Journal
JOURNAL OF MANUFACTURING SCIENCE AND ENGINEERING-TRANSACTIONS OF THE ASME
Volume 135, Issue 5, Pages -Publisher
ASME
DOI: 10.1115/1.4024817
Keywords
CFD; GMAW; shielding gas coverage; nozzle geometry; side draughts
Funding
- BAE Systems Surface Ships Limited
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Three geometry changes to the inner bore of a welding nozzle and their effects on weld quality during gas metal arc welding (GMAW) were investigated through the use of computational fluid dynamic (CFD) models and experimental trials. It was shown that an increased shielding gas exit velocity increased the gas column's stability, and therefore its resistance to side draughts. Double helix geometry within the nozzle reduced the gas column's stability by generating a fast moving wall of gas around a slow moving center. A pierced internal plate initially increased the gas velocity, however, the nozzle was unable to maintain the velocity and the change produced gas columns of similar stability to a standard nozzle. A pierced end plate produced the best results, increasing the shielding gases exit velocity sufficiently to marginally outperform the standard 16 mm welding nozzle.
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