Derivation of forces acting on the liquid weld metal based on arc pressure measurements produced using alternating shielding gases in the GTAW process

Stuart Campbell, Alexander Galloway, Norman McPherson

Research output: Contribution to conferencePaper

Abstract

As part of an ongoing process to fully evaluate the effects of an alternating shielding gas supply on the gas tungsten arc and gas metal arc welding processes, a comparison between arc pressures produced using argon, helium, alternating gases and GTAW-P has been conducted. The alternating shielding gas process is reported to create a dynamic stirring action within the liquid weld metal as a result of three independent phenomena: a) variation in weld pool fluidity, b) arc pressure variation, and c) arc pressure peaking. These effects have been the basis of previous advantages associated with the process, however these phenomena have not previously been verified and are based solely on theoretical assumptions. Arc pressure measurements are presented which allowed for the numerical derivation of various forces acting on the liquid weld metal in order to estimate the flow vectors present when each
shielding gas is present.
LanguageEnglish
Pages2375-2386
Number of pages12
Publication statusPublished - 4 Aug 2013
Event8th Pacific Rim International Congress on Advanced Materials and Processing - Hawaii, United States
Duration: 4 Aug 20139 Aug 2013

Conference

Conference8th Pacific Rim International Congress on Advanced Materials and Processing
CountryUnited States
CityHawaii
Period4/08/139/08/13

Fingerprint

Pressure measurement
Shielding
Welds
Gases
Metals
Liquids
Gas metal arc welding
Helium
Tungsten
Gas supply
Fluidity
Argon

Keywords

  • GTAW
  • alternating shielding gases
  • GTAW-P
  • arc pressure
  • arc forces
  • fluid flow

Cite this

Campbell, S., Galloway, A., & McPherson, N. (2013). Derivation of forces acting on the liquid weld metal based on arc pressure measurements produced using alternating shielding gases in the GTAW process. 2375-2386. Paper presented at 8th Pacific Rim International Congress on Advanced Materials and Processing, Hawaii, United States.
Campbell, Stuart ; Galloway, Alexander ; McPherson, Norman. / Derivation of forces acting on the liquid weld metal based on arc pressure measurements produced using alternating shielding gases in the GTAW process. Paper presented at 8th Pacific Rim International Congress on Advanced Materials and Processing, Hawaii, United States.12 p.
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Campbell, S, Galloway, A & McPherson, N 2013, 'Derivation of forces acting on the liquid weld metal based on arc pressure measurements produced using alternating shielding gases in the GTAW process' Paper presented at 8th Pacific Rim International Congress on Advanced Materials and Processing, Hawaii, United States, 4/08/13 - 9/08/13, pp. 2375-2386.

Derivation of forces acting on the liquid weld metal based on arc pressure measurements produced using alternating shielding gases in the GTAW process. / Campbell, Stuart; Galloway, Alexander; McPherson, Norman.

2013. 2375-2386 Paper presented at 8th Pacific Rim International Congress on Advanced Materials and Processing, Hawaii, United States.

Research output: Contribution to conferencePaper

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T1 - Derivation of forces acting on the liquid weld metal based on arc pressure measurements produced using alternating shielding gases in the GTAW process

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AB - As part of an ongoing process to fully evaluate the effects of an alternating shielding gas supply on the gas tungsten arc and gas metal arc welding processes, a comparison between arc pressures produced using argon, helium, alternating gases and GTAW-P has been conducted. The alternating shielding gas process is reported to create a dynamic stirring action within the liquid weld metal as a result of three independent phenomena: a) variation in weld pool fluidity, b) arc pressure variation, and c) arc pressure peaking. These effects have been the basis of previous advantages associated with the process, however these phenomena have not previously been verified and are based solely on theoretical assumptions. Arc pressure measurements are presented which allowed for the numerical derivation of various forces acting on the liquid weld metal in order to estimate the flow vectors present when eachshielding gas is present.

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KW - arc forces

KW - fluid flow

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Campbell S, Galloway A, McPherson N. Derivation of forces acting on the liquid weld metal based on arc pressure measurements produced using alternating shielding gases in the GTAW process. 2013. Paper presented at 8th Pacific Rim International Congress on Advanced Materials and Processing, Hawaii, United States.