Implant test and acoustic emission technique used to investigate hydrogen assisted cracking in the melted zone of a welded HSLA-80 steel

Authors

  • H. C. Fals Universidad de Oriente. Facultad de Eng. Mecánicas
  • R. E. Trevisan Universidade Estadual de Campiñas

DOI:

https://doi.org/10.3989/revmetalm.1999.v35.i4.629

Keywords:

Microalloy steel, Welding, Hydrogen assisted cracking, Fracture modes, Acoustic emission

Abstract


Weld metal hydrogen assisted cracking was studied using two flux cored wire (AWS E 70T-5 and AWS E 120 T5-K4) and a mixture gas of CO2 + 5% H2 to induce high values of diffusible hydrogen in high strength low alloy steel (HSLA-80) weldments. An Acoustical Emission Measurement System (AEMS) RMS voltmeter was coupled to the implant test (NF 89-100) apparatus to determine energy, amplitude and event numbers of signal. All cracks were initiated in the partially melted zone and propagated into the coarse-grained region of the heat affected zone when E 70 T5 consumable was used, and the quasi-cleavage fracture mode was predominant. When E 120 T5 K4 consumable was used the cracks propagated vertically across the fusion zone, and a mixed fracture mode was the most important. A significant relationship between acoustic emission parameters and fracture modes was found.

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Published

1999-08-30

How to Cite

Fals, H. C., & Trevisan, R. E. (1999). Implant test and acoustic emission technique used to investigate hydrogen assisted cracking in the melted zone of a welded HSLA-80 steel. Revista De Metalurgia, 35(4), 233–241. https://doi.org/10.3989/revmetalm.1999.v35.i4.629

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Section

Articles