM

6 a top and b bottom of weld made with 5 kgf electrode force and 200 A welding current and c top and d bottom of weld made with 5 kgf electrode force and 400 A welding current 7 Low and high magnification SEM cross- sectional images of joints welded with e lectrode force of 5 kgf and current of a, b 300 A and c, d 400 A, showing formation of notch


loading, pp 581-587 Issue 9; Sep-2001 X.Y.Li et al, Finite element analysis of the effect of weld geometry and load condition on fatigue strength of lap joint, pp 591-597 Y.Xinqi et al, Influences of some materials on J-estimation methods for pipes with circumferential surface cracks, pp 599-605

A Review on Design and Analysis of Adhesive Bonded Joint by

joints is reviewed in this paper, in terms of static loading analysis, fatigue loading analysis and dynamic characteristics of the adhesively bonded joints. In this work fabrication Heatof joint using Ms flat plate will be done. The joint will be made by welding, riveting and adhesive bonding process.

A Survey of High Temperature Alloy Selection in Heat Treating

strength, but seldom is strength alone the only factor to consider. Rough handling (such as pounding on or tossing/drop-ping cast grids or fi xturing) may result in failure due to the brittle nature of the casting rather than from thermal fatigue brought about from stress rupture or creep. Wrought-alloy baskets are not nec-

Design against Brittle Fracture - JSTOR Home

pletely that fracture initiation will not occur from a brittle area of a weld. Thus a base metal with sufficient toughness to arrest a crack emerging from such a region is required. A third option is applied to 'high risk' structures, especially where the stored energy is high, as en-countered in natural gas pipelines.


While most structural steels become more brittle at very low Low-temperature temperatures and may fail catastrophically under circumstances welding that would pose no problem under normal conditions, some studiL' indicate that 95% of material failures in structures occur at or near welded joints (e.g. Gowda 1988).

SIAC-PUB-468 August 1968 @CC >

improvement in wetting and overall bond strength. Because tin is the expensive component in the Pb-Sn solders (tin costs almost 10 times more than lead), spe- cial fluxes and pre-tinning with higher tin content solders assist in reducing the tin content, and cost, of the bulk solder alloy.

Soldering and brazing of copper and copper alloys

applied, and if the parts to be joined are designed so as to facilitate the soldering/ brazing process and to ensure that the soldered/brazed part is safe under the conditions in which it is to be used [1]. This booklet aims to reflect the current state of soldering and brazing copper and copper alloys in industrial applications, but

ap - DTIC

temperatures for different alloys are presented in annealed lo0 2 Table 1. The actual temperature and time should be lc 1 determined for each heat of base metal, base-mi tal filler-metal combination, base-metal condition, and Ti-6A1-4V, solu- 900 15 weld structure because they can vary with any or tion treated 1000 4

Cast Irons; Types, Properties, Applications & Weldability

conditions, cast iron pipes deteriorate at different rate. The problem can be further complicated by the diversity in production quality in both cast iron material and pipes and the wide range in the diameter and wall thickness of the pipes. However, it is also known that corrosion rates of buried pipes decrease over time. This is largely


strength. Its weldability of these steels is good, since the content of carbon (C < 0,12 %) and other alloy ele-ments. This allows lower preheating temperatures or even the complete omission of preheating as an addi-tional processing phase. Weld metal is an aggregate of base and filler material. However, current research has


joints with the welds of different alloying composi-tions. The joints with the B-M type welds have the highest values of impact toughness at the negative temperature. These values are much lower in the joints with the F-P and A-F type welds. A marked decrease in the impact toughness values of the HAZ metal of such joints begins already at Ttest

Investigation of mechanical properties and hot corrosion

at high temperatures, aggravated by the fluxing of fused salt on the metal surfaces. The need of hot corrosion has aroused as during welding dissimilar materials, different cooling rates were observed [9] and these led to the for-mation of corrosive layer at the interface with the passage of time and the joint gets failed. It has been

Marley Polyethylene Systems

the pipe will not fail in a brittle manner from Rapid Crack Propogation (RCP). The method identifies a Minimum Required Strength (MRS) value derived from the 50 year extrapolated 97.5% lower confidence limit (LCL) failure stress. A safety factor is applied to the MRS to determine the design stress permissable safety factor.

Template IOP for WTK 2021

May 25, 2021 weld metal [14]. Both aspects lead to an irreversible elongation even if there is just a load applied to the component which is normally in the elastic range for shape memory alloys [20]. Nevertheless, laser welding is well suited to produce high strength joints of NiTi shape memory alloys when considering