Comparative Study of H350R and E8016 Electrode in Surface Hard-Facing Welding of 100 pound/yard Railway by Shielded Metal Arc Welding

Authors

  • Arawan Chanpahol
  • Budsabakorn Kongruang

Keywords:

surface hardfacing welding, type of welding electrode, shielded metal arc welding

Abstract

This research was a comparative study of H350R and E8016 electrodes  in surface hardfacing welding of 100 pound/yard railway made from shielded metal arc welding. The penetrant testing to examine the surface found a 5 - 8 millimeter crack from welding with electrode H350R, but no crack or porosity from welding  with electrode E8016. From the macrostructure examination, there was no recognizable crack or porosity. The microstructure examination showed that welding with both electrodes produced pearlite structures. The crack width from welding with electrode H350R was around 500 - 1,200 microns. However, microstructure testing of the heat-affected zone showed that there was no crack from welding with either electrode. The microstructure consisted of ferrite mixed with a martensite structure evenly dispersed. However, in the welding with electrode H350R, the martensite structure was smoother than in the welding with E8016. This was because E8016 contained  a large amount of silicon and manganese giving it a rougher grain, directly affecting friction resistance, tensile strength and vibration. It can be concluded from the study, therefore, that the H350R welding electrode is not suitable for 100 pound/yard railway surface hardfacing welding.

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Published

2019-12-25

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Section

บทความวิจัย