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2 edition of An assessment of weld heterogenetics in PMMA using birefringence found in the catalog.

An assessment of weld heterogenetics in PMMA using birefringence

R. J. Wise

An assessment of weld heterogenetics in PMMA using birefringence

by R. J. Wise

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  • 16 Currently reading

Published by TWI in Cambridge .
Written in English


Edition Notes

Statementby R J Wise and S D Smith.
Series686/1999
ContributionsSmith, S. D., Welding Institute.
ID Numbers
Open LibraryOL18397754M

Crosslinking PMMA: Molecular Dynamics Investigation of the Shear Response Kyoungmin Min,1,2 Meredith Silberstein,2 N. R. Aluru1,2 1Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, N. Mathews Avenue, Urbana, Illinois 2Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, N. Mathews . gas to protect the molten weld pool. The application of GMAW generally requires DC+ (reverse) polarity to the electrode. In non-standard terminology, GMAW is commonly known as MIG (Metal Inert Gas) welding and it is less commonly known as MAG (Metal Active Gas) welding.

mm-thick material was modeled using mm face diameter electrodes, for a weld time of 10 cycles. The mm-thick material was modeled using mm electrodes, for a weld time of 14 cycles.) A B Fig. 2 — A — Weld nugget cross section; B — related hardness pro-file for an untempered resistance spot weld on MPa (ksi) material.   In the current study, Back Weld group has maximum exposure to cadmium (± mg/m 3), however, it is lower than findings of previous study. Therefore, it seems that the potential probability of neurologic effects due to cadmium exposure could be negligible in welders of Gas Transmission Pipelines.

pipe, in which the weld is made in the flat welding position by rotating the pipe about its axis. See fig-ure below: 1G, plate. A welding test position designation for a linear groove weld applied to a joint, in which the weld is made in the flat welding position. See figure below: 2F, pipe. A welding test position designation for a. 2. Click Baseline to calibrate the tool using the SiO 2 and Si standards. 3. Mount wafer and select the PMMA on Si recipe. 4. Edit the recipe so that 85 points are measured on the wafer with a 1 cm edge exclusion. 5. Click Start to measure the resist thickness of each wafer. Results: Spin Speed [RPM] Thickness [nm] PMMA A4 PMMA A2


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An assessment of weld heterogenetics in PMMA using birefringence by R. J. Wise Download PDF EPUB FB2

An assessment of weld heterogeneities in PMMA using birefringence [pdf / MB] Member report TWI Industrial Member Report Summary / R J Wise and S D Smith.

The reptation time for PMMA, PC, and PBT were investigated to analyze the establishment of the weld strength. When the reptation time is much shorter than time in molten state, the higher weld strength is feasible. It can be concluded that the weld strength of PC/PBT was higher than the weld strength of PMMA/ by: 2.

applications, while PMMA is much cheaper and has absolute values of the stress optical coefficient twice as high as COP ( Brewster vs. Brewster for COP), the birefringence for PMMA is one third of the COP. The difference is probably caused by better molding properties of PMMA. This effect was captured in the simulation results by: 1.

Tensile tests were conducted on PMMA samples that were both in the as-received condition, and also aged in air or oil for up to 8 weeks. Both welded and unwelded samples were examined.

Fracture of the joints was studied using notched tensile specimens and Brazilian disk tests. Results showed that aging had no effect on tensile properties.

In the online birefringence system, whose details were reported previously (H. Venkatesvaran and M. Cakmak, SPE ANTEC Tech Pap39, ; H. Venkatesvaran and M. Cakmak, Polym Eng Sci41, ), a green and red laser is passed through the films being annealed in a heat‐setting chamber; the resulting data are analyzed for the details.

Distributed phase birefringence measurements based on polarization correlation in phase-sensitive optical time-domain reflectometers Marcelo A.

Soto,1,* Xin Lu,1 Hugo F. Martins,2 Miguel Gonzalez-Herraez,3 and Luc Thévenaz1 1EPFL Swiss Federal Institute of Technology, Institute of Electrical Engineer ing, SCI STI LT, Stat CH Lausanne, Switzerland. The residual birefringence in quenched and injection-molded specimens of bisphenol-A polycarbonate (BAPC) homopolymer and its copolymers with substituted bisphenol-A is investigated.

Detailed analysis using statistical methods like factorial techniques have been employed by researchers to correlate these parameters with weld bead geometry, weld quality, etc []. Purohit [8] has determined bead geometry parameters for metal inert gas (MIG) underwater welded bead-on-plates using 2-level factorial design of experiments.

