The primary purpose of this study was to determine the range of welding variables for which the weld HAZ sensitization resistance of wrought austenitic stainless steels will not be reduced to an unacceptable level. In addition, a comparison of weld HAZ sensitization behavior of the recently proposed BWR alternate alloys (304LN, modified 347 and 316NG) with the standard AISI 304 and 347 alloys was also conducted. A comparison of the three new electrochemical methods (EPR, JEPR and constant potential etch test in perchloric acid) with the conventional ASTM A262 practice A for detecting sensitization is included in this study. To accomplish precise determination of HAZ sensitization, a rapid and accurate method of HAZ profiling combined with a bead-on-edge weld method, was developed. The results of the HAZ profiling technique were compared with the Gleeble HAZ simulation technique and field welded assemblies. Both the EPR and ASTM A262A (oxalic acid etch) tests were utilized to measure the degree of sensitization of the actual weld HAZ and the Gleeble simulated HAZ. Optical and scanning electron microscopy were employed to correlate the measured degree of sensitization with microstructure.
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| Number of Pages : | 81 |
| Published : | 1986 |
