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Original Article
Effects of active gases on droplet transfer and weld morphology in pulsed-current NG-GMAW of mild steel
Xinhua Tang
Shanghai Jiao Tong University
Corresponding Author
ORCiD: https://orcid.org/0000-0002-2675-4033
License:
This work is licensed under a CC BY 4.0 License. Read Full License
The current research of narrow-gap gas metal arc welding (NG-GMAW) primarily focuses on improving the sidewall fusion and avoiding the lack-of-fusion defect. However, the high cost and operation difficulty of the methods limit the industrial application. In this study, small amount of active gases CO2 and O2 were added into pure argon inert shielding gas to improve the weld formation of pulsed-current narrow-gap gas metal arc welding (NG-GMAW) of mild steel. Their effects on droplet transfer and arc behavior were investigated. A high-speed visual sensing system was utilized to observe the metal transfer process and arc morphology. When the proportion of CO2, being added into the pure argon shielding gas, changes from 5% to 25%, the metal transfer mode changes from pulsed spray streaming transfer to pulsed projected spray transfer, while it remains the pulsed spray streaming transfer when 2% to 10% O2 is added. Both CO2 and O2 are favorable to stabilizing arc and welding process. O2 is even more effective than CO2. However, O2 is more likely to cause slags on the weld surface, while CO2 can improve the weld appearance in some sense. The weld surface concavity in NG-GMAW is greatly influenced by the addition of active gas, but the weld width and weld penetration almost keep constant. This study proposes a new method which is beneficial to improving the weld bead formation and welding process stability.
Keywords
Metal transfer, Active gases, Pulsed-current NG-GMAW, Weld morphology
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On 07 Jan, 2021
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Editorial decision: Minor revision
On 28 Dec, 2020
Review #2 received
Received 27 Jun, 2020
Reviewer #2 agreed
On 09 Jun, 2020
Review #1 received
Received 06 Jun, 2020
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On 18 May, 2020
Reviewers invited
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This preprint is under consideration at Chinese Journal of Mechanical Engineering. A preprint is a preliminary version of a manuscript that has not completed peer review at a journal. Research Square does not conduct peer review prior to posting preprints. The posting of a preprint on this server should not be interpreted as an endorsement of its validity or suitability for dissemination as established information or for guiding clinical practice.
Learn more about In Review
Original Article
Effects of active gases on droplet transfer and weld morphology in pulsed-current NG-GMAW of mild steel
Xinhua Tang
Shanghai Jiao Tong University
Corresponding Author
ORCiD: https://orcid.org/0000-0002-2675-4033
Badges
Prescreen
This manuscript passed our Prescreen assessment
Complete author information
Appropriate declaration statements
Potential risks to human health
Prescreen
Peer Review Timeline
CURRENT STATUS: Under Review
Version 2
Posted 15 Jan, 2021
No community comments so far
Editor assigned
On 07 Jan, 2021
Submission checks complete
On 07 Jan, 2021
Editor invited
On 07 Jan, 2021
No comments provided
Editorial decision: Minor revision
On 28 Dec, 2020
Review #2 received
Received 27 Jun, 2020
Reviewer #2 agreed
On 09 Jun, 2020
Review #1 received
Received 06 Jun, 2020
Reviewer #1 agreed
On 18 May, 2020
Reviewers invited
Invitations sent on 11 May, 2020
Editor assigned
On 06 May, 2020
First submitted
On 05 May, 2020
Submission checks complete
On 05 May, 2020
Editor invited
On 05 May, 2020
Metrics
Comments: 0
PDF Downloads: ...
HTML Views: ...
Subject Areas
Mechanical Engineering
License:
This work is licensed under a CC BY 4.0 License. Read Full License
The current research of narrow-gap gas metal arc welding (NG-GMAW) primarily focuses on improving the sidewall fusion and avoiding the lack-of-fusion defect. However, the high cost and operation difficulty of the methods limit the industrial application. In this study, small amount of active gases CO2 and O2 were added into pure argon inert shielding gas to improve the weld formation of pulsed-current narrow-gap gas metal arc welding (NG-GMAW) of mild steel. Their effects on droplet transfer and arc behavior were investigated. A high-speed visual sensing system was utilized to observe the metal transfer process and arc morphology. When the proportion of CO2, being added into the pure argon shielding gas, changes from 5% to 25%, the metal transfer mode changes from pulsed spray streaming transfer to pulsed projected spray transfer, while it remains the pulsed spray streaming transfer when 2% to 10% O2 is added. Both CO2 and O2 are favorable to stabilizing arc and welding process. O2 is even more effective than CO2. However, O2 is more likely to cause slags on the weld surface, while CO2 can improve the weld appearance in some sense. The weld surface concavity in NG-GMAW is greatly influenced by the addition of active gas, but the weld width and weld penetration almost keep constant. This study proposes a new method which is beneficial to improving the weld bead formation and welding process stability.
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Figure 6
Figure 7
Figure 8
Figure 9
Figure 10
Figure 11
Figure 12
Figure 13
Figure 14
Figure 15
Due to technical limitations, full-text HTML conversion of this manuscript could not be completed. However, the latest manuscript can be downloaded and accessed as a PDF.