Arc pressure and weld metal fluid flow whilst using alternating shielding gases Part 1 : arc pressure measurement

Campbell, Stuart and Galloway, Alexander and McPherson, Norman (2013) Arc pressure and weld metal fluid flow whilst using alternating shielding gases Part 1 : arc pressure measurement. Science and Technology of Welding and Joining, 18 (7). pp. 591-596. ISSN 1362-1718 (https://doi.org/10.1179/1362171813Y.0000000142)

[thumbnail of Campbell_S_et_al_Pure_ARC_pressure_and_weld_metal_fluid_flow_whilst_using_alternating_shielding_gases_Part_1.doc] Microsoft Word. Filename: Campbell_S_et_al_Pure_ARC_pressure_and_weld_metal_fluid_flow_whilst_using_alternating_shielding_gases_Part_1.doc
Preprint
Download (3MB)

Abstract

As part of an ongoing process to fully evaluate the effects of an alternating shielding gas supply on gas shielded welding processes, a comparison between the arc pressures generated using argon, helium, alternating shielding gases and pulsed GTAW has been conducted. Arc pressure variation and peaking are two of the fundamental phenomena produced during the alternating shielding gas process and are said to help create a stirring action within the liquid weld metal. However, there is no published data on arc pressure measurements during an alternating shielding gas supply and, consequently, these phenomena are based solely on theoretical assumptions. The experimental measurements made have shown that alternating shielding gases produces considerably higher arc pressures than argon, helium and pulsed GTAW due to a surge at weld initiation. The transient arc pressure measurements made when using alternating shielding gases are also considerably different from the theoretical assumptions previously reported.

ORCID iDs

Campbell, Stuart, Galloway, Alexander ORCID logoORCID: https://orcid.org/0000-0003-0143-8314 and McPherson, Norman;
CORE (COnnecting REpositories)