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A COMPARATIVE STUDY ON THE LASER, PLASMA AND TIG WELDING OF DUPLEX STAINLESS STEEL | ||
| AL-TAQANI | ||
| Article 1, Volume 26, Issue 2, 2013, Pages 0-0 | ||
| Author | ||
| Adnan Shamkhy Jabur | ||
| Abstract | ||
| The rule of laser, plasma, and TIG welding energy concentration, in the transformation behavior and hardness of duplex stainless steel weld metal was investigated. The significant findings were that the Nd-Yag pulsed laser welding changes the duplex ferritic-austenitic structure of fusion zone to a full ferritic structure after solidification, and increases its hardness above the average value of the duplex base metal with no evidence of HAZ. The plasma welding causes the development of dendritic duplex structure in the fusion zone and widman-statten duplex structure in the HAZ, besides reduce the hardness of welds to lower than that of laser samples. The TIG welding produce the larger duplex fusion zone and HAZ and more reduction in hardness in comparison with plasma welding. All these steep variations in structure and hardness accompanied with the three technologies mean that the three is a severe reduction in energy concentration from laser to plasma until TIG technologies. | ||
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