Journal
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
Volume 254, Issue -, Pages 254-264Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jmatprotec.2017.11.042
Keywords
PGTAW; Alternating magnetic field; Narrow gap; Arc characteristic; Weld morphology
Funding
- National Key Research and Development Program of China [2016YFB0300602]
- National Natural Science Foundation of China [51475104, 51435004]
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The exerted alternating magnetic field periodically deflects the welding arc during the pulsed current period and acts to keep a larger proportion of the arc profile attached to the sidewall for providing more arc heat in the narrow gap condition. A combined alternating magnetic field and low frequency pulsed gas tungsten arc welding (AMF-PGTAW) can enable the distribution of arc pressure and arc energy to be reasonably allocated while protecting the both sidewalls from lack-of-fusion defect. Under the same heat input, a sound weld joint without lack-of-fusion defect can be achieved by changing the arc characteristics and AMF-PGTAW features the larger sidewall penetration and smaller weld penetration due to the uniform arc heat distribution. Microstructures of both PGTAW and AMF-PGTAW reveal the significant microstructural refinement of AMF-PGTAW welds for the same heat input.
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