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You searched on: Author: thomas siewert

Displaying records 51 to 60 of 74 records.
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51. Reliability Improvements in Repair Welding of High Strength Steels
Published: 7/1/2002
Authors: Ivan Samardzic, Thomas Allen Siewert
Abstract: Engineers often have to deal with repair of weldments after they have been put into service. Here, the concern is that the service environment may have changed the structure, indepent of whether the problems originated during the initial constructio ...

52. Statistical Evaluation of a Round-Robin Experiment: Uncertainies in Ferrite Measurement in Weldments
Published: 7/1/2002
Authors: Thomas Allen Siewert, J C Farrar, Z Zhang
Abstract: A Round Robin was organized to measure ferrite (FN) levels in the weld metal of five stainless steel weldments, including: types AISI 308H (with controlled ferrite), 2205 (22% Cr duplex), 309 Mo, 16-8-2 (316H - a lean composition with controlled ferr ...

53. Observations on Differences Between the Energy Determined Using an Instrumented Striker and Dial/Encoder Energy
Published: 6/1/2002
Authors: M P Manahan, R B Stonesifer, Thomas Allen Siewert, Christopher N McCowan, D P Vigliotti
Abstract: Instrumented stricker systems and optical encoders are widely used for measurement of absorbed energy in both conventional and miniature Charpy tests. It has been observed that the total absorbed energy measured using these two technologies, while g ...

54. The History and Importance of Impact Testing
Published: 5/1/2002
Authors: Thomas Allen Siewert, M P Manahan, Christopher N McCowan, J M Holt, F J Marsh
Abstract: Charpy impact testing is a low-cost and reliable test method which is commonly required by the construction codes for fracture-critical structures such as bridges and pressure vessels. yet, it took from about 1900 to 1960 for impact-test technology ...

55. Database for Solder Properties With Emphasis on New Lead-Free Solders
Published: 1/1/2002
Authors: David R. Smith, Thomas Allen Siewert, L Stephen, Juan C Madeni
Abstract: Legal and environmental considerations require that the electronics industries cease using solders containing lead. This database provides properties of lead-free solders that may be used to replace the solders containing lead that are currently in ...

56. Eleventh International Conference on Computer Technology in Welding
Series: Special Publication (NIST SP)
Report Number: 973
Published: 1/1/2002
Authors: Thomas Allen Siewert, C Pollock
Abstract: These are proceedings of the eleventh conference in this series. The conference was held December 5 and 6, 2001, in Columbus, Ohio, under the sponsorship of the American Welding Society, NIST, and The proceedings include 32 presentations grouped int ...

57. Historical Background and Development of the Charpy Test
Published: 1/1/2002
Authors: L Toth, H P Rossmanith, Thomas Allen Siewert
Abstract: The impact test method based on a pendulum, generally called the Charpy test, is one of the more cost-effective material testing procedures, both with respect to acceptance of products and to surveillance. This contribution attempts to present a br ...

58. Contact Tube Temperature During GMAW
Published: 12/1/2001
Authors: G Adam, Thomas Allen Siewert, Timothy P Quinn, D P Vigliotti
Abstract: The rate of heating and the maximum temperature reached by the contact tube during gas metal arc welding (GMAW) is quantified. We studied the effect of changes in the contact-tube-to-work distance (CTWD), voltage, welding wire feed speed, gas flow r ...

59. Estimation of Process Stability in the MAG Welding Process by Monitoring the Welding Parameters
Published: 11/1/2001
Author: Thomas Allen Siewert
Abstract: This paper presents the distribution of the main welding parameters (welding voltage and welding current) for semiautomatic arc welding with the metal active gas (MAG) process, using both flux- cored and solid electrodes. Two different shielding fas ...

60. MSEL 2001 Programs and Accomplishments: Materials Reliability Division
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 6795
Published: 9/1/2001
Authors: F R. Fickett, Thomas Allen Siewert
Abstract: The materials Reliability Division's mission is to develop and disseminate measurement methods and standards enhancing the quality and reliability of materials and to provide technical leadership in their introduction to appropriate industries. Our ...

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  • SP 250-XX: Calibration Services
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