Heat flow and arc efficiency at high pressures in argon and helium tungsten arcs
- Thermische Verfahrenstechnik, Berlin (Germany)
For control of welding underwater robotic systems, the arc characteristics and the heat quotation in cathode, arc column and anode (weld) were measured in GTAW with argon and helium shielding gas using the calorimetric method. The measurements were performed mainly in a pressure chamber. The pressure, the current and the arc length were varied from 0.1-6.0 MPa, 50-300 A and 2-11 mm, respectively. It was observed that the welding voltage is strongly dependent on system pressure for both shielding gases and an explicit minimum voltage/current was obtained for the argon arc characteristics at approximately 100 A. Furthermore, the field strength and the heat emission from the arc column increased exponentially with the pressure. A simple relation was developed to predict heat emission from the arc column and, consequently, for the arc efficiency. In addition, a calculation model for engineering use was derived based on the Ellenbaas-Heller equation to calculate the-heat flux from the arc to the weld (for both gases).
- OSTI ID:
- 6257490
- Journal Information:
- Welding Journal (Miami); (United States), Vol. 72:9; ISSN 0043-2296
- Country of Publication:
- United States
- Language:
- English
Similar Records
Machine gas tungsten arc and machine gas metal arc welding of chromium-nickel steel. Welding procedure specification
Manual gas tungsten arc and machine gas metal arc welding of chromium-nickel steel. Welding procedure specification
Related Subjects
UNDERWATER FACILITIES
GAS TUNGSTEN-ARC WELDING
ARGON
CALORIMETRY
CONTROL
HEAT FLOW
HEAT SOURCES
HELIUM
MATHEMATICAL MODELS
PERFORMANCE
TEST FACILITIES
ARC WELDING
ELEMENTS
FABRICATION
FLUIDS
GAS METAL-ARC WELDING
GASES
JOINING
NONMETALS
RARE GASES
WELDING
360101* - Metals & Alloys- Preparation & Fabrication