Measurement of Diffusible Hydrogen Content in HY 80 Steel Weldments Made using Fortrex NQ1 Flux Covered Electrodes at FMF Cape Scott

Authors
  1. Veinot, D.E.
  2. Robichaud, E.J.
  3. Pelletier, G.R.
Corporate Authors
Defence R&D Canada - Atlantic, Dartmouth NS (CAN)
Abstract
This report describes use of a gas chromatographic analytical procedure to determine diffusible hydrogen in standard weld test specimens made on HY80 steel coupons using Fortrex NQ1 electrodes at Fleet Maintenance Facility Cape Scott (FMFCS). The experiments conducted here were used to validate the analytical procedure for determining diffusible hydrogen content levels in welded test pieces made under known conditions in the FMFCS submarine multifunctional services work center and to investigate the effect of varying several of the weld process controllable parameters on diffusible hydrogen content. It is expected that the most likely end use of this procedure would be to evaluate diffusible hydrogen content in coupons made by welders in the field in order to ensure that acceptable levels of diffusible hydrogen were being met in field weld operations. It was demonstrated that HY80 steel weldments could be made that consistently met the naval engineering standard for diffusible hydrogen content, by FMFCS welders using the welding procedures and consumables, namely, manual metal arc welding and Fortrex NQ1, 3.2 mm and 4 mm diameter electrodes. Further, it was shown that the most significant variable that could affect diffusible hydrogen levels was the electrode covering moisture content and as long as this was maintained below 0.25 percent acceptable diffusible hydrogen levels were achieved. In addition, levels of diffusible hydrogen in the weldments were generally lower for th

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Keywords
weldments;hydrogen;diffusible;measurement
Report Number
DRDC-ATLANTIC-TM-2003-186 — Technical Memorandum
Date of publication
01 Sep 2003
Number of Pages
30
DSTKIM No
CA047101
CANDIS No
807425
Format(s):
Electronic Document(PDF)

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