| NG-GMAW | narrow-gap gas metal arc welding |
| GMAW | gas metal arc welding |
| SEM | scanning electron microscopy |
| WM | weld metal |
| HAZ | heat-affected zone |
| BM | base metal |
| OM | optical microscopy |
| DCZs | dendritic crystal zones |
| CCZsdu | columnar crystal zones |
| EDS | energy-dispersive spectrometer |
| CW | cross-weld tensile specimen |
| 1/5T | 1/5 thickness from weld surface |
| 2/5T | 2/5 thickness from weld surface |
| 3/5T | 3/5 thickness from weld surface |
| 4/5 T | 4/5 thickness from weld surface |
| M-A | martensite-austenite constituents |
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