scispace - formally typeset
Search or ask a question
Journal ArticleDOI

Experimental Determination of Cooling Rate and its Effect on Microhardness in Submerged Arc Welding of Mild Steel Plate (Grade c-25 as per IS 1570)

08 Aug 2014-Journal of Material Sciences & Engineering (OMICS International)-Vol. 3, Iss: 2, pp 1-4
TL;DR: In this paper, an experiment based thermal analysis has been performed to obtain the thermal histories, which can be applied to determine cooling rate of weldment, and the effect of selected welding parameters (Wire feed rate, Open circuit Voltage and welding Speed) on the microhardness have been investigated.
Abstract: An experiment based thermal analysis has been performed to obtain the thermal histories, which can be applied to determine cooling rate of weldment. During fusion welding process it is possible to determine temperature at any point by using thermocouple and from such data it is possible to draw thermal histories for any point of interest, such thermal histories can be utilized to determine cooling rate. The temperature distribution and cooling rate during the welding process have significant effect on the mechanical and metallurgical properties of a weldment. The changes in microstructure, grain growth and hardness in a weldment are very dependent on the temperature distribution and cooling rate. These studies are utilized to investigate the micro-structure and microhardness of the heat affected zone (HAZ) and weldment. In present work, the influence of heat input and cooling rate on microhardness has been investigated. Full factorial design is used to conduct the experiment with three factors and two levels. Eight combinations and two set of heat input are designed with different combinations of SAW welding parameters. Temperature distribution curves and cooling rate have been drawn. The effect of selected welding parameters (Wire feed rate, Open circuit Voltage and welding Speed) on the microhardness have been investigated.

Content maybe subject to copyright    Report

Citations
More filters
Journal Article
TL;DR: This book by a teacher of statistics (as well as a consultant for "experimenters") is a comprehensive study of the philosophical background for the statistical design of experiment.
Abstract: THE DESIGN AND ANALYSIS OF EXPERIMENTS. By Oscar Kempthorne. New York, John Wiley and Sons, Inc., 1952. 631 pp. $8.50. This book by a teacher of statistics (as well as a consultant for \"experimenters\") is a comprehensive study of the philosophical background for the statistical design of experiment. It is necessary to have some facility with algebraic notation and manipulation to be able to use the volume intelligently. The problems are presented from the theoretical point of view, without such practical examples as would be helpful for those not acquainted with mathematics. The mathematical justification for the techniques is given. As a somewhat advanced treatment of the design and analysis of experiments, this volume will be interesting and helpful for many who approach statistics theoretically as well as practically. With emphasis on the \"why,\" and with description given broadly, the author relates the subject matter to the general theory of statistics and to the general problem of experimental inference. MARGARET J. ROBERTSON

13,333 citations

Book
01 Jan 1989

38 citations

Journal ArticleDOI
TL;DR: In this article, cooling rates have been predicted during electron beam welding of AISI 304 stainless steel for different values of energy input per unit length using physics-based phenomenological model and commercial finite element analysis.
Abstract: Cooling rate of the weld during solidification has significant influence on metallurgical and mechanical properties of welded joint. In the present study, cooling rates have been predicted during electron beam welding of AISI 304 stainless steel for different values of energy input per unit length using physics-based phenomenological model and commercial finite element analysis. Cooling rates predicted by the above models have been validated with the experimental cooling rate estimated indirectly from the secondary dendritic arm spacing (SDAS) obtained in the microstructure of the welded sample. The predicted cooling rate is observed to vary inversely with the energy input per unit length, as expected. It has also been correlated with the grain characteristics like grain size and grain boundary character distribution (GBCD) obtained by EBSD analysis of the weld metal. An increase in low-angle boundary has been observed with the increase in cooling rate, which has been attributed to an increase in dislocation density.

26 citations

Journal ArticleDOI
TL;DR: In this article, the authors defined the importance of the interpass temperature and cooling rate with t 8/5 in order to improve the mechanical properties of steel welds, and showed that the improvement of notch impact toughness at −20°C is 24.5% by stopping the welding machine after the internal welding, this value is 17.7% by shifting the external weld point from internal welding.

23 citations

Journal ArticleDOI
TL;DR: In this article, the weldability of carbon steel is determined by carbon equivalent (CE) for predicting/estimating preheat temperatures necessary for weld integrity of the weldment, based on the microstructure of a welded steel.
Abstract: The weldability of carbon steel is determined by carbon equivalent (CE) for predicting/estimating preheat temperatures necessary for weld integrity of the weldment. The microstructure of the welded...

17 citations


Cites background from "Experimental Determination of Cooli..."

  • ..., 2014), (c) Slow cooling rate, high heat input (Kumar et al., 2014)....

    [...]

  • ..., respectively, S is the welding speed mm/min, and K is the thermal efficiency for the welding process (Kumar et al., 2014; Liskevych & Scotti, 2015) From Figure 1, the heat affected zone of the weldment improved as the heat input of the welding process increases....

    [...]

  • ...(a) Fast cooling rate, low heat input (Kumar et al., 2014), (b) Medium cooling rate, medium heat input (Kumar et al....

    [...]

  • ..., 2014), (b) Medium cooling rate, medium heat input (Kumar et al., 2014), (c) Slow cooling rate, high heat input (Kumar et al....

    [...]

  • ...Calculated heat input and cooling rate (Kumar et al., 2014) Plate Current Voltage Speed HI in KJ/mm Cooling R ate....

    [...]

References
More filters
Journal Article
TL;DR: This book by a teacher of statistics (as well as a consultant for "experimenters") is a comprehensive study of the philosophical background for the statistical design of experiment.
Abstract: THE DESIGN AND ANALYSIS OF EXPERIMENTS. By Oscar Kempthorne. New York, John Wiley and Sons, Inc., 1952. 631 pp. $8.50. This book by a teacher of statistics (as well as a consultant for \"experimenters\") is a comprehensive study of the philosophical background for the statistical design of experiment. It is necessary to have some facility with algebraic notation and manipulation to be able to use the volume intelligently. The problems are presented from the theoretical point of view, without such practical examples as would be helpful for those not acquainted with mathematics. The mathematical justification for the techniques is given. As a somewhat advanced treatment of the design and analysis of experiments, this volume will be interesting and helpful for many who approach statistics theoretically as well as practically. With emphasis on the \"why,\" and with description given broadly, the author relates the subject matter to the general theory of statistics and to the general problem of experimental inference. MARGARET J. ROBERTSON

13,333 citations


"Experimental Determination of Cooli..." refers methods in this paper

  • ...These specimens were prepared by standard metallurgical polishing methods [9]....

    [...]

Journal ArticleDOI
TL;DR: In this paper, the effect of controllable process variables on the heat input and the area of the heat affected zone (HAZ) for bead-on-plate and beadon-joint welding were calculated and analyzed using mathematical models developed for the submerged arc welding of pipes.

129 citations


"Experimental Determination of Cooli..." refers background in this paper

  • ...Figure 6 shows the temperature history of weldment [10], welded at Low medium and high cooling rates....

    [...]

Journal ArticleDOI
TL;DR: In this article, the welding temperature distributions in the HAZ were measured using K-type thermocouples in similar and dissimilar thin butt-welded joints which experienced one-pass GTAW welding process.

104 citations

Book
01 Jan 2007

54 citations

Book
01 Jan 1989

38 citations