MT Life Assessment of Welded Structures 3 0 0 3 MT Process Modeling 3 0 0 3 Assessment of fractography. Text Books 1. Avner, S. H., “Introduction to Physical Metallurgy”, second edition, McGraw Hill, 2.

William F. Hosford, Physical Metallurgy, Taylor & Francis Group, Weld joints, weld symbols, and joint design. welding process at a manufacturing plant and proposes to use Operational Six Sigma technique to eliminate the problem.

In contrast to other method which measure and identify the nonconformance through destructive testing, a technique is proposed to use a mathematical model, which is later charted using SPC technique.

Here we demonstrate, for the first time, that it is possible to synthesize a polymer that exhibits no orientational birefringence and no photoelastic birefringence using two methods.

In these methods, the contributions of monomers and an anisotropic dopant to orientational birefringence and photoelastic birefringence are analyzed experimentally, after which the composition of a ternary.

An Assessment of Weld Heterogeneities in PMMA Using Birefringence. R.J. Wise, R. Thomas, May This paper concentrates on the measurement of melt orientation of polymer chains and welding residual stress using birefringence.

PMMA specimens were welded using four techniques, hot plate welding, laser welding, hot gas welding and ultrasonic. PMMA which is a transparent thermoplastic material [] and 8 has an appropriate mechanical and chemical characteristics for microdevices [].

As an exemplification, capillary driven flow 9 occurs in PMMA because of the hydrophilic characteristic of this material [, ] which makes it a popular one to use in microfluidic devices. Figure 6.

Center of weld metal “in the weld fusion zone”. Figure 7. XRD spectrum of welded low carbon steel in all the welded zone (Weld metal + HAZ). and bcc (), we conclude a presence only of ferrite phase observed by optical microscopy. On the other hand, by using EBSD observation (Fig-ure 8) a fusion line is determined.

We can. Developing versatile joining techniques to weld transparent materials on a micrometer scale is of great importance in a growing number of applications, especially for the fabrication and assembly of biomedical devices.

In this paper, we report on fs-laser microwelding of two transparent layers of polymethyl methacrylate (PMMA) based on nonlinear absorption and localized heat accumulation at. PS, PMMA and their blends were dried at 80 °C for 4 h prior to injection molding.

All samples were prepared on a Nissel fully hydraulic 68 tons injection molding machine having a maximum injection capacity of cm 3 /shot. The molded contained two ASTM standard dogbone-shaped cavities for mechanical testing for both welded and non-welded specimens in this study is shown in Fig.

A model was developed to predict root defects when using laser and hybrid-laser processes. by J. Blecher et al. Published 03/; Carburization Phenomenon of ENiCrFe-7 Nickel-Based Alloy Covered Electrode A search is made to find the factors that influence carbon transfer from the flux of covered electrodes into the weld metal.

by R. Qin. I saw some paper use this method. They spin coating PMMA onto MoS2 and then separate PMMA/MoS2 using NaOH. Then apply the PMMA/MoS2 onto new substrate and then dissolve PMMA.

In this study a technique allowing for quantitative assessment of birefringence was calibrated for universal use in mineralized tissues. We believe this is a promising attempt for quantification of collagen fiber arrangement in cortical bone, which is a curtail parameter in many models and can improve our general understanding of the principles.

The Weld Joints 3. Physics of Welding 4. Features of a Fusion Welded Joint Joining - welding, brazing, soldering, and adhesive bonding to form a permanent joint between parts Assembly - mechanical methods (usually) of fastening parts together Some of these methods allow for easy disassembly.

2. Birefringence in polycarbonate set square showing gate at P and weld line at WW. Plastic models of any product can be used to simulate ‘in-service’ conditions. Both applied and residual stress fields can be exposed using models of structures in photosensitive material placed between polarizing filters in the crossed polar position.was used in this study to join the plates, using an inert gas to protect the fusion well.

This process has been characterized in the market as MIG (metal inert gas). To analyze this process under the impact test, six specimens (Figure 1) were manufactured with a 6 mm hole diameter and 6 specimens with a 8 mm hole diameter to fill the weld.

The arc melts the end of the electrode wire, which is transferred to the molten weld pool. For a given wire material and diameter, the arc current is determined by the wire feed rate.

The arc and the weld pool is shielded from the atmospheric contamination by an externally supplied shield gas. Metal Inert Gas (MIG) welding is a 'flat' arc.