The Experts below are selected from a list of 15 Experts worldwide ranked by ideXlab platform

Mehmet Tufan - One of the best experts on this subject based on the ideXlab platform.

Ghodratollah Roudini - One of the best experts on this subject based on the ideXlab platform.

  • Effects of Ti addition on the microstructure and mechanical properties of multi-pass E6010 high-Cellulosic Electrode weld metal
    Applied Physics A, 2018
    Co-Authors: Ramin Ahmadikhah, Mahmood Sharifitabar, Ghodratollah Roudini
    Abstract:

    The aim of the present research was investigating the effects of Ti addition on the microstructure and mechanical properties of the E6010 high Cellulosic Electrode weld metal. Different concentrations of ferrotitanium were added to the Electrode coating. Then, the effects of recovered Ti on the microstructure, tensile strength, hardness and impact strength of the weld metal were explored. Results showed that the recovery percent of Ti was below 10%. However, the Ti added to the melt altered the microstructural constituents and different ferrite morphologies including acicular ferrite, Widmanstätten ferrite, polygonal ferrite, and ferrite with secondary phase aligned along with the bainitic microstructure were developed at various Ti concentrations. Also, the addition of Ti improved hardness, tensile strength and yield strength while it deteriorated elongation and impact strength of the weld deposit. Finally, it was postulated that the Ti concentration in the weld metal should be lower than 0.065 wt% to achieve a deposit satisfying AWS A5.1 standard requirements.

Cem S Cetinarslan - One of the best experts on this subject based on the ideXlab platform.

M Johnson - One of the best experts on this subject based on the ideXlab platform.

  • effect of welding parameters and Electrode condition on alloying enrichment of weld metal deposited with coated Cellulosic Electrodes
    Welding Journal, 2010
    Co-Authors: J E Ramirez, M Johnson
    Abstract:

    Manual weiding with Cellulosic Electrodes is widely used. However, unexpectedly high weld metal alloy contents have been associated with weld metal hydrogen-assisted cracking. Lot-to-lot consumable variation may not always be the primary factor responsible for unexpected cases of highly alloyed weld metals. Therefore, the effect of welding parameters (arc length, welding current, and weld length) and conditions of the Cellulosic Electrode (as-received and dried) on alloying enrichment of deposited weld metals were evaluated. Arc length, weld length, and "dried" condition of the Electrode have a primary effect on the chemical composition of deposited weld metals. Welding current has a secondary effect. Decreasing the arc length resulted in an increase of carbon level in the weld metal. A large increase in manganese and silicon in the weld metal resulted with increasing distance from the weld start point or the use of Cellulosic Electrodes in the "dried" condition. Alloying enrichment of the weld metals, as indicated by the carbon level and carbon equivalent, results in an increase in susceptibility of the weld metal to cracking.

Eslam Ranjbarnodeh - One of the best experts on this subject based on the ideXlab platform.

  • The Effect of Hydrogen Content and Welding Conditions on the Hydrogen Induced Cracking of the API X70 Steel Weld
    International Journal of Hydrogen Energy, 2018
    Co-Authors: Ali Talebi Hanzaei, S. P. H. Marashi, Eslam Ranjbarnodeh
    Abstract:

    Abstract The self-restraint testing was used to investigate the influence of hydrogen content, preheating, and post-heating on the sensitivity of welding of API X70 pipeline steel to hydrogen induced cracking (HIC). The variation of hydrogen content was applied using a low hydrogen Electrode E8018-G and a high hydrogen (Cellulosic) Electrode E8010-P1. Diffusible hydrogen of these Electrodes was measured by mercury displacement method. The average diffusible hydrogen content of Cellulosic Electrode E8010-P1 and low hydrogen Electrode E8018-G were 43.6 and 1.1 ml/100 g of weld metal, respectively. The results of visual inspection, penetrant test, and macroscopic examination showed that welding with Cellulosic Electrode leads to cracking unless both preheating and post-heating are applied. However, in the case of low hydrogen Electrode, cracking occurs only if no preheating or post-heating is applied. The microstructure of the welded specimens in different conditions by optical and scanning electron microscopy (SEM) showed that the dominant phase in the weld zone of all specimens is bainite. The microhardness profile displayed that hardness limitation (350 HV) cannot predict the sensitivity to cold cracking; therefore, other parameters such as hydrogen content should also be considered.